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Audio preamp circuits

Electret mic amplifier

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Parts:

U1 LM741 op amp ic
R1 1 megohm resistor
R2, R3 6.8k ohm resistor
R4 1k ohm resistor
C1, C2 0.47uF ceramic capacitor
MIC1 electret 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 condensor microphone quite nicely.. adjust sensitivity by turning R1


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