CMOS Siren (CB26157E)

Found in the 1991 Electronics Experimenter Handbook magazine, this circuit has good power and is recommended to be triggered by light.

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Rain Alarm (CB5366E)
This circuit appears elsewhere in this section, but taken from other sources. This is an English...
Code Practice Oscillator (CB1429E )
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...