4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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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...