6W Variable Tone Siren (CB25213E)

This CMOS circuit was found in the July 1990 Radio Electronics magazine. Power is for a 12V supply.

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Automatic Water Pump (CB16779E)
This circuit starts a water pump at a lower level of the reservoir and then turns it off when it...
Asymmetric Astable Multivibrator (CB19415E)
This interesting transistor configuration, which can be seen elsewhere on this website and in this...
Power for Soldering Iron with 2 Temperatures (CB18100E)
The basis of this project is a three-position lever switch or similar. When the switch is in the...