This circuit was found in Motorola documentation from 1966. The lamps are according to power and current according to the components used which are uncommon today.
This circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type operational....
At dusk this circuit triggers a relay switching lamps. The circuit can be powered from 6 to 12 V...
September 2016 - Mouser Electgronics already has in stock the new moisture digital sensor HDC1010...