What available on the market was really not portable. Either you had to connect to a battery strap or DC transformer. The circuits are embedded inside the frog of the bow.
My build uses a button battery to power the LEDs. It has a lifetime of about 4 hrs per battery which is ideal for musicians who is performing on stage or shooting with it.
I am working on changing the illumination colors and intensity in response to the pitch, expression of playing.
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