This circuit was suggested by National Semiconductor in one of its manuals. The LM108 integrated circuit, uncommon nowadays, can be replaced by an equivalent. The power supply must be symmetrical.
This 20 MHz bandwidth circuit was suggested by the National Semiconductor in 1970 documentation. Modern...
The circuit shown, found in French documentation from the 1970s, functions as a variable...
This simple circuit serves to identify the terminals of a PNP transistor. For NPN transistors, just invert...