This circuit was found on an old EDN and can be used as a shield. Optical couplers are from the era and modern equivalents can be used.
We found this circuit in a Popular Electronics from the 90's. The circuit uses three SCRs to...
Found in a QST magazine from the 90s, this circuit broadcasts on different amateur radio bands...
Found in a 1965 General Electric documentation, this circuit uses a zener diode to obtain the...