This circuit makes use of a stroboscopic tube, a component that no longer exists today. The circuit is from the 70's and can be adapted to use mains voltage.
The SCA is a signal superimposed on the FM signals that make it possible to eliminate...
This circuit was found in a 80s American documentation. The zener diodes determine the points of...
It actually consists of a tunable field strength meter. The circuit is of an old documentation and the...