This circuit is from an American publication of the 80's. It makes use of components of the time. However, the circuit is the basis for a modern shield application since the input is TTL.
This stage was found in a 1964 Electronic Design. The transistors are of the time and the shape of...
This configuration with the 741 Operational Amplifier has an NAB equalization for magnetic...
We found this circuit in an application note from Linear Technology of the 90s. The circuit uses...