This circuit was found in a 90’s 303 Circuits. The components are from the period and the heating system depends on the resistive element.
This 1-transistor oscillator circuit was found in the March 1965 Radio Electronics magazine. The...
This circuit shows how to control a power load using a low current switch. The circuit is half...
This circuit shows how it is possible to control 9 loads with only 6 Triacs using the matrix...