This simple metronome, from 1985 documentation uses only transistors and has two settings. For voltages above 6 V, up to 12 V, replace the BC557 with a BD136.
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...