Found in a 1980s American documentation, this circuit uses programmable unijunction transistors of the time. The time interval obtained depends on the capacitors that can be changed.
This simple unregulated power supply with half-wave rectification is for small appliances that do...
This simple latching alarm circuit using CMOS gates was found in the May 1990 Radio Electronics magazine....
This circuit was found in the October 1989 issue of Radio Electronics magazine. It drives an...