Suggested by Sprague in the 1980s documentation, this circuit can control three-phase AC motors. The original documentation does not specify the maximum motor current.
Figure Bellow shows how to use a 7490 (TTL) IC to divide the frequency of a TTL signal by 6; The...
This circuit was obtained in an old US 1974 documentation when Nixie tube displays were common. The...
This source draws a fixed constant current of 1 mA using a Norton operational amplifier. Other...