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24v led ribbon does not light up with 12v battery but still lights up with 1,3v voltage with the variable transformer what is the problem?
The adjustable transformer is apparently to push the constant current until the threshold voltage of the led is exceeded and it starts to glow. Led strips are also usually operated at a certain current and it depends entirely on the length of the led strip. Each cut of the led strip increases the amount of current needed. This article explains more about this: https://ledstore.fi/blog/2023/02/23/vakiovirta-vai-tasajannite/