Found in Ferranti's 1969 documentation this circuit has a maximum operating frequency of 7.5 MHz. The circuit can be designed with modern transistors.
This circuit that can only be used with simple resistive and inductive loads (never electronic) was...
This digital instrument input circuit was found in the September 1989 issue of Radio Electronics...
This circuit was found in an 80s documentation. The integrated circuit used is from that time,...