Found in 1980s documentation, this oscillator uses an integrated TTL Schottly. The supply must be made with 5 V.
This circuit was found in a 1979 documentation. The transistors can be the BD136 and BD135,...
This is a traditional comparator configuration to obtain an under and over voltage indicator. In...
This circuit for medium and short-wave ranges, according to the transistor used, was obtained in...