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How would I modify this circuit for battery powered string lights? Answered

How would I modify this instructable to use a string of lights that runs on 2 AA batteries?
https://www.instructables.com/id/Make-Music-Controlled-Christmas-Lights/

I figured it would be a matter of using a different solid state relay but I'm not sure. If it IS just a matter of switching ssr's, any idea what one to use?

Thanks in advance

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You should be fine with the relay used in the original, or even one with a lower voltage rating, as the one in the video is good for 24V, and the pair of AAs will only output 4V.