This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
We found this circuit that triggers an SCR in the Encyclopedia of Electronic Circuits volume 5 of...
This circuit is from an American publication translated from 1974, but it is feasible since modern...
We found this circuit in the April 1993 Electronics Now magazine. Almost any general-purpose JFET...