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The smart way is to use a voltage regulator for 5v. So you have always exactly 5 volt. The MR boards should be working great with 5v.
That was my plan for my Lightsaber BUT there is not enough...

Thank you very much for youre help =)

For this project its better for me just to solder a few transistors between the blade and the hasbro board. But for a costum made Lightsaber it would be great...

Dear Jedi and Sith,

i need your help and i hope youre better than my german friends.
Ok here we go. Im getting a Hasbro FX Luke Skywalker ANH lightsaber with removal blade. At first here the...