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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 […]

DC Voltage Regulate circuit BD242

DC Voltage Regulate circuit 12V 9V 5v 3v 13v 16v 20v 24v 30v using BD242

Audio hi fi booster circuit

Audio Crossover Circuit using Switch ON / Switch OFF . Audio hi fi booster circuit ,Voice will be smaller when the IC TL072 not Enable or switch “OFF“ Hi–Fi Audio Power Circuit Diagram

tube Amplifier circuit for Guitar

tube Amplifier circuit for Guitar using 12AX7, 6BM8, 5Y3GT

Audio Detector And Switching Circuit

Audio Detector And Switching Circuit using LM1458

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