CD/MP3 player: added AC jack to DC connector probs

Hello,

I have searched all search engines and can't find an answer to my question.

I have a Panasonic SL-SX480 portable CD/MP3 player that is DC only. It takes 2 AA batteries (1.5v for a total of 3v).

I added an AC power input jack by soldering the wires to the positive and negative DC power points on the circuit board (where the batteries connect).

I used a wallwart converter; the CD player wouldn't work at 3v, so I moved the switch to 4.5v and it works fine.

The problem is that now, it won't work with batteries anymore. I have thought about making a battery pack using three 1.5v AA batteries and plugging it into tho AC power input jack I added, but that would make it not as portable as before (if it'd even work).

How do I get the CD player to work with batteries again, and still keep the AC jack?

Sincerely,
Mike C.

Hi spacehg, welcome to the forum.
I hope you will enjoy it here

I'm sorry to admit that I really wouldn't know how to solve that problem.
Unfortunately to me it seems it's either this OR that.
But why is less portability a problem? I mean, it's not that large all together, no?

Did you use a 3-terminal DC jack? Many of them are designed with a pair of switch contacts that open when you plug in the barrel plug from a wall-wart. Usually you'd wire one of the lines from the battery supply through this switch so that it disconnects the batteries when you want to use your wall-wart.