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Transistor as a Switch
Electret Condenser Microphone Preamplifier by BC650C or BC549C - EEWeb
work in progress » electret microphone amplifier
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Circuit Projects Archives - Page 11 of 12 - EEWeb
electronic hobby circuits: bc 547 bc 557 transistor amplifier circuit
Wiring & diagram Info: BC549C and BC547B Microphone amplifier