This circuit is from a 1982 publication. How about waking up to the first rays of sunlight? No, you do not need a good cock for that! The circuit we give here takes the place of the rooster and wakes you up with the light of dawn, triggering an alarm, your bedside radio or whatever you want ... An LDR is the sensitive element that, when receiving the first dawn rays, activates a relay. The relay can then be used to connect any device the reader wishes. Simple to assemble and highly efficient, this device can stay on all night without danger of wear to the batteries, due to its low consumption.
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