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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.

A simple Switch – flip flop

Given that the diode can be made to conduct, or not to conduct, simply by the choice of applied voltage polarity, then it must be possible to use any diode as a switch. So if you want to follow me, then just wire together the following circuit on a bit of breadboard, or something. Set […]

Super Booster Power Amp circuit

Super Booster Power Amp circuit using BD712, BF245A, BF256A, BC639, BF256C, BF871, BD139, BD711, BC560C, BC550C, MJE340, 2SA1930, 2SC5359, 2SC5171, 6N136

600W amplifying circuit

600W amplifying circuit using LM3886, ZTX450

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

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