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.
An oscillator that can be frequency controlled by a resistive sensor is shown in the figure. The...
The idea of this circuit from a 1960 publication is simple: we can switch the transistor being...
This circuit was found in a Radio Electronics from February 1966. With it it is possible to trace...