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.
In this circuit, the output voltage is Vxx plus the zener voltage. The circuit is from the SGS...
In the figure, from a documentation from the 70s, we have a few-watt amplifier for general use....
Using a CMOS 4001, this circuit provides frequency readings on an analog instrument. The idea of...