This circuit was found in a Radio Electronics from February 1966. With it it is possible to trace the curve of a tunnel diode visualizing it on an oscilloscope.
Found in the 1974 Ferranti transistor manual, this Schmitt trigger circuit uses general-purpose transistors...
This circuit was developed to test suspect 4001 and 4011 integrated circuits. The circuit is from...
This power source with silicon diodes at a time when valves were still used was found in Radio...