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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


The transceiver requires 12 volt for most of the circuitry and 120 V for the final. The power supply should be capable of supplying the maximum current required with good stabilization. I used commercially available 40 - 0 - 40 5A transformer. The transformer have 6V, 9V, 12V and 22V windings also. The transformer cost me around Rs: 370. Power supply provides 110 Volt 2.5 Amps or 55 Volt 5 Amps. Three-pin regulator IC is used for regulating 12-volt supply. Good heat sink should be provided for regulator IC.

All diodes in the bridge rectifier are shunted with 0.1 uF 100 V capacitor (C1 to C8) to keep the diode protected from high voltage transients on the AC line as well as reduce inter-carrier hum modulation of RF that may be picked up by the mains. Always use fuse in 120 V supply line. This can avoid hand full of burned IRF. It also protects the power supply itself. My final consumes around 1 A at peak. I used 0.5 A fuse; it won’t go QRT with 1 A peak current. It is better to use a fuse that can just withstand the peak current.

Circuit diagram of Power Supply for 7MHz SSB Ham Radio Transceiver.

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