The circuit shown is from Motorola's 1990 Linear Databook. Shaded components are optional. The characteristics of the coils are given next to the diagram.
The transistor of this remote preamp can be the BC549. We found this circuit in a 1976 technical...
Although it is a common configuration today, these circuits were taken from an old publication. The...
We found this circuit in a 1982 publication. This source allows an adjustment of the output...