Subwoofer Simulator (CB25130E)

This circuit consists of a bass filter that can be used as a subwoofer in a sound system. The circuit is from a Radio Electronics from May 1988.

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Simple Locked Alarm (CB18097E)
This circuit, when triggered, locks, and remains so until the source is switched off for a moment or...
Variable Timer 555 (CB15097E)
With the values of the components indicated, this timer controls intervals from a few seconds to a...
DC to AC Converter (CB25843E)
This circuit with a few watts of power was found in the April 1995 issue of Electronics Now...