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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Delayed SCR trigger (CB19336E)
The circuit shown is from an old European publication. In it we have the way to activate a relay...
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We found this circuit in a European publication from the 1990s. Transistors are still common types...
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This circuit was found in an American documentation and can be added to common amplifiers of any...