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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.

25W Audio Amplifier Circuit using STK4142II

25W Audio Amplifier Circuit using STK4142II

Relay Driver Control circuit

Relay Driver Control circuit using NE555, 741, 1N4001, SL100, D313, C106

Switch mode PSU diagram for car audio

Switch mode PSU diagram for car audio Switch mode PSU diagram for car audio

Simple op-amp circuit using tr c828

Simple op-amp circuit using tr c828 Simple op-amp circuit using tr c828

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