This Schmitt optical trigger with LDR was found in old documentation. The relay must be sensitive, or an additional step must be used to trigger it.
This circuit was obtained in a 1986 documentation consisting of an active frequency divider for...
OSEPP makes available through Mouser Electronics a series of 100% Arduino compatible robotic kits. The...
We found this circuit in a 1977 National Semiconductor audio manual. The integrated circuit is the...