This circuit was suggested by Sprague Electric in an 80's documentation. The circuit uses a tachometric sensor for feedback. The current was not indicated in the original documentation.
This remote control or light-beam operated switch was found in the June 1970 Radio Electronics magazine....
This circuit is valid for other comparators of the same series. In this case, a lamp is excited, but...
This circuit is suggested by Motorola and allows to obtain a much higher voltage for switching a power...