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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.

Charge Balance converter circuit

AD7711 IC for Charge Balance converter circuit

Make 2.45GHz RF Signal Detector

Make 2.45GHz RF Signal Detector This passive RF indicator is made from a few simple parts.  A 100uA moving coil meter is used to display the relative intensity of the RF signal.  This circuit can be used with some cellphones and many cordless telephones.

tube amplifier Circuit

tube amplifier Circuit using LT1065, EL34, 1N4007, B40C3700, 1N4001

5W Audio Amplifier Circuit using AN7168

5W Audio Amplifier Circuit using AN7168

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