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Wanting to make 5 V USB lens warmers
Does any one know what type and how many, resistors are needed to make some 5 volt USB lens warmers?
I'll run them in parallel and wire them up to USB plugs. Just need to know what resistors to to use and how many. The warmers will run off either a 12v 26A/Hr battery with the USB plugs or from a 5V Li-On battery.
Thanks,
Jim
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