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 has a traditional configuration explored in several other points of this site. The...
This source of constant current with MOSFET was found in documentation from the 1980s. The MOSFET...
The oscillator circuit is an ICM7556, the dual CMOS version of the 555. The frequency depends on...