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LED Flip Flop Circuit using BC547 Transistors
Bc548 Transistor Switch Circuit
DIY Relay Module Using BC547 and Relay Only - Hackster.io
Homemade MIC Amplifier Circuit Diagram, MIC Loud speaker Circuit
Four preamplifier circuits using transistors
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Electret Condenser Microphone Preamplifier by BC650C or BC549C - EEWeb
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work in progress » electret microphone amplifier