We found this circuit in documentation from the 1980s. The component values are calculated using the formulas next to the diagram.
This circuit is intended to reinforce old car radios, having been found in 1997. At that time,...
I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but...
Being able to operate with frequencies up to 100 kHz, this circuit was found in a 90’s...