We found this solid-state relay circuit that can function as a shield in a Radio Electronics magazine from December 1989. The optocoupler is a phototransistor type.
This circuit is used to light a 20 W fluorescent lamp from the 12 V of a car battery. The...
Within a range of values, this circuit converts input voltages into corresponding currents. The...
We found this circuit in the National Semiconductor Linear Applications Handbook of 1994. The...