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.
This circuit is from an 80's documentation. The transistor can be any general purpose PNP and the...
The TDA2040 is not a common IC these days, but if you find one you can build this high quality...
Vz determines the trigger point for this protection circuit. The SCR doesn’t need to be mounted on a...