This shield circuit is from an American documentation from 1969. The components can be modified according to the relay and power, and the coupler can be of a modern type.
The circuit shown in the figure can either be used to activate a high-power lamp or LED for...
This circuit was found in a 1999 British magazine (ETI). It is a device that receives the signal...
The figure shows how to couple two CMOS circuits using an optical coupler to achieve isolation. The...