This simple source with zener regulation is ideal for experimental projects with operational amplifiers. Other voltages can be obtained by changing the zeners and the transformer.
This circuit was found in a 1960s General Electric unijunction transistor manual. The circuit can...
In the figure we have the way to use an LM331 as a stable voltage-adjusted oscillator. The...
We found this circuit in a 1982 documentation. The circuit drives a relay when the sensors are...