Lithium Ion Battery to AA form factor (Improved Modular Version) (with f3d)
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Lithium Ion Battery to AA form factor (Improved Modular Version) (with f3d) I improved on the design to separate the voltage regulator components to easily charge the battery module. I salvaged the battery from a discarded e-cig. Used a couple of diodes to drop the voltage to what the electric tooth brush needed. And the electric tooth brush is now working with a Li ion battery. The voltage drop or modification will obviously vary from application to application. IMPORTANT NOTE: Your electric tooth brush / or any other device might have different specs and power requirements. Please do your own calculations and test accordingly when creating the circuit. I can't be responsible for any damages.
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