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General Purpose Timer, 555 compatible, PDIP-8 | | R3, R7 | 2 Internal clock with manual control. Clock in socket with 80 contacts (40 each side), through-hole, http://www.4uconnector.com/online/object/4udrawing/10156.pdf 4UCON 10156 Card edge socket with 80 contacts (40 each side), through-hole, http://www.4uconnector.com/online/object/4udrawing/10156.pdf 4UCON 10156 Card edge socket with 80 contacts (40 each side), through-hole, http://www.4uconnector.com/online/object/4udrawing/10156.pdf 4UCON 10156 Card edge socket with amplifier to handle weaker (<6v) signals Sequencer cascading to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a 7-segment display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see http://www.onsemi.com/pub/Collateral/QRE1113-D.PDF PhotoDiode, plastic SMD SmatDIL PhotoDiode plastic DIL RM5.08 PhotoTransistor, sidelooker package, RM2.54 PhotoTransistor.

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