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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Manually triggered VCO (CB19082E)
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
Automatic Telephone Recorder (CB5992E)
This circuit turns on an old cassette recorder when the telephone rings, thus enabling the...
Incandescent Flasher (CB4595E)
This circuit can be used in panel signaling with common incandescent lamp. The lamp will flash at a...