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Sound Detector
Amp /
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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