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sound detector amp/electret mike amp:
sound detector amp/electret mike amp schematic
click here to enlarge schematic

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 condensor microphone quite nicely.. adjust sensitivity by turning R1
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