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Posts tagged 40M

Schematic diagram for a broadband QRP SWR metering circuit and SSB TRANSCEIVER 80M / 40M boster filter IF Radio

A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light.

4Way Audio Surround Active circuit

4Way Audio Surround Active circuit using LM1877N, 7812

Electronic circuit diagram Low power high frequency deflection amplifier

Electronic circuit diagram Low power high frequency deflection amplifier

Electronic circuit diagram audio amplifier AN7147 5w

Electronic circuit diagram audio amplifier AN7147 5w

Tube monoblock amplifiers

Tube monoblock amplifiers Circuit Diagram

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