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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.

Audio circuit

Audio circuit High cost using NAD3020i Audio circuit High cost using NAD3020i

electric motor speed control circuit

electric motor speed control circuit DC motor speed controller circuit using KA22134 electric motor speed control circuit electric motor speed control circuit

500 mW Audio Amplifier Circuit using LA4520

500 mW Audio Amplifier Circuit using LA4520

4Way Audio Surround Active circuit

4Way Audio Surround Active circuit using LM1877N, 7812

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