Electronic Fuse (CB25411E)

This circuit was found in the December 1991 issue of Radio Electronics magazine. The circuit is based on a current transformer driving a SCR.

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Sine to Square Converter (CB6586E)
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Rain Alarm or Door Bell (CB5369E)
This circuit was found in a 1980s documentation. Q1 and Q2 can be BC548 and SCR a TIC106. The...