Car Alarm (CB8925E)

This circuit was found in a 80’s Popular Electronics. The components are common and the 8-ohm speaker.

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Power Supply Protection (CB16352E)
This circuit is very useful for the experimenter who may have his power supply damaged in the...
Code Practice Oscillator (CB940E)
This circuit uses one of the first comercial transistor and is from a 1958’s magazine. Tone...
Long period integrator (CB6843E)
Suggested by National Semiconductor in documentation from the 90s, this circuit makes use of an...