18v to 12 and 5 most efficient

I am trying to hack an 18 volt drill battery.

I'd like 2 feeds coming off of it,

1) 12 volt 1.8 amp for led lights

2) 5v 2 amp. USB for phone charging

They may or may not be running at the same time.

I am trying to do the most efficient use of power conversion. Do I use a voltage divider circuit with resistors or 2 buck converters? Is there another way, seems like it should be simple. I am a pretty good "maker" but not great at electronics theory.

Any help would be appreciated.

by hiposner
April 07, 2020

I'ld use the two buck converters. They will certainly be more efficient than resister voltage dividers---and the resister approach will probably give more voltage droop under load.

by Foxx
April 07, 2020

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