Using a dual 555 CMOS this very useful circuit on the bench was found in the July 1998 Electronics Now magazine. The circuit is battery powered.
We found this circuit in 1967 General Electric documentation. SCRs can be replaced by current...
The component used in this regulator is not common today. The switching circuit is from an 80's...
This filter was found in the May 1989 issue of Radio Electronics magazine. The components can be...