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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.

Regulator Kondensatoren Capacitors circuit

Regulator Kondensatoren Capacitors circuit using LM317T, LM337T, BC547C, BC557C

Stereo Speaker Protection Circuit

Stereo Speaker Protection switch very important Stereo Speaker Protection Circuit using TR C458, C1383, C1384

7812 voltage regulator circuit

7812 voltage regulator circuit using 7815, 7812, 21DQ60

Images for transistor audio signal circuit diagram

Transistor audio signal circuit diagram Transistor audio signal circuit diagram using C945 Transistor audio preamplifier or transistor audio signal circuit diagram,  Cross Reference, … circuit Brain wave transistor audio signal circuit diagram

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