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.
This is one of many possible versions for an oscillator with the 4093. We found it in January...
This configuration can be found elsewhere in this section. This was obtained from old RCA...
In the figure we have a converter that generates a negative voltage from a positive voltage...