Short circuit protection circuit (CB21197E)

This circuit was taken from a Popular Electronics from the 1990s. The circuit triggers a relay that disconnects the load.

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Triac and UJT Dimmer (CB857E)
This high power dimmer uses a unijunction transistor to trigger the triac. The triac is choosen...
327 Hz High Pass Filter (CB13506E)
This frequency corresponds to musical note C3. Frequency accuracy depends on the accuracy of the...
Transformerless power supply (CB21159E)
This transformerless power supply uses an SCR as a regulator. It was found in a Popular...