With this simple circuit it is possible to simulate a telephone line for carrying out repairs on telephone sets. The transformer must be 36 V and the diode can also be 1N4004.
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
This circuit for antiparallel control of thyristors was found in a Philips publication from 1967....
The purpose of this circuit found in a 1995 magazine is to monitor an alarm via telephone. When we...