The presented circuit uses an opto-SCR. We found the circuit in the GE semiconductor manual. Equivalent triacs, depending on the load current and voltage, can be used.
Found in an Electronic World, this circuit is designed to control solenoids up to 5 A. The circuit...
This voltage regulator circuit has 1 A of maximum current for a TIP32 and 500 mA for a BD136. The...
This circuit includes the power supply from the power grid. We found it in Radio Electronics from...