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 is from Mullard 1969 documentation. The circuit operates at a relatively high supply...
In this circuit of a 1968 publication the unijunction may be 2N2646 and the transistor BC548. The...
This circuit has a good performance in converting 12 V to 24 V. The circuit uses two power FETs,...