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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.

Battery Charger Circuit 12V to 1.2V

Battery Charger Circuit 12V to 1.2V using MAX713, MC33171, LM2904, NTE2904

50W Stereo Audio Amplifier circuit

50W Stereo Audio Amplifier circuit using STA505

Low impedance microphone amplifier is the best

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 9-30VDC. If you don’t build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this case, you should directly connect the signal to C7.

TDA2050 Amplifier Layout and Circuit Diagram

TDA2050 Amplifier Layout and Circuit Diagram 32W Power Amplifier Circuit based TDA2050, SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS,  Hi-Fi Audio Amplifier with TDA2050, TDA 2050 is a monolithic integrated circuit, Printed circuit board layout component, project schematics & PCB layout

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