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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 Amplifier Circuit using TA7227P

Audio Amplifier Circuit using TA7227P

signal generator

7400 generator Signal generator circuit using SN7400 7400 generator circuit using SN7400 IC …………. SN7400 – 7400 C1 …………. 0,1uF C2 …………. 0,1UF C3 …………. 0,1uF D1 …………. 1N60 D2 …………. 1N60 Battery 3V

Audio circuit

Audio circuit using IR2110 Audio circuit using IR2110

80 Watt Power Amplifier Circuit

80 Watt Power Amplifier Circuit using LM3876

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