This circuit is from Motorola's Linear Interface ICs from 1993. The MC1723 is the equivalent of the well-known 723. The transistor supports equivalents.
In the figure we have a simple timer with the 555 feeding a relay directly. The circuit is from...
ON Semiconductor NTMJS1D5N04C 40V Industrial MOSFET Available from Mouser Electronics, these ON...
To control relays safely with double insulation, we suggest the circuit in the figure. The optical...