This 10 A solid state relay was found in a 1980s documentation. It can work as a shield and implemented with modern equivalent transistors.
This circuit is from an 80's Radio Electronics. The circuit has several output options for 50 mA...
This circuit with only two transistors is from an 80's EDN. It can be implemented with two current...
The purpose of the circuit shown in the figure, obtained from a 1972 documentation, is to delay the...