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Circuit diagram 75 Meter QRP SSB Transceiver

The 75 Meter QRP SSB Transceiver Theory of Operation 6-30-03 In general, the transceiver switches the 4-element 1500 ohm xtal BPF ends between the inputs and outputs of the two SA602s to reverse the signal flow for R/T operation. Since no IF amplifier is used in the design, 20 dB of additional receiver gain is […]

Simple Audio Circuit

Simple Audio Circuit using LM386

Modified Electronics circuit power supplay

Further adjustments include a rectified and filtered heater supply to the triodes eliminating AC hum coupled to the signal path via parasitic wiring capacitances. A power transformer with a 350V-0-350V secondary supply an increased voltage supply to the output section with is then stepped down to the 5F6-A’s voltage supplies to the phase splitter, cathode […]

Circuit of 2m Linear Amplifier 144MHz 45W

Circuit of 2m Linear Amplifier 144MHz 45W using SC-1022

Circuit Diagram CB fm 27mhz Receiver Diagram

Circuit Diagram CB fm 27mhz Receiver Diagram 27MHz FM-CB receiver built with TCA440 for listening CB transmissions with FM. The selection is made with ceramic filters. This 27 MHz receiver works with an intermediary frequency of 455 kHz.

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