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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.

LM339 IC for Voltage Detector and Circuit Diagram

LM339 IC for Voltage Detector and Circuit Diagram

Audio Amplifier + TONE CONTROL Circuit

Audio Amplifier + TONE CONTROL Circuit using NE5532, LM1875T / TDA2050

Vertical TV Stand using AN5512

Vertical TV Stand TV Vertical Deflection Output Circuit using AN5512 for philips, Toshiba, Sharp,  DiGiTEC

Guitar headphone amp circuit

Guitar headphone amp circuit using NE5534, OPA2604, MJE340, MJE350 If you intend to use the headphone amp circuit with guitar

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