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Alarms & Security Related Schematics and Tutorials

ECM Mic Preamp / Pre-Amplifier

Electret Condenser Microphone (ECM) Diagram

U1LM741 op amp ic
R11 megohm resistor
R2, R36.8k ohm resistor
R41k ohm resistor
C1, C20.47uF ceramic capacitor
MIC1electret condenser microphone

All resistors are 5 or 10 percent tolerance, 1/4-watt all capacitors are 10 percent tolerance, rated 35 volts or higher. This circuit amplifies the output of a regular electret condenser microphone quite nicely.. adjust sensitivity by turning R1

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