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 circuit was found in a 80s American documentation. The zener diodes determine the points of...
This circuit uses an old National Semiconductor operational amplifier, but it can be implemented with...
The oscillator shown in the figure can generate signals between approximately 3 and 15 MHz,...