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I have an idea for an instructable but I don't know where to start...

I recently bought an ilo mp3 player because A) I'm cheap B) I don't need 30gb+ of space... my songs barely take up 2-3gb Anyway, it runs on a single AAA battery which is nice because it keeps the size/weight down but it's inconveniant to have to cart batteries around at all times :/ What I'm wondering is would it be possible to build some sort of AC adaptor that would connect to the battery holder? If so, what sorts of materials would I need?

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chase!!10 years ago
Well, first you'd need an AC transformer to drop the voltage closer to what the player needs (1.5 V). And then you need to rectify to DC. Most likely you could get an adaptor from Radio Shack that will drop the voltage and rectify it. If you can't find an adaptor that outputs 1.5 V (±.15V approx.) then you'll need to construct a circuit to drop the voltage, you can do this with either a voltage regulator, or a voltage divider made of a series of resistors. After you get the proper voltage, you need to get the power to the device. You can do this by connecting alligator clips to the battery terminals or by opening the player and soldering in a power port where the battery terminals connect to the board. Make sure you check that your adaptor can output enough current to power the player. I'd guess most adaptors already can, but you should check anyway. The current draw for devices is usually listed in the battery compartment or on the cover. Also, the standard if you don't know what you're doing ask a friend that does to help you and so on. PS: Is it possible to power that player over USB? I can't tell based on the amazon.com description.
bostrees (author)  chase!!10 years ago
If I had any friends handy who are in the know, I would've asked already :P And I'm not totally sure about that... When connected via USB it automatically turns on and brings up the "USB Connected" screen on the player so obviously it does get power, but I don't know that it would follow that a USB-power-only cable would work.
chase!! bostrees10 years ago
Can you play music back while it's connected?
bostrees (author)  chase!!10 years ago
Sorry for the late reply :P

Dunno, haven't tried. I would now but I'm at work and don't have the cable on hand.

Also, assuming I *could* make some sort of USB charger... will the type of connection on the mp3 plyaer side make a difference? It's shaped kinda like two stacked rectangles, with one wider but shorter than the other one... See if I can't represent it well here:

    ________ __| [pins] |__|______________|
chase!! bostrees10 years ago
That kind of sounds like mini-USB, but if you can pull the battery and it plays music while connected to the computer you're good to go.
bostrees (author)  chase!!10 years ago
...Much longer than three hours >_> I had errands to run, class to attend, etc etc Anyway, what I did was purchased a 1.5 ~ 12v 300mA AC Adaptor from Radio Shack and some aligator clips. Hacked the plug end of the adaptor, stripped the ends of the wires, and twisted the strands onto the aligator clips (did this just outside the store so QaD had to suffice :D) It worked, but it's not an ideal solution. Would it be possible (with some creative cutting of plastic) to take a AAA size battery holder and make an "adaptor" of sorts? By which I mean the AC adaptor wires would be soldered/aligator clipped onto the batter holder which would be modified in such a way as to fit inside the battery compartment of the player? I'd prefer to not open the player because I'm looking towards a more temporary solution than adding a power port to the player and ruining it's sleek shell >_>
chase!! bostrees10 years ago
You probably could hack together a battery connector, but it might be easier to create a fake battery using a tube or something and contacts on the ends that are connected to the adaptor, that way you could just pop in the "battery" and things would work for you.
It'd probably be easier to use a wooden dowel with contacts on both ends. You can have the wires taped around the dowel to prevent them from being pulled off.
bostrees (author)  chase!!10 years ago
That's what I was thinking, especially since it's a multi-volt adaptor--power remote controls, GameBoys, ANYTHING with batteries :D Now to just make a pretty case and remember to take pics WHILE I do it instead of afterward >_>
bostrees (author)  chase!!10 years ago
Sorry for the double post but I forgot to add that while connected via USB it doesn't let me play music. Possibly because data wires and not just power are connected?
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