This small switched regulator was found in an 60’s Optical Electronics. The circuit uses an integrated from the time, which is difficult to obtain today.
We found this circuit very simple in an old documentation. The relay is high voltage sensitive, but...
This circuit was found in an Elektor from the 90s. The circuit uses common components even today,...
The circuit, shown in figure 2, is a monostable multivibrator with two NAND ports out of the 4...