This circuit can be used to obtain a zener voltage from a common zener of another value, adjusting in a multimeter. The circuit is from an American documentation of the 1970s.
This small power amplifier makes use of an output transformer given its design time. In fact, the...
This circuit uses an optical coupler called Raystor created by Raytheon in the 1960s. The circuit...
This circuit is an improved version of the previous ones with the LM3914. We found it in the March...