I put a power cord on my electric toothbrush

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Matt Gruber
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I put a power cord on my electric toothbrush

Post by Matt Gruber » Jan 01, 2018 9:34 am

Seems they all have a battery, and i'm tired of charging/changing.
Took an old 15v wall wart and added a step down module (cost $1).
Set it at 1.5v and no more having a battery to run down.
Not much to do here on new years day :)
HNY to all!

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footloose
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Re: I put a power cord on my electric toothbrush

Post by footloose » Jan 01, 2018 9:44 am

Possible to over-volt it slightly, get the choppers extra clean?

Matt Gruber
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Re: I put a power cord on my electric toothbrush

Post by Matt Gruber » Jan 01, 2018 10:58 am

footloose wrote:
Jan 01, 2018 9:44 am
Possible to over-volt it slightly, get the choppers extra clean?
Good Q
with my Oral-B i tried 1.8v and it sounded in pain.
With a battery, as the cell would discharge, it would run fine down to 1.3v, so giving it the full 1.5 seems fast.

Matt Gruber
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Re: I put a power cord on my electric toothbrush

Post by Matt Gruber » Jan 02, 2018 9:26 am

i just ordered 3 more LM2596 https://www.ebay.com/itm/272420115364?_ ... noapp=true
i'm going to put them on old wall warts for bench testing whatever.
all i did was hot glue the lm2596 on to the wart.
the limited power from the wart should work as a crude current limiter. at .82 each, not much to lose.

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footloose
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Re: I put a power cord on my electric toothbrush

Post by footloose » Jan 02, 2018 12:47 pm

Less than a dollar each delivered to your door, that is pretty amazing.
Seems like a genuine good deal.
And if they don't work out for some reason, what's that line about lottery tickets from old blues song?
Something like "...figured I wouldn't mind the losing, cause it only cost a buck."

Matt Gruber
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Re: I put a power cord on my electric toothbrush

Post by Matt Gruber » Jan 23, 2018 2:51 pm

so i changed my mind and put a $1.32 boost/buck on an old 9v 850ma wart,
so it now has a range of 1.2v to 32v. can do a lot more with a wide range. only drawback is that it wastes 10% extra, doing both boost and buck. i set it on 20v for now, so it could maybe charge a 2p5s makita pack.
.
did get the 3 bucks, and plan to put 1 on an 11 volt wart.
EDIT
put it on an 11v 400ma, and surprise is has a blue LED for ON. amazing for 82 cents!
range goes up to 22v, no load.

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