Quick Start Siren (CB25765E)

We found this circuit in the October 1994 Electronics Now magazine. The CMOS IC is uncommon these days and the output is low power.

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Unijunction AC Timed Switch (CB12289E)
In this circuit found in a 1991 publication we can use the 2N2646 unijunction transistor and the...
DC Motor Control with Direction Change (CB913E)
Up to 0.5 A DC motors can be controlled by this circuit. Direction change is achieved by a logic...
Notch Filter 741 (CB10868E)
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...