Labels:text | diagram | plan | technical drawing | schematic OCR: Light/Dark Detector Brought to you by: TOM CAT Voc +9v DOMAIN BBS 208-375-6571 IL R1 Photo S1 (A) resistor D 8 7 RE - 4 - 6 555 - R3 10K - S1 (B) 2 3 + C2 ₩ 4.7uf C1 = 1 .047 8 ohm speaker R1 and C1 determine frequency of tone. When S1 is in "L" position the speaker will emit a tone when the photo resistor is struck by light. When S1 is in "D" position the speaker will emit a tone when photo resistor is NOT illuminated.
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