This circuit from Motorola is from 1968, appearing elsewhere on this site. The transistors admit equivalent and the relay is of the sensitive type for low voltage, according to the power supply.
We found this circuit in an American documentation from the 90s. Through an LED it indicates the...
August 2016 - It can be purchased from Mouser Electronics the new digital isolators ADuM120N and...
In this circuit, from a documentation from the 70's, we have the way to control the active cycle of...