This circuit digitally counts input pulses. The circuit from a November 1970 Radio Electronics uses unijunction programmable transistors. Note the counted pulse duration.
This multiple switching power supply was found in the April 1991 issue of Radio Electronics...
We found this circuit in an old documentation. Its purpose is to turn on warning lights when the...
This Power supply sources from 500 to 1,000 mA according the transformar and was found in a...