Jacob's Ladder (CB21079E)

This circuit was found in American documentation from the 90's. The transformer is of the high voltage type for old light advertisements.

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Schmitt trigger (CB7983E)
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This sensitive circuit was found in the August 1971 issue of Radio Electronics magazine. The SCR...
Varicap Beat Oscillator (CB25649E)
The varactor or varicap diode tunes the signal for listening to SSB signals on a common receiver. The...