This circuit is from a 1975 Miniwatts magazine, therefore using Philips components from that time, now difficult to find. The circuit directly controls a heating element via a Triac.
This circuit for the logic control of the 555 in a power supply was found in the October 1989...
This circuit makes use of an uncommon TTL component today, but it can be implemented with...
In the figure we have a circuit used in stair generators with the purpose of providing constant...