Regulator Crowbar Protection (CB13916E)

We found this circuit in a 1978 documentation. The SCR conducts when the regulator's output voltage exceeds the zener voltage.

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Stereo preamplifier (CB20654E)
We found this circuit in a Hands-on Electronics from 1985. The circuit is based on common...
Reflected Power Adapter and Monitor CW (CB3884E)
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Voltmeter (CB7953E)
JFET This configuration, quite common in this section, was found in a 90s American documentation. The...