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3.3V-5 Optocoupler Photoelectric Switch Module 4 PIN Speed Counting Sensor Module Switch DIY Kit - AliExpress
TLP184 Toshiba | Toshiba, TLP184 AC Input Phototransistor Output Optocoupler, Surface Mount, 5-Pin SOIC | 168-7809 | RS Components
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BOJACK PC817 OPTOCOUPLER DIP Installation PC817C 2.54 mm Pitch 4-pin DIP-4 (Pack of 50 pcs): Amazon.com: Industrial & Scientific
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