Tamper-proof alarm (CB8963E)

This circuit was found in old English documentation. Components are common today. The circuit makes use of an optical sensor.

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Water level meter (CB6959E)
This interesting capacitive water level sensor was found in Popular Electronics. The circuit can be...
LTC7841 PolyPhase® Synchronized Boost Controllers
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Variable Reluctance Pickup Preamplifier (CB941E)
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