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 operational amplifiers from the same family such as MC34002, MC35001, MC34004 and MC35004 can...
This circuit for 12 V relays was found in the July 1992 Radio Electronics magazine. The circuit is set...
The figure shows how to add a Darlington stage to an operational amplifier in order to obtain a...