Ripple Filter (CB6724E)

This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according to the desired output voltage and current.

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Simple Ohmmeter (CB11932E)
This ohmmeter can be made with a scrap milliammeter used for continuity tests or even resistance...
555 2-Range Relay Up to 10 Minutes (CB25535E)
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
Mark generator (CB7526E)
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...