This circuit is for traditional old-style telephone lines found in an American 1980s documentation. Components are common and the optical coupler can be replaced with an equivalent.
The circuit is from an old documentation making use of an operational amplifier of the time. The...
May 2016 - Mouser Electronics is sourcing the new high-performance audio amplifiers with bipolar...
This is a configuration much explored by assemblers, being found on this site in dozens of similar...