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Posts tagged QRP,

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.

Earthquake Detector

Earthquake Detector Biased photodiode, Earthquake Circuit Diagram, earthquake detector, frequency counter, optical receiver, Oscilloscope, plane miror, two frequency laser  

High power amp modules

High power amp modules High power amp modules High power amp modules High power amp modules using STK4141

Build a Circuit Educational Game

Build a Circuit Educational Game using CD74HC75, CD74AC20

Circuit diagram of motor speed control Maxim MAX4295

Circuit diagram of motor speed control circuit Maxim MAX4295

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