Electret mic + OpAmp

Takes the output of an Electret Mic, amplifies the signal and passes the output into an Analogue Input or a headphone jack.

fritzing-repo/projects/e/electret-mic-opamp/images/Fritzing.png

This circuit uses an LM385 Dual OpAmp IC to increase the signal strength from an Electret Mic.

All told, it's a very simple amp, and a great starting point for countless hours of tinkering.

Almost all parts on the board come in most Arduino Starter Kits.

By d2kagw
Created on November 5, 2011, 01:58

Category: Analog

Difficulty: amateurs

License:  Creative Commons Attribution-Share Alike 3.0 Unported License

Tags: lm358, opamp, audio, electret, mic

Files

Fritzing Files

Basic OpAmp.fzz

Comments

  1. paulcardno # Aug. 1, 2012, 1:19 a.m.

    hey thanks for this. Just want I'm looking for, now to build it :)

  2. nathangunn # Aug. 29, 2012, 9:47 a.m.

    Hi, Im trying to make a small 1.5w incandescent bulb respond directly to noise picked up through an electret microphone. I have assembled the circuit above on a breadboard but to no avail. Anything I might be doing wrong? Where should I be placing the bulb in the circuit? Any suggestions are most welcome.

  3. nathangunn # Oct. 1, 2012, 8:27 p.m.

    Yeah problem solved, the mic is getting no power in the diagram.

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