Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

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6 Transistors MW Radio (CB16572E)
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This continuity tester for low resistances was found in an English magazine from 1978. The circuit...
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Found in American documentation from the 1980s, this circuit rejects strong MW stations that may...