Found in an old English publication, this circuit applies to the 240 V network, but can be changed to lower voltages. Transistors are mostly general-purpose, admitting modern equivalents.
This circuit was obtained from a 1967 General Electric documentation. The circuit makes use of...
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...
We found this circuit in a 1973 technical documentation. The circuit is implemented with the doors...