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 temperature compensated circuit was found in a Popular Electronics of the 1990s. The circuit...
This LED special effects circuit was found in the February 1992 Radio Electronics magazine. The...
This circuit is part of an oscilloscope project with the PC. Its purpose is to record a peak in a...