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Get rid of batteries on the Fisher-price swing to DC input

We bought a new swing recently and has been consuming 4 C batteries every week. I am wondering if can hook it up to Wall transformer. Any ideas? I have some wall-wart at home that output 6-9v. Can I use them? I can convert the wall-warts as per the instructions here: https://www.instructables.com/id/wall-transformer-for-project-power-supply/

but do i need to change anything in the swing? and how to hook it up?

Please advice ..

Thanks

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NachoMahma7 years ago
. If it uses four batteries, it's probably a six volt system. Shouldn't take a lot of conversion. Just replace the battery holder with a jack that fits the output plug of your wall-wart. Make sure the wall-wart has a high enough current output rating (more than what you need is OK - the swing will only pull as much current as it needs).
sulakhe (author)  NachoMahma7 years ago
Thanks for the reply. Do you think this adapter should be good enough:
http://www.radioshack.com/product/index.jsp?productId=2049709
. 1.8 A should be plenty, but you need to know how much the swing pulls to be sure.
sulakhe (author)  NachoMahma7 years ago
hi, it looks like 1800mA current output wasn't enough. The swing isn't swinging (i can only hear some noise when it tries to but then fails), but it can play music. Is there a way I can increase the output of the current adapter and how can I find out how much the swing actually needs? Thanks.
Im sure you're not using the swing anymore, as this thread is over a year old. But for other's in the same boat as me, ill share my "ible".

I have the exact same swing as the OP, and I was able to find a Nokia wall-wart kicking around which is 5.9V @ 800mAh. The swing runs perfectly fine with everything running at full (full swing, tunes at full volume, rotating overhead objects), on this a/c adaptor when I loosely connected the + and - to the battery terminals in the swing...(end of series).
I didn't have a fully charged set of 4 "D" size batteries to test the initial voltage and current draw, but when i was running the Swing with batteries, my multimeter was showing ~0.5amps and of course the volts dropped to about 4ish. These batteries were indeed loosing their charge and the swing was starting to "slur" its tunes and the rest was slowing down.

Im not going to open up swing as the OP did, so i cut a couple pieces of round-stock wood about the same diameter as a "D" battery, and screwed a metal screw into the top (+) end. Then i attached the wall-wart (+) wire to this screw with a U-connector for easy disconnect if i want. I did the same for the (-) side of the swing and just flipped the 2nd piece of wood around to contact the (-) spring.
So now instead of batteries, i've got 2 wood "batteries" in compartment 1 and compartment 4 (Top and bottom end of series). The wire just hangs out under the battery cover, of course. Pretty clean setup.
https://www.instructables.com/id/How-to-Make-AC-Powered-Batteries-for-your-DC-Pow/
https://www.instructables.com/id/Run-any-battery-powered-item-through-AC-power./
https://www.instructables.com/id/Convert-a-Baby-Swing-from-Batteries-to-AC-wall-P/
https://www.instructables.com/id/Add-an-AC-adapter-to-a-battery-powered-device/
. You can't really get more power out of a power supply unless you start swapping parts. Ie, not feasible. . All I can find out is that alkaline C cells are rated at ~8000 mAh. What that means as far as instantaneous current, I don't know.
sulakhe (author)  NachoMahma7 years ago
thanks for the reply. In fact the swing uses 4 D batteries, not C as I had thought before.
kelseymh7 years ago
There are two different Instructables that cover exactly this issue! There's mine https://www.instructables.com/id/Add_an_AC_adapter_to_a_battery_powered_device/ which is pretty generic, and then there's this one https://www.instructables.com/id/Convert-a-Baby-Swing-from-Batteries-to-AC-wall-P/ which documents exactly the project you're trying to complete.

I think if you had done a search for "baby swing AC" you would have found it.
sulakhe (author)  kelseymh7 years ago
Thanks for your reply. I had seen your post after which I went ahead and bought a 6v adapter and tried to plug it in to the swing (I used alligator leads with boots) and connected them to the springs in the battery box) . Somehow it is not working. The music and an overhead toy work, but the swing doesn't seem to work My question is, is there anything I can do to identify the problem. Thanks for the other link, it is exactly what I am trying to do, and theoretically what I did is exactly same as what is explained in the link. But it just doesn't work. Do you think the adapter should be a regulated adapter?
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