Register to reply

Converting baby swing from battery power to DC adaptor.

Share this thread:
mnshahid
#1
Dec14-13, 06:32 AM
P: 7
I have a fisher price baby swing. It has 4 1.5v batteries of size D. I tried to convert it to a 6v DC charger but that didn't work. The charger specification is output=400mA 2.4VA. If someone can help me please to find a right charger as this doesn't work correctly and swing does not swing as swings with the batteries. Swing becomes more noisy and does not swing.
Phys.Org News Partner Engineering news on Phys.org
DIY glove-based tutor indicates muscle-memory potential
Tricorder XPRIZE: 10 teams advance in global competition to develop consumer-focused diagnostic device
Study shows local seismic isolation and damping methods provide optimal protection for essential computing equipment
skeptic2
#2
Dec14-13, 12:01 PM
P: 1,815
It's likely the swing is drawing current for a quarter cycle or less. If so, the momentary current drain may be over 400 mA. If you have a voltmeter, monitor the voltage while it's running and if you see the voltage drop significantly below 6 V, try a larger charger.
mnshahid
#3
Dec14-13, 12:04 PM
P: 7
Hi
Thanks for the reply. I'm quite a lay man in case of electronics and don't have any mentioned tools to check current. Can you please kindly suggest that what likely be the mA of the adaptor should be. I can open swing to see if any chance there has been anything printed by the swing motor ? Or by some other means Igbo can get help to know about the closest mA that this swing needed please!

skeptic2
#4
Dec14-13, 12:25 PM
P: 1,815
Converting baby swing from battery power to DC adaptor.

I can't think of any other options than getting a larger charger. You may find some wall warts that will supply 1 or 1.5 amps. If that doesn't solve the problem I'd look for another problem like maybe your charger isn't working or it's hooked up wrong.
mnshahid
#5
Dec14-13, 01:22 PM
P: 7
I have also tried charger of out 500mA also 600mA but results are not different than the 400mA adaptor. Should I go beyond the 600mA or less than 400mA? If someone can help me please!
dlgoff
#6
Dec14-13, 02:42 PM
Sci Advisor
PF Gold
dlgoff's Avatar
P: 2,726
You probably need a supply that doesn't have all the a.c. ripple. The ripple is probably causing the noise problem.
mnshahid
#7
Dec14-13, 03:00 PM
P: 7
I tried to search fisher swing that works with DC adaptor and their they mentioned the adaptor having 100mA. Should I try one of similar power?
NascentOxygen
#8
Dec14-13, 11:45 PM
HW Helper
Thanks
P: 5,357
Quote Quote by mnshahid View Post
I tried to search fisher swing that works with DC adaptor and their they mentioned the adaptor having 100mA. Should I try one of similar power?
No, a basic 100 mA adapter will perform worse than the ones you have tried.

Or maybe you meant to type 1000 mA there?
mnshahid
#9
Dec15-13, 05:59 AM
P: 7
Click image for larger version

Name:	ImageUploadedByPhysics Forums1387108759.164383.jpg
Views:	11
Size:	134.4 KB
ID:	64810
NascentOxygen
#10
Dec15-13, 07:22 AM
HW Helper
Thanks
P: 5,357
I think your best course is to use 1 or 2 sets of rechargeable cells, NiMH type. Have one set on the charger while the other is in use.
tfr000
#11
Dec15-13, 08:39 AM
tfr000's Avatar
P: 127
The fact that the product operates on D batteries indicates that it draws a lot of current. Trying to run it on the charger won't work - you would need a real high current power supply. The charger is for charging - at low current. BTW, anything labeled "2.4VA" is outputting AC - "VA" is a rough AC equivalent of DC watts.
skeptic2
#12
Dec15-13, 10:01 AM
P: 1,815
Quote Quote by tfr000 View Post
The fact that the product operates on D batteries indicates that it draws a lot of current. Trying to run it on the charger won't work - you would need a real high current power supply. The charger is for charging - at low current.
True

BTW, anything labeled "2.4VA" is outputting AC - "VA" is a rough AC equivalent of DC watts.
Not true. The charger is labelled for its input requirements, not output. The rating is in VA because the input is to a transformer. If what you said was true, how would the charger charge D cells?
mnshahid
#13
Dec15-13, 01:29 PM
P: 7
I never said that charger is charging D cells but an adaptor to replace batteries.
tfr000
#14
Dec15-13, 07:50 PM
tfr000's Avatar
P: 127
Quote Quote by mnshahid View Post
The charger specification is output=400mA 2.4VA.
Looks like it says output to me.

There are a bazillion types of wall warts. Some of them do indeed output AC. And the quote above does not seem to match the image that was posted.
sophiecentaur
#15
Dec16-13, 05:52 AM
Sci Advisor
Thanks
PF Gold
sophiecentaur's Avatar
P: 12,186
Quote Quote by mnshahid View Post
I never said that charger is charging D cells but an adaptor to replace batteries.
So, when you say "charger" you mean "adaptor", then?
Your average D cell will have about 1AHr in it so if your swing will work with batteries for about 1 Hr, it will be taking 1A. (You could resolve the question with a DMM, of course). You can buy a 6V DC 1A power supply for very few GBP, or equivalent, on eBay. It is important that it should be explicitly marked as a DC supply and that it's connected the right way round. Don't be offended by my pickiness - I have made all those mistakes myself in the past and I always run through the checklist when I connect power to things. Problem is that there are so many varieties of PSU around these days.


Register to reply

Related Discussions
Oscillator / Power Amp circuit voltage swing problem Electrical Engineering 15
Change battery input with a power adaptor Electrical Engineering 8
Converting a Lead Acid Battery to Alkaline Materials & Chemical Engineering 2
Power Swing Problem Electrical Engineering 0
Need help converting battery clock to DC Electrical Engineering 8