This circuit provides a signal when dialing occurs. The circuit is powered by the telephone line voltage itself. We found it in an old documentation.
This 80's circuit uses germanium transistors like the AC125, AC151, AC163, 2N506 and others to...
This circuit was obtained in an old American manual. The circuit is valid for any operational. The...
We find this circuit in a 1980s documentation. The circuit is for SSB modulation and the...