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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Missing Pulse Detector (CB15633E)
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Proximity switch (CB22211E)
This proximity sensor was found in old documentation. The transistors can be BC548 or BC558 for...
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This circuit is based on the TDA3810N. We found it in the March 1992 issue of Radio Electronics magazine....