Posted on Feb 5, 2014

Low light on cadmium sulfide photocell (Radio Shack 276-116) produces series of clicks in miniature 8-ohm loudspeaker. As light increases, clicks merge into audio tone that increases in frequency as light intensity increases. Can be used for classroom demonstrations or as sunrise alarm clock. Circuit is quiet in total darkness. -F. M. Mims, `Optoel

Click here to download the full size of the above Circuit.

ectronic Projects, Vol. 1, " Radio Shack, Fort Worth, TX, 1977, 2nd Ed. , p 61-66.

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