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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.

Making gameboy systems circuit

Making Gameboy systems circuit

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.

Audio VU Meter Circuit

Audio VU Meter Circuit using 4017 Audio VU Meter Circuit using 4017

Electronic circuit diagram Low distortion audio amplifier Using LA4190

Electronic circuit diagram Low distortion audio amplifier Using LA4190

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