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7 MHz SSB Transceiver

7 MHz Transceiver	Advice for beginers	Winding Coils	Test Equipments
Power Supply	Variable Frequency Oscillator	Carrier Oscillator	Audio Amplifier
Mic Amplifier	Receiver Front End	MC1496	Ladder filter
IF Amplifier	Linear Amplifier	Power Amplifier	Block Diagram
Circuit - Part 1	Circuit - Part 2	Antenna	Conclusion

Microphone Amplifier

Microphone amplifier consists of LM324 and two transistors. LM324 is available in 14 pin DIP. I brought it for Rs: 6/-. It contains four identical operational amplifiers. Transistors BC548 and BC558 are used as compressor.

I used 2-wire shield wire for connecting microphone. One wire is used for condenser microphone and the other for PTT switch. Shield serves common ground to both.