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How can I convert 5V (USB) to 3V to replace two AA batteries in series?

The LEDs seem to need ~16.33 mA. Along with @Neil_UK's answer, this gives that this situation needs a 2 V / 0.01633 A = ~122.45 Ohm resistor
BiomedicalEngineeringStudent's user avatar
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How can I convert 5V (USB) to 3V to replace two AA batteries in series?

My knowledge on this is a little rusty. What kind of resistor do I need to put in there? There are 10 LEDs. I'm pretty sure they are in parallel.
BiomedicalEngineeringStudent's user avatar