This circuit was obtained from American documentation from 1966. It triggers when the two input voltages are within a pre-established range. The circuit can be mounted with modern transistors.
September 2017 - Arduino Lucky Shield shields containing a 5 V OMRON-g6RL relay, a Everylight...
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...
This circuit is from the owner's manual of the integrated circuits used. The manual is old, which...