Found in Ferranti's 1969 documentation, this circuit can be mounted with a modern equivalent transistor. The circuit has a 4 V immunity and can be used as a shield for sensors.
Found in a 90s Maxim documentation, this circuit disconnects the battery in case of overload. The...
In the figure we have a voltage / frequency converter circuit that can be used as a transducer interface...
This circuit is from a 1979 documentation. The FET can be the BF245 or MPF102 and the bipolar...