Several decades ago I ran across a circuit as follows:
Uses a unijunction (not a PUT) to trigger a triac.
Input is mains 120vac. No transformer isolation. Isolation is not needed for my application.
Output is a single full sinewave with a long dead-time to the next full sinewave. As a potentiometer is adjusted, additional full sinewaves fill in the dead-time until full mains is output.
There is a slight dead-time at the start of each sine before the triac fires.
I am trying to find the schematic for this circuit. The circuit was published.
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