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Groover, I'm currently planning to build this. May I know how what is the rating for the external power supply you used?
You might be able to raise the voltage by sizing up the circuit but as the batteries can only supply very little power I don't think you would be able to do anything much with it. Maybe emergency lights? (Check https://www.instructables.com/id/Make-a-SUPER-Joule-Thief-Light/)
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