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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.

audio beep Circuit

Low drift peak detector circuit

Low drift peak detector circuit using LM124A, 2N929

12 volt light bulbs circuit for voltage monitoring

12 volt light bulbs circuit for voltage monitoring using OR 2907, 3906, ADC122S101

Tone control circuit

Tone control circuit using TL084 Tone control circuit using TL084 Tone control circuit R1,1′,3,3′,18 …………. 4K7 R2,2′,5,5′ ……………. 1K2 R4,4′ ………………… 1M R16,17 ……………….. 100 R6,6′ ………………… 15K R7,7′,15,15′ ………….. 220 R8,8′,9,9′,12,12′,13,13′ .. 10K R10,10′,11,11′,14,14′ ….. 22K VR1 ………………….. A50K x 2 CT VR2,3,4,5 …………….. B100K x 2 C1,1′ ………………… 470pF C2,2′ ………………… 100nF C3,3′,5,5′,10,10′ […]

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