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Question:

Three beads bathroom mirror lamp LED 12V35w halogen lamp. A transformer is required. Buy a new transformer, press

Three beads bathroom mirror lamp LED 12V35w halogen lamp. A transformer is required. Buy a new transformer, press

Answer:

LED lights with direct current, and positive and negative plate must be divided, please, you use 40KHz AC lights, I think the error, to use high frequency diode rectifier, filter and then connected to the lights.
Beads must be greater than the sum of power transformer power, the bigger the better, if the lights with the power is 50W, the best 80W more than just good transformer.
The power of the transformer is too low

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