Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The circuit is for 150-ohm transmission lines.
This circuit is from a 1997 publication. In it, the circuit uses a light emitter that points to a...
The integrated circuit of this amplifier is not very common today. The output transistors can be...
This circuit for measuring bridges was found in American documentation from the 60's. Transistors are...