This circuit controls a heating element using a triac. Triac must be fitted with a heat sink. We find it in an American documentation from the 80s.
The circuit presented was obtained from an Electronics Now magazine from February 1995. The...
This circuit is powered by 1.5 V and has a long lifespan as it consumes only 320 uA. The circuit is...
Today we have more compact solutions. This is from a Radio Electronics magazine from October 1990....