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Posts tagged DPDT

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.

PCB Design with simple

PCB design and how to move step

Amplifier Mini

Power Amplifier stereo Mini circuit using TDA2009 2x10w Part Amplifier Mini : R1 1.3 kΩ        C1 2.2 µF 35V     IC1 TDA2009 R2 18 Ω            C2 2.2 µF 35V R3 1.3 kΩ        C3 100 µF 35V R4 18 Ω            C4 100 nF R5 1 Ω 3 W      C5 22 […]

Audio Selector Circuit

Audio Selector Circuit

Transformerless Power Supply circuit diagram

Transformerless Power Supply circuit diagram 240VAC to 5V DC Power Supply using 7805 18V 1A Power Supply using LM350T, LM7818 2 Way To Build A Negative Bias Supply +5v Power Supply using 7805, LP3872ES Variable Dual Lab Power Supply 2 This low noise audio power supply circuit can reduces noise and ripple voltage by 40dB […]

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