This circuit was obtained from the Encyclopedia of Electronic Circuits volume 5 of 1995. The circuit uses the 4001 CMOS to obtain hysteresis in the sensor feedback.
We found this circuit on a Radio Electronics. Similar configurations can be found in this section. The...
This crystal configuration can be made with triggers of any logic. The frequency is given by the...
It can be obtained from Mouser Electronics new evaluation module for 1A stepper motors control...