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.
It serves as a reference, since today we can have simpler and more compact solutions. This circuit is...
This circuit is from an old manual from National Semiconductor (Now Texas), using the LM2877 not...
This circuit is from the Motorola Linear Databook published in 1990. The circuit for 1 kHz can be...