This circuit for the 40 MHz band was published in Radio Electronics magazine in December 1957. Its purpose was to monitor the signals of the Russian satellite launched at the time.
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...