We found this circuit in the July 1988 Radio Electronics magazine. The frequencies are given by capacitor C1 and the voltage input is made at pin 1.
This circuit has a start and reset switches and can generate signals at long intervals determined by the...
We found this circuit in English documentation for PCs from 1996. The ZN448 is a very uncommon...
This circuit produces a sequence of steps controlled by P1 and applied to a 12V stepper motor with...