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How do I connect a LED to the SMPS output?
You can connect a LED with series resistor to the positive auxiliary output of the SMPS. You can use an online calculator like http://ledcalc.com/ to determine the value for the resistor. Refer to the datasheet of the SMPS for more information.https://www.diyclassd.com/FAQ-DIYClassD/FAQ-Hypex/Switch-Mode-Power-Supplies/Switch-Mode-Power-Supplies/How-do-I-connect-a-LED-to-the-SMPS-output