Subwoofer Filter (CIR25262E)

This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit is part of a home theater sound system.

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Small unijunction organ (CB23749E)
This simple circuit with a unijunction transistor at the time appeared in Radio Electronics...
Radio Booster Amplifier (CB18415E)
This circuit was used to reinforce radio signals for listening on the phone, making it possible to listen...
Dimmer with smooth shutdown (CB7224E)
This circuit was found in General Electric documentation from 1968. The circuit uses triac from the...