This circuit is basically a multi stage RC coupled amplifier. The main components required are following.
- CONDENSER MICROPHONE
- 1K PRESET OR POT
- BC147 AND BC149 TRANSISTORS
- RESISTORS
- CAPACITORS
- 6V POWER SUPPLY
- BREADBOARD OR PCB
CIRCUIT DIAGRAM
The circuit is a multistage amplifier capable of amplify the low power signal generated by the microphone. Transistor BC149 utilise current series feedback the first stage. The second stage comprising transistor BC147 is connected in the voltage shunt feedback configuration. These two stages provide sufficient gain to pick up even the slightest whisper.
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