{"product_id":"voltage-controlled-amplifier-with-balanced-input","title":"Voltage Controlled Amplifier with Balanced Input","description":"\u003cp\u003eThe project presented here is a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eVoltage Controlled Amplifier\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(VCA). A VCA board helps users control the audio level from a remote potentiometer. This board requires a balanced audio signal. Gain control voltage can be adjusted through potentiometer R13. The project works with a dual (±15V) power supply. Screw terminal connectors are provided for signal input and signal output. The project is built using\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTHAT2181LA\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip which is a VCA, designed for high performance in audio-frequency applications requiring exponential gain control, low distortion, wide dynamic range, and low control-voltage feedthrough. This chip controls the gain by converting an input current signal to a bipolar logged voltage, adding a DC control voltage, and re-converting the summed voltage back to a current through a bipolar antilog circuit. Stereo control of VCA with a single potentiometer is possible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTHAT2181\u003c\/strong\u003e–\u003cstrong\u003eseries\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003etrimmable Blackmer voltage-controlled amplifier (VCA) ICs are very high-performance current-in\/current-out devices with two opposing-polarity, voltage-sensitive control ports. They offer wide-range exponential control of gain and attenuation with low signal distortion.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower Supply +\/-15V DC @ 40mA\u003c\/li\u003e\n\u003cli\u003eTotal Harmonic Distortion 1V 0dB Gain 0.0025%\u003c\/li\u003e\n\u003cli\u003eScrew Terminal for Balanced Audio Input\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Power Input\u003c\/li\u003e\n\u003cli\u003eScrew Terminal for Audio Output\u003c\/li\u003e\n\u003cli\u003eOn Board Power LED\u003c\/li\u003e\n\u003cli\u003e5mm Mounting Holes\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 53.34 x 25.72mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCN1: Balance Audio Signal Input, Pin 1 = Audio-Hot, Pin 2 = GND, Pin 3 = Audio Cold\u003c\/li\u003e\n\u003cli\u003eCN2: Pin 1 = Audio Output, Pin 2 = GND\u003c\/li\u003e\n\u003cli\u003eCN3: Pin 1 = 15V DC, Pin 2 = GND, Pin 3 = -15V\u003c\/li\u003e\n\u003cli\u003eD1: Power LED\u003c\/li\u003e\n\u003cli\u003eR13: Gain Adjust Potentiometer\u003c\/li\u003e\n\u003cli\u003ePR1: Symmetry Adjust\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47036655304876,"sku":"A105","price":24.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A105A.jpg?v=1787564808","url":"https:\/\/dotfry.com\/products\/voltage-controlled-amplifier-with-balanced-input","provider":"dotfry","version":"1.0","type":"link"}