{"title":"Audio Amplifiers","description":"","products":[{"product_id":"3w-stereo-audio-amplifier-using-tda7266d","title":"3W Stereo Audio Amplifier using TDA7266D","description":"\u003cp\u003eTiny stereo audio amplifier board has been designed around SMD TDA7266D IC from ST. The TDA7266D is a dual bridge amplifier specially designed for Portable Audio, LCD TV\/Monitor, PC Motherboard, and TV applications. This circuit provides high quality audio output of 3W approx. on each channel with standard audio signal input. The circuit works with 3.5V to 5V. Due to low supply input this amplifier is suitable for small size audio gadgets and portable audio applications like MP3 player, Voice messaging system, Warning signals, Annunciator etc.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupply voltage range 3.5 to 5v (maximum supply 5v due to small pcb and small thermal area)\u003c\/li\u003e\n\u003cli\u003eOutput power 3+3w @thd = 10%, rl = 8ω, vcc = 3.7v (3w approx.)\u003c\/li\u003e\n\u003cli\u003eSingle supply\u003c\/li\u003e\n\u003cli\u003eMinimum external components no svr capacitor no bootstrap no boucherot cells internally fixed gain\u003c\/li\u003e\n\u003cli\u003eMute functions (jumper close)\u003c\/li\u003e\n\u003cli\u003eShort circuit protection\u003c\/li\u003e\n\u003cli\u003eThermal overload protection\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47036222374060,"sku":"A101","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A101A.jpg?v=1787561679"},{"product_id":"hi-efficient-20w-mono-class-d-audio-amplifier","title":"Hi-Efficient 20W Mono Class-D Audio Amplifier","description":"\u003cp\u003eThis is a Hi-Efficient 20W mono Class-D audio amplifier, designed to drive speakers as low as 4 ohms in a bridge-tied-load configuration. Due to the low power dissipation and high efficiency of up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e90%\u003c\/strong\u003e, the module doesn’t require a heatsink. The project is built using\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePAM8320\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip which features short circuit protection, thermal shutdown, over-voltage protection and under-voltage lock-out. Ferrite-Bead is provided on the output of the speaker connection to eliminate EMI. Connect SD to a high and MUTE to a low for normal operation.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperates from 4.5V to 15V\u003c\/li\u003e\n\u003cli\u003e20W into 4Ω BTL Load from 12V Supply\u003c\/li\u003e\n\u003cli\u003eSingle-Ended Analog Input\u003c\/li\u003e\n\u003cli\u003eNo Pop Noise for Start-up and Shut-down Sequences\u003c\/li\u003e\n\u003cli\u003eOutput Power at 1% THD+N (1Khz) @ 15W Output\u003c\/li\u003e\n\u003cli\u003eInternal Oscillator (No External Components Required)\u003c\/li\u003e\n\u003cli\u003eHighly Efficient Class-D Operation Eliminates Need for Heat Sinks\u003c\/li\u003e\n\u003cli\u003eThermal and Short-Circuit Protection with Auto Recovery\u003c\/li\u003e\n\u003cli\u003eOver Voltage Protection and Under Voltage Lock-out\u003c\/li\u003e\n\u003cli\u003eScrew Terminal for Speak and Power Connections\u003c\/li\u003e\n\u003cli\u003eOn Board Trimmer Potentiometer for Volume Control\u003c\/li\u003e\n\u003cli\u003eOn Board Jumpers for Shutdown and Mute Functions\u003c\/li\u003e\n\u003cli\u003eOn Board Power LED\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Audio Input\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 39.53 x 33.97 mm\u003c\/li\u003e\n\u003cli\u003e2 x 3 mm PCB Mounting Holes\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47036728967340,"sku":"A108","price":9.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A108A.jpg?v=1787566643"},{"product_id":"dual-105mw-headphone-amplifier-with-digital-volume-control-and-shutdown-mode","title":"Dual 105mW Headphone Amplifier with Digital Volume Control and Shutdown Mode","description":"\u003cp\u003eThis is a low noise\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eHeadphone Amplifier\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecapable of delivering\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e105mW\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eper channel of continuous average power into a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e16Ω load\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e0.1% (THD+N)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efrom a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e5V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003epower supply. The project is based on the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eLM4811\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip from the boomer series. The board provides high-quality output power with a minimal number of external components. It features a digital volume control that sets the amplifier’s gain from\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e+12dB to −33dB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ein 16 discrete steps using a two−wire interface or onboard 3 tactile switches. On-board jumper implements the shutdown feature. The chip also has an internal thermal shutdown protection mechanism.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConnector CN1 Audio Input\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003ePin 1 Audio Signal Input 1\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePin 2 GND\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePin 3 GND\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePin 4 Audio Signal Input 2\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eConnector CN3 Power Supply\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003ePin 1 +5V DC Input\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePin 2 GND\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eOthers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector LS1 and LS2:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eOptional Speaker or Headphone Connection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector CN4:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e3.5MM Stereo EP Female socket for Headphone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector CN2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eExternal\/Optional 2 Wire Gain Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJumper J1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCloses = Enable, J1 Open Shutdown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED D1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePower LED\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eClock Input, Increment Steps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVolume Down Operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch 3:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVolume Up Operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Power Supply 5V DC\u003c\/li\u003e\n\u003cli\u003eOutput 105mW Stereo\u003c\/li\u003e\n\u003cli\u003eOn-Board Power LED\u003c\/li\u003e\n\u003cli\u003eDigital Volume Control Range from +12dB to −33dB\u003c\/li\u003e\n\u003cli\u003e“Click and Pop” Suppression Circuitry\u003c\/li\u003e\n\u003cli\u003eTHD+N at 1kHz, 105mW Continuous Average Output Power into 16Ω 0.1 % (typ)\u003c\/li\u003e\n\u003cli\u003eTHD+N at 1kHz, 70mW Continuous Average Power into 32Ω 0.1 % (typ)\u003c\/li\u003e\n\u003cli\u003eLow Shutdown Current\u003c\/li\u003e\n\u003cli\u003e3 Tactile Switches to set the Gain\u003c\/li\u003e\n\u003cli\u003eOptional 3 Pin Header Connector for 2 Wire Interface for Micro-Controller for Gain\u003c\/li\u003e\n\u003cli\u003eOn-Board Stereo EP Socket for Easy Headphone Interface\u003c\/li\u003e\n\u003cli\u003eOptional 2 x Header Connector for Headphone\/Speaker Connections\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Power Supply\u003c\/li\u003e\n\u003cli\u003eJumper for Shutdown\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 39.21 x 37.47 mm\u003c\/li\u003e\n\u003cli\u003e4 x 2.5MM Mounting Holes\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47036760490156,"sku":"A109","price":12.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A109A.jpg?v=1787567009"},{"product_id":"2-5w-stereo-audio-amplifier-using-lm4752","title":"2.5W Stereo Audio Amplifier using LM4752","description":"\u003cp\u003eThe Stereo Audio Amplifier project shown here is capable of delivering\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2.5W\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eper channel of continuous average output power to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4Ω loads\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eusing a single\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e12V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esupply at\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e10% THD+N\u003c\/strong\u003e. The project is built using the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eLM4752\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip. This chip is specifically designed for single supply operations and low external components count. The gain and bias resistors are integrated on-chip, resulting in a 2.5W stereo amplifier in a compact 7-pin\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTO263\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSMD package. High output power levels at 12V supplies and low external component count offer high value for compact stereo and TV applications. Sufficient power dissipation is provided on PCB so no external heatsink is required for IC.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSupply 12V-16V DC\u003c\/li\u003e\n\u003cli\u003ePO 2.5W Stereo at 10% THD+N @ 1 kHz into 4Ω\u003c\/li\u003e\n\u003cli\u003eDrives 4Ω and 8Ω Loads\u003c\/li\u003e\n\u003cli\u003eInternal Gain Resistors (AV = 34 dB)\u003c\/li\u003e\n\u003cli\u003eMinimum External Component\u003c\/li\u003e\n\u003cli\u003eSingle Supply Operation\u003c\/li\u003e\n\u003cli\u003eInternal Current Limiting\u003c\/li\u003e\n\u003cli\u003eInternal Thermal Protection\u003c\/li\u003e\n\u003cli\u003eOn-Board Power LED\u003c\/li\u003e\n\u003cli\u003eOn-Board Trimmer Potentiometer for Volume Control\u003c\/li\u003e\n\u003cli\u003eScrew Terminal for Power Supply\u003c\/li\u003e\n\u003cli\u003eScrew Terminal for Speaker Connections\u003c\/li\u003e\n\u003cli\u003e3 Pin Male Header for Audio Signal Input\u003c\/li\u003e\n\u003cli\u003eOn-Board Thermal Area for Power Dissipation\u003c\/li\u003e\n\u003cli\u003e4 x 3 mm Mounting Holes\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 75.72 x 89.99mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCN1: Pin 1 VCC, Pin 2 GND\u003c\/li\u003e\n\u003cli\u003eCN2: Audio Signal Input Channel B\u003c\/li\u003e\n\u003cli\u003eCN3: Audio Signal Input Channel A\u003c\/li\u003e\n\u003cli\u003eCN4: Speaker Channel B\u003c\/li\u003e\n\u003cli\u003eCN5: Speaker Channel A\u003c\/li\u003e\n\u003cli\u003ePR1: Trimmer Potentiometer for Channel B Audio Volume Control\u003c\/li\u003e\n\u003cli\u003ePR2: Trimmer Potentiometer for Channel A Audio Volume Control\u003c\/li\u003e\n\u003cli\u003eD1 Power LED\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47036782870700,"sku":"A110","price":27.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A110A.jpg?v=1787567341"},{"product_id":"mono-2w-switch-mode-class-d-audio-power-amplifier","title":"Mono 2W – Switch-Mode (Class D) Audio Power Amplifier","description":"\u003cp\u003eThis is a compact size, mono, switch-mode (Class-D) audio power amplifier intended for multimedia and general-purpose high-power applications. It has greater than\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e87% efficiency\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand is capable of delivering\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2W\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emaximum continuous power to a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4Ω load\u003c\/strong\u003e. The project is designed to be driven by the line-out or headphone jack of a CD\/MP3 player or to be directly connected to any audio source. The project includes header connectors for speakers, power supply, and audio input for quick connection. The project also has 3x jumpers for frequency selection and shutdown action. The project is built using the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMAX4295\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUndervoltage Lockout\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAt low supply voltages, the MOSFETs in the H-bridge may have inadequate gate drive thus dissipating excessive power. The Undervoltage lockout circuit prevents the device from operating at supply voltages below\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e+2.2V\u003csub\u003edc\u003c\/sub\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLow-Power Shutdown Mode (Jumper J3 for Shutdown)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe MAX4295 has a shutdown mode that reduces power consumption and extends battery life. Driving\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSHDN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003elow disables the H-bridge, turns off the circuit, and places the MAX4295 in a low-power shutdown mode. Connect SHDN to VCC using jumper 3 for normal operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequency Selection (Jumper J1 and J2 For Frequency Selection)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe MAX4295 has an internal logic-programmable oscillator controlled by FS1 and FS2 (see table below). The oscillator can be programmed to frequencies of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e125kHz, 250kHz, 500kHz,\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1MHz.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe working frequency should be chosen to best fit the user application. As a rule of thumb, choose\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ef\u003csub\u003eOSC\u003c\/sub\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto be 10x times the audio bandwidth. A lower switching frequency offers higher amplifier efficiency and lower THD but requires larger external filter components. A higher switching frequency reduces the size and cost of the filter components at the expense of THD and efficiency. In most applications, the optimal f\u003csub\u003eOSC\u003c\/sub\u003e\u003cspan\u003e \u003c\/span\u003eis\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e250kHz.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eConnections and Other Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCN1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePin 1 and Pin 2 = VCC, Pin and Pin 4 = GND (VCC Supply 2.7V to 5.5V DC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLS1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePin 1 and Pin 2 = Speaker 1, Pin 3 and Pin 4 = Speaker 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCN2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePin 2 Audio Signal Input, Pin 1 GND\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJumpers J1 and J2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFrequency select pins FS1 and FS2. See Table for the shunt positions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJumper J3:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eShutdown selection, GND= Shutdown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eD1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePower LED\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Power Supply +2.7V to +5.5V Input Range (1.5A)\u003c\/li\u003e\n\u003cli\u003e2W Channel Output Power at 5V\u003c\/li\u003e\n\u003cli\u003e7W\/Channel Output Power at 3V\u003c\/li\u003e\n\u003cli\u003e87% Efficiency (RL = 4Ω, POUT = 2W)\u003c\/li\u003e\n\u003cli\u003eProgrammable PWM Oscillator Frequency Selection (125kHz, 250kHz, 500kHz, 1MHz)\u003c\/li\u003e\n\u003cli\u003eLow 0.4% THD+N (RL = 4Ω, fIN = 1kHz, fOSC = 250kHz)\u003c\/li\u003e\n\u003cli\u003eLow-Power Shutdown Mode\u003c\/li\u003e\n\u003cli\u003e1A Current Limit and Thermal Protection\u003c\/li\u003e\n\u003cli\u003eClick fewer Transitions into and Out of Shutdown\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 31.59 x 28.42 mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47036806004908,"sku":"A111","price":12.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A111A.jpg?v=1787567635"},{"product_id":"low-cost-voltage-3w-class-d-stereo-audio-amplifier-for-portable-gadgets","title":"Low Cost\/Voltage 3W Class-D Stereo Audio Amplifier for Portable Gadgets","description":"\u003cp\u003eThis low cost low voltage 3W class-D stereo amplifier is based on PAM8403 IC, The PAM8403 is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction. The new filter-less architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and PCB area. With the same numbers of external components, the efficiency of the PAM8403 is much better than that of Class-AB cousins. It can extend the battery life, which makes it well-suited for portable applications. Trimmer Potentiometer helps to adjust the volume control, CN1 provided to feed the audio signal, CN2 power supply, Mute and shutdown in, LS1 and LS2 to connect the speaker. Shutdown and Mute pin required high level signal input, and can be connect to VDD power pins for normal operation, can be connect to GND for shutdown or mute the audio. The amplifier works well with standard audio signal input.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSupply 3.6V 5V DC\u003c\/li\u003e\n\u003cli\u003e3W Output at 10% THD with a 4Ω Load and 5V Power Supply\u003c\/li\u003e\n\u003cli\u003eFilter less, Low Quiescent Current and Low EMI\u003c\/li\u003e\n\u003cli\u003eOn Board Trimmer potentiometer to Adjust The Volume\u003c\/li\u003e\n\u003cli\u003eLow THD+N\u003c\/li\u003e\n\u003cli\u003eVery Small Size Board\u003c\/li\u003e\n\u003cli\u003eSuperior Low Noise\u003c\/li\u003e\n\u003cli\u003eEfficiency up to 90%\u003c\/li\u003e\n\u003cli\u003eShort Circuit Protection\u003c\/li\u003e\n\u003cli\u003eThermal Shutdown\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47037167468716,"sku":"A113","price":6.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A113A.jpg?v=1787568858"},{"product_id":"stereo-audio-processor-for-home-tv-audio","title":"Stereo Audio Processor for Home TV Audio","description":"\u003cp\u003eThis\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePT2315E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIC-based audio processor is designed for versatile applications and includes master volume control with low-frequency loudness compensation, speaker output attenuator, and tone control. It is a good solution for home audio signal processing. Due to the high-reliability requirement from the audio business, the PT2315E improves both audio performances and input surge current capability and these cause the PT2315E to be the best solution for the cost-effective audio systems.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower Supply 5V DC (Range 4V to 10V)\u003c\/li\u003e\n\u003cli\u003eMaster volume from 0 dB to -78.75dB in 1.25dB\/step\u003c\/li\u003e\n\u003cli\u003eSpeaker attenuator for balance ranges from 0dB to -38.75dB in 1.25dB\/step\u003c\/li\u003e\n\u003cli\u003eEach channel output can be muted individually.\u003c\/li\u003e\n\u003cli\u003eLow-frequency loudness compensation\u003c\/li\u003e\n\u003cli\u003eAll Controls using I2C Interface\u003c\/li\u003e\n\u003cli\u003eBass and Treble control, range from -14dB to +14dB in 2dB\/step\u003c\/li\u003e\n\u003cli\u003eLow harmonic distortion, low noise\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 51.12 x 27.78 mm\u003c\/li\u003e\n\u003cli\u003e4 x 2.5 mm Mounting Holes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnections and Other Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCN1: 3.5MM Stereo EP Female Socket Audio Input\u003c\/li\u003e\n\u003cli\u003eCN2: Pin 1 = VDD, Pin 2 – SCL, Pin 3 = SDA, Pin 4 = GND (I2C)\u003c\/li\u003e\n\u003cli\u003eCN3: 3.5MM Stereo EP Female Socket Audio Input\u003c\/li\u003e\n\u003cli\u003eCN4: Optional Audio Output Header Connector Pin1 = GND, Pin 2 = Audio Output Left Chnl, Pin 3 = Audio Output Right Chnl\u003c\/li\u003e\n\u003cli\u003eCN5: Optional Audio Output Header Connector Pin1 = Audio Input Right Chnl, Pin 2 = Audio Input Left Chnl, Pin 3 = GND\u003c\/li\u003e\n\u003cli\u003eD1: Power LED\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47037499474092,"sku":"A117","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A117A.jpg?v=1787572102"},{"product_id":"stereo-volume-and-balance-control-with-rotary-encoder-using-max5440","title":"Stereo volume and balance control with Rotary Encoder using MAX5440","description":"\u003cp\u003eThe project described here is a compact stereo volume and balance control with rotary encoder. It provides 32 log potentiometer steps with buffered wiper output. The project can easily replace mechanical potentiometer. 5 LEDs indicate the volume level or balance settings , depending on the status of the mode indicator D1 LED. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMAX5440\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eincludes debounced pushbutton inputs for mute and mode. The mute input allows a single pushbutton to change between volume control and the -90dB (typ) mute setting. The mode input toggles between volume and balance control. A click-and-pop suppression feature minimizes the audible noise generated by wiper transitions.\u003c\/p\u003e\n\u003ch3\u003eMAX5440 Description\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMAX5440\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edual, 40kΩ logarithmic taper volume control features a debounced up\/down interface for use with a simple rotary encoder without using a microcontroller (µC). Each potentiometer has 32 log-spaced tap points with a buffered wiper output and replaces mechanical potentiometers. An integrated bias generator provides the required ((VDD + VSS) \/ 2) bias voltage, eliminating the need for costly external op-amp circuits in unipolar audio applications. A mode-indicator LED output specifies volume or balance control. Five integrated LED drivers indicate volume level or balance settings, depending on the status of the mode indicator.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLogarithmic Taper Volume Control with (31) 2dB Steps\u003c\/li\u003e\n\u003cli\u003eLow-Power Wiper Buffers Provide 0.003% THD\u003c\/li\u003e\n\u003cli\u003eSingle +2.7V to +5.5V Supply Voltage Operation\u003c\/li\u003e\n\u003cli\u003eLow 0.5µA Shutdown Supply Current\u003c\/li\u003e\n\u003cli\u003eIntegrated Bias Voltage Generator\u003c\/li\u003e\n\u003cli\u003eFive-Segment LED Volume\/Balance Indicator\u003c\/li\u003e\n\u003cli\u003eClick less Switching\u003c\/li\u003e\n\u003cli\u003e40kΩ End-to-End Fixed Resistance Value\u003c\/li\u003e\n\u003cli\u003eMute Function Toggles to -90dB (typ)\u003c\/li\u003e\n\u003cli\u003ePower-On Reset to -12dBFS Wiper Position\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47037532209324,"sku":"A118","price":28.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A118A.jpg?v=1787572991"},{"product_id":"4-x-45w-quad-bridge-audio-amplifier","title":"4 x 45W Quad Bridge Audio Amplifier","description":"\u003cp\u003eThis is an AB class audio amplifier based on the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTDA7388\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip and it is a great choice for car audio applications. This compact board has 4 channels each\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e26W\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4 ohms\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003espeaker. Then IC consists of a fully complementary PNP\/NPN configuration and the TDA7388 allows a rail-to-rail output voltage swing with no need for bootstrap capacitors. The extremely reduced boundary components count allows very compact sets. The TDA7388’s inputs are ground-compatible and can stand very high input signals (±8 Vpk) without any performance degradation. The standard value for the input capacitors (0.1 µF) is adopted, and the low-frequency cut-off amount to 16 Hz. 4 x 3.5 mm stereo EP socket helps to feed audio signals, and the onboard screw terminal makes life easy for speaker connections, and the power supply input. Onboard jumpers are provided to select the standby and mute function. D1 indicates power present. Mounting a proper heatsink is very important for chip health.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower Supply 12V DC to 15V DC\u003c\/li\u003e\n\u003cli\u003e4 x 45 W \/ 4 Ω max.\u003c\/li\u003e\n\u003cli\u003e4 x 26 W \/ 4 Ω @ 14.4 V, 1 kHz, 10 %\u003c\/li\u003e\n\u003cli\u003eLow distortion\u003c\/li\u003e\n\u003cli\u003eLow output noise\u003c\/li\u003e\n\u003cli\u003eFrequency Response 20Hz to 20 Khz\u003c\/li\u003e\n\u003cli\u003eStandby function – On Board Jumper\u003c\/li\u003e\n\u003cli\u003eMute function – On Board Jumper\u003c\/li\u003e\n\u003cli\u003eAutomate at min. supply voltage detection\u003c\/li\u003e\n\u003cli\u003eLow external component count:\u003c\/li\u003e\n\u003cli\u003eInternally fixed gain (26 dB)\u003c\/li\u003e\n\u003cli\u003eNo external compensation\u003c\/li\u003e\n\u003cli\u003eNo bootstrap capacitors\u003c\/li\u003e\n\u003cli\u003eStandby Current 100uA (Chip)\u003c\/li\u003e\n\u003cli\u003e4 x 3 mm Mounting Holes\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 73.82 x 55.09 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProtections\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutput short circuit to GND, to VCC, across the load\u003c\/li\u003e\n\u003cli\u003eVery inductive loads\u003c\/li\u003e\n\u003cli\u003eOverrating chip temperature with soft thermal limiter\u003c\/li\u003e\n\u003cli\u003eLoad dump voltage\u003c\/li\u003e\n\u003cli\u003eFortuitous open GND\u003c\/li\u003e\n\u003cli\u003eReversed battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnections and Other Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCN1: DC Supply Input Pin1 = VCC, Pin2 GND\u003c\/li\u003e\n\u003cli\u003eCN2: Speaker 4, CN3: Speaker 3, CN7: Speaker 1, CN9: Speaker 2\u003c\/li\u003e\n\u003cli\u003eCN4: Audio Signal Input 3\u003c\/li\u003e\n\u003cli\u003eCN5: Audio Signal Input 4\u003c\/li\u003e\n\u003cli\u003eCN6: Audio Signal Input 2\u003c\/li\u003e\n\u003cli\u003eCN8: Audio Signal Input 1\u003c\/li\u003e\n\u003cli\u003eD1 Power LED\u003c\/li\u003e\n\u003cli\u003eJumper J2: Standby (GND Standby)\u003c\/li\u003e\n\u003cli\u003eJumper J1: Mute (GND Mute)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47037869260972,"sku":"A121","price":22.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A121A.jpg?v=1787574340"},{"product_id":"5-w-5-w-dual-btl-class-d-audio-amplifier","title":"5 W + 5 W Dual BTL Class-D Audio Amplifier","description":"\u003cp\u003eThe product described here is a high-efficiency dual BTL\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eclass-D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eaudio amplifier with single supply operations. The project was built using\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTDA7491LP13TR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efrom ST. The low profile PCB design can fit in a small area, operating power supply\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e9-12V DC\u003c\/strong\u003e, Project supports single-ended or differential audio signal inputs. Jumpers are provided to set the various gains, standby, and mute functions.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e5W + 5W Continuous Output Power, 10% THD, (8 Ohms Speaker) at 9V DC\u003c\/li\u003e\n\u003cli\u003eSingle Supply Operation 9V to 12V\u003c\/li\u003e\n\u003cli\u003eFour Selectable Fixed Gains Settings of nominally 20dB, 26dB, 30dB, 32dB Using Jumpers\u003c\/li\u003e\n\u003cli\u003eDifferential Inputs Minimize Common-Mode Noise\u003c\/li\u003e\n\u003cli\u003eJumper for Single-Ended Inputs\u003c\/li\u003e\n\u003cli\u003eNo “Pop” Sound at Turn-On\/Off\u003c\/li\u003e\n\u003cli\u003eThermal Over Load Protection\u003c\/li\u003e\n\u003cli\u003eStandby and Mute Features Using Jumpers\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 63.25 x 32.39 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMode Selection\u003c\/h3\u003e\n\u003cp\u003eThere are three operating modes defined bellow:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandby mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eall circuits are turned off, very low current consumption\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMute mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003einputs are connected to the ground and the positive and negative PWM outputs are at 50% duty cycle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlay mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ethe amplifiers are active\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eJumper Setting Standby, Mute and Play Mod\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e(Low=GND, High=3.3V)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandby Mode:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eJumper J2 =Low, Jumper J1 (Don’t Care Whether low or high)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMute Mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eJumper J2=High, Jumper J1 Low\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlay Mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eJumper J2 = High, Jumper J1 High\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAudio Signal Input (Single-Ended or Differential)\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eDifferential audio signal can be feed directly to CN1 , PIN 1 to 4\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePin 1 \u0026gt;\u0026gt; IA +Input A Channel, Pin 2\u0026gt;\u0026gt; AN -Input A Channel\u003c\/li\u003e\n\u003cli\u003ePin 3 \u0026gt;\u0026gt; NB +Input B Channel, Pin 4\u0026gt;\u0026gt; BN -Input B Channel\u003c\/li\u003e\n\u003cli\u003eFor Single Ended Input Solder Jumper J5 and J6 (Channel A Input Pin1 Signal and Pin 2 GND, Channel B Pin3 Signal and Pin 4 GND)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGain Setting (PCB Solder Jumper J3 and J4)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe gain of the TDA7491LP is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin 31). Internally, the gain is set by changing the feedback resistors of the amplifier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eJ3\u0026gt;\u0026gt;Low, J4\u0026gt;\u0026gt;Low =20dB (High=3.3V, Low=GND)\u003c\/li\u003e\n\u003cli\u003eJ3\u0026gt;\u0026gt;Low, J4\u0026gt;\u0026gt;High =26dB (High=3.3V, Low=GND)\u003c\/li\u003e\n\u003cli\u003eJ3\u0026gt;\u0026gt;High, J4\u0026gt;\u0026gt;Low =30dB (High=3.3V, Low=GND)\u003c\/li\u003e\n\u003cli\u003eJ3\u0026gt;\u0026gt;High, J4\u0026gt;\u0026gt;High =32dB (High=3.3V, Low=GND)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47241950822572,"sku":"A135","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A135A.jpg?v=1789718665"},{"product_id":"dual-40w-audio-power-amplifier-with-mute","title":"Dual 40W Audio Power Amplifier with Mute","description":"\u003cp\u003eThe stereo audio amplifier project shown here is capable of delivering typically\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e40W\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eper channel continuous average output power into an\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e8Ω\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eload with less than\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e0.1% (THD+N)\u003c\/strong\u003e. The project is built using an\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eLM4766\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip from Texas Instruments, The performance of the LM4766, utilizing its Self-Peak Instantaneous Temperature (°Ke) (Spike) Protection Circuitry, places it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA). Spike Protection means that these parts are safeguarded at the output against overvoltage, undervoltage, overloads, including thermal runaway and instantaneous temperature peaks. Each amplifier within the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eLM4766\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ehas an independent smooth transition fade-in\/out mute that minimizes output pops. The IC’s extremely low noise floor at\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2µV\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand its extremely low THD+N value of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0.06%\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eat the rated power make the LM4766 optimum for high-end stereo TVs or mini-component systems.\u003c\/p\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInductor L1 and L2:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eL1 and L2 Inductors: wind 20 turns around resistors R13 and R14 with 1 mm Enameled Copper Wire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeatsink:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eIt is advisable to use a large-size heatsink with a fan for IC, refer to the datasheet of LM4066 for heatsink calculation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume Control – Potentiometer:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eUse Shielded wire for a 10K potentiometer to avoid unusual noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eScrew Terminal Connector LS1: Speaker Connection Left Channel\u003c\/li\u003e\n\u003cli\u003eScrew Terminal Connector LS2: Speaker Connection Right Channel\u003c\/li\u003e\n\u003cli\u003eScrew Terminal CN6: Power Supply Input Maximum Dual 32V DC (+\/-32V DC)\u003c\/li\u003e\n\u003cli\u003eScrew Terminal CN2: Audio Signal Input Left\u003c\/li\u003e\n\u003cli\u003eScrew Terminal CN4: Audio Signal Input Right Channel\u003c\/li\u003e\n\u003cli\u003e3 Pin Header Connector CN1: 10K Ohms Trimmer Potentiometer – Volume Control Left Channel\u003c\/li\u003e\n\u003cli\u003e3 Pin Header Connector CN5: 10K Ohms Trimmer Potentiometer – Volume Control Right Channel\u003c\/li\u003e\n\u003cli\u003eSwitch 2 Slide Switch: Mute Function\u003c\/li\u003e\n\u003cli\u003eLED1 and LED 2: Power LEDs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower Supply +\/-30V DC for 40W Output, Power Supply Range Dual 10V to 32V DC (+\/-10V to +\/-32V) @ 4Amps\u003c\/li\u003e\n\u003cli\u003eLoad 8 Ohms Speaker\u003c\/li\u003e\n\u003cli\u003eQuiet Fade-In\/Out Mute Switch\u003c\/li\u003e\n\u003cli\u003eTHD+N at 1kHz at 2 x 40W Continuous Average Output Power Into 8Ω 0.1% (Max)\u003c\/li\u003e\n\u003cli\u003eFrequency Response 20 to 20Khz\u003c\/li\u003e\n\u003cli\u003eInput Level Signal 1V Peak to Peak\u003c\/li\u003e\n\u003cli\u003eInput Impedance 47K Ohms\u003c\/li\u003e\n\u003cli\u003eGain 21\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 93.35 x 81.92 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMute Function\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlide Switch 2 is provided to apply mute operations. The muting function of the LM4766 allows the user to mute the music going into the amplifier by drawing more than 0.5mA out of each mute pin on the device.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUNDER-VOLTAGE PROTECTION\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUpon system power-up, the under-voltage protection circuitry allows the power supplies and their corresponding capacitors to come up close to their full values before turning on the LM4766 such that no DC output spikes occur. Upon turn-off, the output of the LM4766 is brought to the ground before the power supplies such that no transients occur at power-down.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOVER-VOLTAGE PROTECTION\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe LM4766 contains over-voltage protection circuitry that limits the output current to approximately 4.0A\u003csub\u003ePK\u003c\/sub\u003e\u003cspan\u003e \u003c\/span\u003ewhile also providing voltage clamping, though not through internal clamping diodes. The clamping effect is quite the same, however, the output transistors are designed to work alternately by sinking large current spikes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTHERMAL PROTECTION\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe LM4766 has a sophisticated thermal protection scheme to prevent long-term thermal stress of the device. When the temperature on the die reaches 165°C, the LM4766 shuts down. It starts operating again when the die temperature drops to about 155°C, but if the temperature again begins to rise, the shutdown will occur again at 165°C. Therefore, the device is allowed to heat up to a relatively high temperature if the fault condition is temporary, but a sustained fault will cause the device to cycle in a Schmitt Trigger fashion between the thermal shutdown temperature limits of 165°C and 155°C. This greatly reduces the stress imposed on the IC by thermal cycling, which in turn improves its reliability under sustained fault conditions. Since the die temperature is directly dependent upon the heat sink used, the heat sink should be chosen such that thermal shutdown will not be reached during normal operation. Using the best heat sink possible within the cost and space constraints of the system will improve the long-term reliability of any power semiconductor device.\u003c\/p\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47242086056108,"sku":"A136","price":48.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A136A.jpg?v=1789720407"},{"product_id":"a-dual-38w-power-amplifier-a-compact-sta540-based-stereo-audio-board","title":"A Dual 38W Power Amplifier: A Compact STA540-Based Stereo Audio Board","description":"\u003cdiv\u003e\u003cspan\u003eThis is  a compact dual-channel power amplifier module that delivers 38 W per channel into 4-ohm speakers using STMicroelectronics' STA540 audio amplifier IC.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eThe design does not require a bootstrap capacitor or a Boucherot network, which keeps the external parts count low. An internally fixed gain of 20 dB sets the amplification stage without external gain-setting resistors. A standby function also lets the board be powered down into a low-current state without removing the main supply.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003ePower, audio, and speaker connections are all made through screw terminals, so the board can be wired into an enclosure without soldering. A power LED (D1) driven from the supply rail confirms that VCC is present. The STA540 itself includes a set of protection and diagnostic features: a clip detector, short-circuit detection at turn-on, a thermal shutdown warning, and AC\/DC output short-circuit protection. Figure 1 shows the assembled board.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eSpecs and Features\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eSupply voltage: 18 V DC (22 V DC for 8-ohm loads)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eLoad impedance: 4 ohms (2 channels)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eKey IC: STA540, 4-channel Class-AB audio power amplifier\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eFixed internal gain: 20 dB, no external gain-setting network required\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eTHD: 10% at 1 kHz\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eShort-circuit output current: 4 A\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eAC\/DC output short-circuit protection\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eSoft short-circuit check at turn-on\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eThermal cutoff \/ limiter to prevent chip overheating\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eCMOS-compatible standby function, no audible pop on standby transitions\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003ePCB dimensions: 53.34 mm x 38.10 mm\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003ePCB mounting holes: 4 x 4 mm\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eHow It Works\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eThe STA540 is a 4-channel, Class-AB audio amplifier built around four internal operational amplifier stages (A1 through A4), each driving one of the IC's four outputs. On this board the four internal channels are paired to form two bridged, single-ended output pairs (OUT1\/OUT2 and OUT3\/OUT4), each feeding one of the two speaker terminals, LS1 and LS2. Audio is applied differentially through IN1\/IN2 and IN3\/IN4. These inputs are coupled through the 470 nF film capacitors C3 and C6 from the CN2 and CN4 input headers.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eThe standby pin (ST-BY) is pulled through R1 and switched through CN3. This lets an external 5 V signal put the amplifier into a low-power state without disconnecting VCC. Because the STA540 needs no external bootstrap or Boucherot components to drive its outputs, only a few parts remain: C1, C2, C4, C5, and the LED current-limiting resistor R2. Together, these support supply filtering, soft-start, and the power-present indicator.\u003c\/span\u003e\u003c\/div\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47245992689836,"sku":"A139","price":12.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A139.png?v=1789798722"},{"product_id":"a-60-w-class-ab-audio-amplifier-a-tda7296-based-single-channel-power-amp","title":"A 60 W Class-AB Audio Amplifier: A TDA7296-Based Single-Channel Power Amp","description":"\u003cp\u003eThe 60 W Class-AB Audio Amplifier is a single-channel power amplifier board built around the STMicroelectronics \u003ca href=\"https:\/\/www.st.com\/en\/audio-ics\/tda7296.html\" target=\"_blank\"\u003eTDA7296\u003c\/a\u003e. This Class-AB amplifier is suited to a wide range of applications, including home stereo systems, self-powered speakers, and high-end televisions.\u003c\/p\u003e\n\u003cp\u003eThe TDA7296's high supply-voltage rejection enables a wide voltage range. Its high output current capability lets it deliver maximum power into both 4 and 8 Ω loads\u003c\/p\u003e\n\u003cp\u003eA built-in muting function with a turn-on delay allows smooth remote operation and helps eliminate unwanted switching noise during power on\/off. The mute and standby pins each require an external 5 V supply to operate. Screw terminals are provided for the speaker, power input, and audio input signal, and a 3-pin header brings out the standby and mute control voltages. Figure 1 shows the assembled board.\u003c\/p\u003e\n\u003ch3\u003eSpecs and Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating voltage range: ±35 V\u003c\/li\u003e\n\u003cli\u003eLoad impedance: 4 ohms or 8 ohms\u003c\/li\u003e\n\u003cli\u003eKey IC: TDA7296, DMOS power stage, Class-AB\u003c\/li\u003e\n\u003cli\u003eOutput power: up to 60 W music power\u003c\/li\u003e\n\u003cli\u003eMuting and standby functions, each requiring an external 5 V control signal\u003c\/li\u003e\n\u003cli\u003eNo switch on\/off noise\u003c\/li\u003e\n\u003cli\u003eNo Boucherot cell required for most loads\u003c\/li\u003e\n\u003cli\u003eVery low distortion and noise\u003c\/li\u003e\n\u003cli\u003eShort-circuit protection and thermal shutdown\u003c\/li\u003e\n\u003cli\u003ePCB mounting holes: 4 x 4 mm\u003c\/li\u003e\n\u003cli\u003ePCB dimensions: 51.44 mm x 50.17 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47246006059180,"sku":"A142","price":22.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A140.jpg?v=1789799422"}],"url":"https:\/\/dotfry.com\/collections\/audio-amplifiers.oembed?page=2","provider":"dotfry","version":"1.0","type":"link"}