This circuit triggers an alarm in the event of a power failure. The circuit is from an 80's documentation, being powered by 9 V battery. The parts are common today.
Found in documentation from the 1980s, this circuit can be used with other operational ones. The...
This circuit is from an old publication from 1977 and can be implemented with more modern...
This control for a small servomotor with a current of a few hundred milliamps was found in an...