This series LED circuit was found in the February 1992 issue of Radio Electronics magazine. The effect's speed is dependent on C1 and adjusted by R3.
The circuit shown in the figure shuts off a load when the voltage drops below the value determined...
This circuit was found in an American documentation from 1969. It serves to trigger circuits by...
We found this circuit in an American 1980s documentation. Other comparators can be used and the...