I would like to power LEDs directly from the secondary AC current of a transformer, using only a limiting resistor. How do I calculate this resistor?
LEDs cannot be powered directly by AC for a reason. These components cannot be reverse biased with voltages above 5 V. If this occurs. LEDs may burn out. Thus, its supply must be with a direct current circuit. Article ART288E (How to Use 110V and 220V LEDs) teaches exactly how to do both voltage reduction and conversion to direct current.
