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How to determine PCB polarity for LED (no +/- marking) : r/synthdiy
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How to Indicate Placement Orientation of Diodes and LEDs on Your PCBs
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SMD LED polarity marking: is the cathode marking standardized? - Electrical Engineering Stack Exchange
How to Build a PCB: Diode Polarity (No, It's Not Obvious) - EEWeb
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pcb design - Whats the standard for denoting the orientation of an LED on a PCB? - Electrical Engineering Stack Exchange
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