I got a USB led strip from Ebay. Unfortunately there is no indication what type of led it is. Looking at power converter it says "5V Output 3x2A"

One strip has 15 leds. I want to connect it via standard battery (9V but if 3xAA are better they I am open to that.)

Also I wanted to add 3 potentiometers to be able to control each color separately. I did this on my Arduino - connected 3 10k Potentiometers and it kinda works but the knobs are not linear so I get full power when "open" and if I just "close" is a bit it loses like 50% power.

Not sure what's the best circuit I should build to make this work.

Any advice would be helpful.

Pictures attached for reference.

LED Stripe USB Power Adapter

  • \$\begingroup\$ Scrap it and buy a unit that comes with proper documentation. \$\endgroup\$ Commented Nov 13, 2019 at 12:09
  • \$\begingroup\$ Great advise, thanks a lot... \$\endgroup\$
    – aberforth
    Commented Nov 13, 2019 at 12:37

1 Answer 1


If you are going to use this continually, I suggest to use a buck converter along your 9v battery. Buck converters will reduce your input voltage to a level that is interesting to you. In this case, 5V. The other thing that makes me think that this is a interesting option is the fact that the potentiometer used to variate between voltages on the buck converter is prepared to this application, in a way that it will have small currents flowing on its terminals. Using a potentiometer in series of your voltage source will not be a good idea, since all the system current will be flowing on it and the current for the normal potentiometers is low.


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