This circuit was found in American documentation from the 90's. The circuit applies to any operational. The power supply can be between 5 and 15 V depending on the operational.
This circuit for RF signals was found in the March 1987 issue of Radio Electronics magazine. The...
This circuit uses a digital module from the time. We found it in February 1984 Radio Electronics...
This circuit uses old germanium transistors because it was found in an old magazine from 1973....