This circuit was originally suggested in a 1968 publication to generate a white mark (frame) on a film at regular intervals to serve as a time reference.
This siren was found in a 1980s documentation. The circuit makes use of very old operational that were...
November 2016 - Super capacitors from 1 F to 3 500 F from AVX can now be purchased from Mouser...
The diode of this circuit must have current according to the motor. What it does is apply motor...