Conventional Astable (CB24839E)

This common circuit is from September 1984 Radio Electronics. The transistors are general purpose, and the frequency is given by the capacitors.

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Modulated Siren (CB13036E)
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28 V x 3 A Switching Regulator (CB24281E)
This circuit was found in the August 1973 issue of Radio Electronics magazine. The Darlington...
Unijunction Modulated Siren (CB11821E)
This circuit has three settings, central sound frequency, modulation speed and modulation depth. The...