Battery and Alternator Monitor (CB26311E)

This automotive grade circuit was found in a 1991 Electronics Hobbyist. The transistors are general purpose types. P1 sets the monitoring voltage.

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Rain Alarm (CB5366E)
This circuit appears elsewhere in this section, but taken from other sources. This is an English...
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Found in a 1975 radio amateur publication, this simple oscillator is for code practice. The PNP...
PWM motor control (CB7996E)PWM motor control (CB7996E)
This circuit for some amps was found in a 90s Radio Electronics. The voltage can be between 6 and 25 V...