This circuit is one of many of its kind that can be found on this site. This one is from a September 1987 Radio Electronics. The triac must be controlled according to the load.
This circuit uses one of two D-type flip-flops available on an integrated circuit 4013. The...
We found this circuit in an old English documentation. The idea is a momentary indicator that...
I found this circuit in an old document from 1981. The circuit can be implemented today with the...