Wednesday, July 29, 2009

sound detector amp/electret mike amp:

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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