{"product_id":"adafruit-electret-microphone-amplifier-max9814-w-auto-gain-control","title":"Adafruit Electret Microphone Amplifier - MAX9814 w\/ Auto Gain Control","description":"\u003cp\u003eThis fancy microphone amplifier module is a step above the rest, with built in automatic gain control. The AGC in the amplifier means that nearby 'loud' sounds will be quieted so they don't overwhelm \u0026amp; 'clip' the amplifier, and even quiet, far-away sounds will be amplified.\u003c\/p\u003e\n\u003cp\u003eThis amplifier is great for when you want to record or detect audio in a setting where levels change and you don't want to have to tweak the amplifier gain all the time. \u003cbr\u003e\u003cbr\u003eThe chip at the heart of this amp is the \u003ca href=\"http:\/\/www.adafruit.com\/datasheets\/MAX9814.pdf\"\u003eMAX9814\u003c\/a\u003e, and has a few options you can configure with the breakout.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"line-height: 1.2; font-size: 14px;\"\u003eThe default 'max gain' is 60dB, but can be set to 40dB or 50dB by jumpering the Gain pin to VCC or ground.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"line-height: 1.2; font-size: 14px;\"\u003eYou can change the Attack\/Release ratio, from the default 1:4000 to 1:2000 or 1:500.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"line-height: 1.2; font-size: 14px;\"\u003eThe ouput from the amp is about 2Vpp max on a 1.25V DC bias, so it can be easily used with any Analog\/Digital converter that is up to 3.3V input. If you want to pipe it into a Line Input, just use a 1uF blocking capacitor in series. \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003eFor audio-reactive projects, we suggest using an FFT driver library (such as the one in \u003ca href=\"http:\/\/learn.adafruit.com\/piccolo\"\u003ethis library\u003c\/a\u003e) which can take the audio input and 'translate' it into frequencies. If you just need to keep track of audio levels, see this \u003ca href=\"http:\/\/learn.adafruit.com\/adafruit-microphone-amplifier-breakout\/measuring-sound-levels\"\u003esound-level meter tutorial for Arduino\u003c\/a\u003e \u003cbr\u003e\u003cbr\u003eEach order comes with one assembled and tested board, with an \u003ca href=\"http:\/\/www.adafruit.com\/datasheets\/CMA-4544PF-W.pdf\"\u003eelectret mic\u003c\/a\u003e pre-soldered on, and a small piece of header. \u003ca href=\"http:\/\/learn.adafruit.com\/adafruit-agc-electret-microphone-amplifier-max9814\/\"\u003eAdafruits tutorial\u003c\/a\u003e will get you started with using and testing the microphone amplifier and you can check out their \u003ca href=\"http:\/\/learn.adafruit.com\/adafruit-microphone-amplifier-breakout\"\u003egeneral-purpose microphone amplifier tutorial for other project ideas and code. \u003c\/a\u003e\u003c\/p\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":568716869,"sku":"ADA1713","price":7.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/1713.jpg?v=1393423670","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-electret-microphone-amplifier-max9814-w-auto-gain-control","provider":"Pimoroni Ltd","version":"1.0","type":"link"}