Alternator monitor (CB8955E)

This circuit for automotive use was found in 90s American documentation. It is possible to monitor the functioning of a car alternator.

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Dalayed Turn-On Gate (CB123)
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Amplitude Modulated RF Amplifier (CB15007E)
This circuit was found in a Poptronics of the 90's. The FET is double-gate, and the frequency...
Water activated alarm (CB7993E)
This rain, flood or leak sensor was found in a 90s Popular Electronics. All the components used are...