{"title":"Electret Microphone Amplifier - MAX4466 with Adjustable Gain","handle":"electret-microphone-amplifier-max4466-with-adjustable-gain","url":"/products/electret-microphone-amplifier-max4466-with-adjustable-gain","description":"A well-designed electret microphone amplifier breakout built around the Maxim MAX4466 op-amp, specifically engineered for microphone amplification with excellent power supply noise rejection. The board comes fully assembled and tested with a 20–20 kHz electret microphone soldered on.\n\nA trimmer pot on the back lets you adjust gain from 25× to 125×, producing output from approximately 200 mVpp (line-level, suitable for audio equipment) up to about 1 Vpp (ideal for microcontroller ADC input). The output is rail-to-rail and DC-coupled with a bias of VCC/2.\n\nKey Features\n\n\nMAX4466 Op-Amp – Low-noise amplifier designed specifically for electret microphones\n\nAdjustable Gain – 25× to 125× via onboard trimmer pot\n\nWide Frequency Response – 20 Hz to 20 kHz electret microphone\n\nRail-to-Rail Output – Up to 5 Vpp on loud sounds\n\nLow Power – Operates from 2.4–5 V DC\n\nFully Assembled – Microphone pre-soldered, ready to use\n\n\nSpecifications\n\n\nAmplifier IC: Maxim MAX4466\n\nGain Range: 25× to 125× (adjustable)\n\nOutput at Normal Speech (~6\"): ~200 mVpp (25×) to ~1 Vpp (125×)\n\nOperating Voltage: 2.4–5 V DC\n\nOutput Bias: VCC/2 (DC coupled)\n\nFrequency Range: 20 Hz – 20 kHz\n\n\nWiring\n\n\nVCC – 2.4–5 V (use the quietest supply available, e.g. 3.3 V on Arduino)\n\nGND – Ground\n\nOUT – Audio waveform output (DC biased at VCC/2)\n\n\n\nTip: Connect OUT directly to a microcontroller ADC pin — no decoupling capacitor needed. For AC-coupled audio equipment, place a 100 µF capacitor between OUT and the input. The output pin is not designed to drive speakers directly; use an external audio amplifier for speaker output.\n\n\nIdeal For\n\nAudio-reactive LED projects using FFT\nVoice changers and audio effects\nSound level monitoring and sampling\nCircuitPython and Arduino audio projects\n\n\nPackage Contents\n\n1× Electret Microphone Amplifier Breakout (MAX4466, fully assembled)\n\n\nResources\n\nFFT Audio Visualiser Project (Adafruit Learn)\nVoice Changer Project (Adafruit Learn)\nSound-Reactive NeoPixel Pendant – CircuitPython (Adafruit Learn)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":6895,"title":"Default Title","sku":"AF-1063","price":14.05,"on_sale":false,"in_stock":true,"available_quantity":104,"option1":"Default Title"}]}