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.
The time constant of this circuit is 100 x R1 x C1, which leads to the possibility of obtaining times...
This circuit with a double-gate MOS transistor was found in a Popular Electronics from the 90's....
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...