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A 5mm led, with a 7-segment display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler IR Receiver Vishay TSOP-xxxx, MINIMOLD package, see https://www.vishay.com/docs/82493/tsop311.pdf package for Kodenshi SG-105 with PCB trace layout Checkpoint in.

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