AAA Battery Eliminator

[[email protected]]

I have an MP3 player that takes one (1) AAA Battery. I was wondering
if there was anything out there that could replace this with an AC
adapter of some sort? Or if I could somehow make one. I have seen
several things about 2 AAA batteries, but not just one. Would I just
need a 1.5V power supply? Has anyone done this or have a good idea of
how to do it?


Thanks for the help.

Craig

 

[Kryten]

I have an MP3 player that takes one (1) AAA Battery.

Me too. They don't last very long do they?

I was wondering
if there was anything out there that could replace this with an AC
adapter of some sort? Or if I could somehow make one. I have seen
several things about 2 AAA batteries, but not just one.

Would I just need a 1.5V power supply?

Well yes, of course.

Though you can't go very far with it plugged in.

I was thinking of wiring mine up to a single D cell.

A lot better value for money.

Has anyone done this or have a good idea of
how to do it?

An ordinary LM317 adjustable regulator can regulate down to 1.25V.

 

[[email protected]]

I was planning on just getting a regulated AC-DC Adapter from Radio
Shack or somewhere. Since it does not have an input on the player, I
was just going to make a "plug-in battery." Does anyone see any
problems with this design?

-----------
| AC | _____________
| DC |------------|---------------------|
|_____| |____________|

Where the picture on the right is a dowel hollowed out with a wire in
it, and two screws on both ends to make the contact with the battery
contacts. The AC-DC adapter would be set at 1.5 V (Regulated). Do I
need anything else or does anyone see a problem with this?


Thanks,

Craig

 

[John Popelish]

I was planning on just getting a regulated AC-DC Adapter from Radio
Shack or somewhere. Since it does not have an input on the player, I
was just going to make a "plug-in battery." Does anyone see any
problems with this design?

-----------
| AC | _____________
| DC |------------|---------------------|
|_____| |____________|

Where the picture on the right is a dowel hollowed out with a wire in
it, and two screws on both ends to make the contact with the battery
contacts. The AC-DC adapter would be set at 1.5 V (Regulated). Do I
need anything else or does anyone see a problem with this?

If the adapter is rated for at least the current used by the device
and you don't install the dummy battery backwards, it should work.

 

[Mac]

I have an MP3 player that takes one (1) AAA Battery. I was wondering
if there was anything out there that could replace this with an AC
adapter of some sort? Or if I could somehow make one. I have seen
several things about 2 AAA batteries, but not just one. Would I just
need a 1.5V power supply? Has anyone done this or have a good idea of
how to do it?


Thanks for the help.

Craig

If you want to get all fancy, you can measure the Voltage across the
battery when the player is running. Then set your regulator to that
Voltage, whatever it is.

--Mac

 

[Kryten]

Where the picture on the right is a dowel hollowed out with a wire in

it, and two screws on both ends to make the contact with the battery
contacts.

You can buy dummy batteries, e.g:
http://www.maplin.co.uk/Module.aspx?ModuleNo=261&TabID=1&WorldID

Although they might be harder to find in AAA size.