This long interval timer was found in the September 1976 issue of Radio Electronics magazine. The output can be used to control a relay. The circuit achieves timings of up to 14 hours.
This simple inverter was found in a 1997 documentation. Its purpose is to apply a high voltage to a...
For this circuit, the polarity of the power input does not matter, as the output terminals will...
In the figure we have the way to control an SCR with a programmable unijunction transistor (PUT)....