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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