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.
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
This 1980s circuit uses components of the era that can be replaced by modern equivalents. For the FET we can...
The components used in this 80's circuit are uncommon today. The circuit is intended for...