{"product_id":"hi-end-microphone-preamplifier-with-variable-compression-noise-gating-and-adjustable-gain","title":"Hi-End Microphone Preamplifier with Variable Compression, Noise Gating and Adjustable Gain","description":"\u003cp\u003eThe circuit shown here is a complete microphone signal conditioning system based on a single\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSSM2166\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eintegrated circuit. Designed primarily for voiceband applications, this integrated circuit provides amplification, RMS detection, limiting, variable compression, and downward expansion. An integral voltage-controlled amplifier (VCA) provides up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e60dB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eof gain in the signal path with approximately\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e30kHz bandwidth\u003c\/strong\u003e. Additional gain is provided by an input buffer OPAMP circuit that can be set anywhere from 0 dB to 20 dB, for a total signal path gain of up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e80 dB\u003c\/strong\u003e. The project operates on a single\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e+5 V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esupply, accepts input signals up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1V\u003csub\u003erms\u003c\/sub\u003e\u003c\/strong\u003e, and produces output signal levels \u0026gt; 1 V\u003csub\u003erms\u003c\/sub\u003e\u003cspan\u003e \u003c\/span\u003e(3V\u003csub\u003ep-p\u003c\/sub\u003e) into loads \u0026gt; 5 kΩ. The internal RMS detector has a time constant set by an external capacitor. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSSM2166\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econtains an input buffer and automatic gain control (AGC) circuit for audio and voiceband signals. Circuit operation is optimized by providing a user-adjustable time constant and compression ratio. A downward expansion (noise gating) feature eliminates circuit noise in the absence of an input signal. Onboard trimmer potentiometer allows the user to set the downward expansion threshold, the limiting threshold (rotation point), input buffer fixed gain, and the internal VCA’s nominal gain at the rotation point.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Supply 5V DC (4.5V to 5.5V)\u003c\/li\u003e\n\u003cli\u003eSupports Condenser Microphone\u003c\/li\u003e\n\u003cli\u003eAdjustable Compressions Ration using Trimmer Potentiometer\u003c\/li\u003e\n\u003cli\u003eAdjustable Rotation Point using Trimmer Potentiometer\u003c\/li\u003e\n\u003cli\u003eAdjustable Noise Gate Threshold using Trimmer Potentiometer\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Microphone\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Output\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Supply input\u003c\/li\u003e\n\u003cli\u003eLow Noise and Distortion\u003c\/li\u003e\n\u003cli\u003ePower-Down Feature\u003c\/li\u003e\n\u003cli\u003e20 kHz Bandwidth (61 dB)\u003c\/li\u003e\n\u003cli\u003ePower LED D1\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 36.99 x 26.51 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47196887810220,"sku":"A128","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/A128B.jpg?v=1789287751","url":"https:\/\/dotfry.com\/products\/hi-end-microphone-preamplifier-with-variable-compression-noise-gating-and-adjustable-gain","provider":"dotfry","version":"1.0","type":"link"}