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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.

It is a termostat for a peltier cooler !

It is a termostat for a peltier cooler ! using LM358, IFR530 It is a termostat for a peltier cooler ! Piezo buzzer Circuit using LM358, IFR530

Air Conditioning Compressor controller wiring Diagram

Air Conditioning Compressor controller wiring Diagram using relay

Home telephone

Home telephone Home telephone Circuit using LM2575-5, 2N4400, MAC224 Home telephone Home telephone Home telephone Home telephone  Circuit using LM2575-5, 2N4400, MAC224

Reverse polarity protection circuit

Reverse polarity protection circuit using 4584 IC and Relay

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