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This unit is made up of several components: CD player with random feature small ampliﬁer and speakers (recycled external computer speakers will do nicely) small motion sensor (model KC7738R) various resistors and capacitors for an RC circuit low power 555 timer and 8-pin IC socket relays 2 LEDs 22 and 24 gauge stranded wire perforated board battery packs batteries (9-volt and AAs) How to do it?! With the switch from the play button wires ON, test the lag time between the CD player power up and when it begins playing.
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