Re: Help - I need a design for a 6 volt, 700 mAmp dc power supply

On Apr 28, 9:13 am, Chris <cfoley1...@xxxxxxxxx> wrote:
On Apr 28, 7:19 am, jcsealock <jcseal...@xxxxxxxxx> wrote:

I want to build a sturdy, portable dc power supply to plug into my MP3
player that has issues with charging its internal battery. It works
just fine with the AC/DC adapter but want my player to be "portable"
again.

Since I'm just now learning basic electronics I would rather build a 6
volt, 700 mAmp power supply powered off of one or more rechargeable
batteries than wait until I know enough to repair the mp3 player (if
ever).

Any pointers/designs anyone wants to share?

Thanks.

Hi, JC. If you can take apart the mp3 player, you should be able to
replace the internal battery. It's very likely that's where your
basic problem lies. But most small mp3 players are meant to be
disposable, so getting it apart and successfully putting it back
together might be really tough.

Given that, a quick fix might be to put five "C" or "D" size Ni-Cad
batteries in series to give you your portable 6VDC (5 X 1.2V ea.).
That should keep you rolling.

Good luck
Chris

Hi, Chris.

Thanks for the tip.

I've acutally been making repairs like that for a while on this unit
and I've had it apart and together a few times. (and it shows). The
battery hasn't been the problem. The problem for this unit is that
the internal works that do the charging aren't doing what they should
and I don't have the know-how to fix that issue - Currently, I'm just
able to find loose or broken connections and resolder them.

If it is a simple as putting some together in series, that's great. I
figured I would also have to control/adjust the amperage. Are amps
constant when batteries are connected in series?

Thanks again.
John

.

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