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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.

50 watts audio amplifier

50 watts audio amplifier using LM3876

28W Audio Amplifier Circuit using STK4311

28W Audio Amplifier Circuit using STK4311

Big Power Amplifier Circuit

Big Power Amplifier Circuit using IRF640, IRF9640, 2N5551, 2N5401, 2N2222A, BD139, 2N2907A

Audio Circuit

Audio Circuit using IC1 NE5534 and TR  2SK135, 2SJ50 Part Audio Circuit : R1 33 kΩ         C1 1nF 63V                    D1 1N967B zener 18V 0.5W R2 6.8 kΩ        C2 47 µF 40V               D2 1N967B zener 18V 0.5W R3 22 kΩ         C3 100 nF 63V            D3 1N4148 R4 100 kΩ       C4 100 nF 63V            […]

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