This circuit is from an old Japanese publication of 1962. The circuit uses two batteries, one for the filaments of the tubes and the other one of high voltage for the plate circuits.
In the figure we have two possible configurations for multivibrators with relay. The idea comes...
This circuit serves to isolate analog signals, for example, audio signals in a secure link...
We found this circuit in an old English documentation. Its purpose is to synchronize circuits. The...