Convert a Baby Swing From Batteries to AC (wall) Power
Intro: Convert a Baby Swing From Batteries to AC (wall) Power
Are you tired of changing the batteries in your infant/baby swing?
This instructable covers how to convert your baby swing to wall power, so you can just plug it in and not have to change the batteries.
It's designed so that you can choose wall power or batteries, depending on your needs.
This Instructable requires soldering--There are other instructables covering that if you need help learning.
This instructable covers how to convert your baby swing to wall power, so you can just plug it in and not have to change the batteries.
It's designed so that you can choose wall power or batteries, depending on your needs.
This Instructable requires soldering--There are other instructables covering that if you need help learning.
STEP 1: Tools & Parts Necessary
Tools
Screwdriver(s)--Used to open up the motor/switch/battery housing
Wire Stripper/Cutter--Used to cut and strip the old and new wiring
Soldering Iron--Used to solder the new switch and wires to the existing wiring
Heat gun or Cigarette Lighter--Used to melt the heatshrink tubing
Parts
5 VDC Power Supply--I used an old cellphone charger. It needs to have a similar voltage output to the batteries in your swing. Count the batteries in your swing. Each one puts out 1.2VDC (Whether AA, C, D, ect). Obviously 9V batteries are a different animal. Mine used 4 "D" batteries, so I needed at least a 4.8VDC power supply.
Double Pole Double Throw (DPDT) Switch--A small one from Raido Shack, etc. is fine.
Solder--Used to secure the new wiring
Heatshrink Tubing--Used to protect the solder joints
Epoxy or Super Glue--Used to secure the switch to the housing
Screwdriver(s)--Used to open up the motor/switch/battery housing
Wire Stripper/Cutter--Used to cut and strip the old and new wiring
Soldering Iron--Used to solder the new switch and wires to the existing wiring
Heat gun or Cigarette Lighter--Used to melt the heatshrink tubing
Parts
5 VDC Power Supply--I used an old cellphone charger. It needs to have a similar voltage output to the batteries in your swing. Count the batteries in your swing. Each one puts out 1.2VDC (Whether AA, C, D, ect). Obviously 9V batteries are a different animal. Mine used 4 "D" batteries, so I needed at least a 4.8VDC power supply.
Double Pole Double Throw (DPDT) Switch--A small one from Raido Shack, etc. is fine.
Solder--Used to secure the new wiring
Heatshrink Tubing--Used to protect the solder joints
Epoxy or Super Glue--Used to secure the switch to the housing
STEP 2: Disassemble the Swing
The goal here is to get access to the wiring from the batteries to the motor. The exact technique will vary depending on manufacturer of the swing, but most of the time you you have to remove a number of screws. This will allow you to split the plastic housing of the swing to gain access to the wiring.
I had to remove about 10 screws in order to accomplish this. The picture shows the plastic housing split apart, and the battery box, and wiring visible.
There should be two wires leading from the battery box, a red wire and a black wire. This is the positive (red) and negative (black) power for the motor/sounds/etc.
Cut both of these wires. I chose to cut them equally distant from the battery box and the circuit cards for the motor. This gave me several inches of wire to hold onto when soldering, which is very helpful.
I had to remove about 10 screws in order to accomplish this. The picture shows the plastic housing split apart, and the battery box, and wiring visible.
There should be two wires leading from the battery box, a red wire and a black wire. This is the positive (red) and negative (black) power for the motor/sounds/etc.
Cut both of these wires. I chose to cut them equally distant from the battery box and the circuit cards for the motor. This gave me several inches of wire to hold onto when soldering, which is very helpful.
STEP 3: Build Up the Switch
Take your DPDT switch and and solder approximately 4" long wires to the six switch leads. Once your solder has cooled, slide heatshrink tubing over the solder joints and shrink the tubing with a heat gun or lighter. I used a cigarette lighter since I don't have a heat gun.
The center two positions will be connected to the motor side wiring in the swing. One side of the switch contacts will go to the battery box wiring, and the other side will go to the new power supply.
The positive wires should be on one side of the switch (left or right), and the negative wires should be on the other side.
It does not matter which side goes to what power source, as long as the middle contacts go to the motor.
The center two positions will be connected to the motor side wiring in the swing. One side of the switch contacts will go to the battery box wiring, and the other side will go to the new power supply.
The positive wires should be on one side of the switch (left or right), and the negative wires should be on the other side.
It does not matter which side goes to what power source, as long as the middle contacts go to the motor.
STEP 4: Cut Hole in Housing for Switch
Lay out the size of the hole necessary to accomodate your switch and then remove that material.
I chose to drill the corners of the area with a small drill bit and then use a razor blade (multiple passes) to cut between the holes to make my rectangular cutout. I cheated and used my Dremel tool a bit, but the razor blade method works fine as well.
I chose to drill the corners of the area with a small drill bit and then use a razor blade (multiple passes) to cut between the holes to make my rectangular cutout. I cheated and used my Dremel tool a bit, but the razor blade method works fine as well.
STEP 5: Prepare Power Supply
I had an old Motorola cell phone charger with a similar (slightly) higher voltage.
Cut the cell phone connector end off, and strip back about 3/8" of the insulation to expose the copper wire.
Carefully separate the stripped ends and plug the charger into the wall. Using your multimeter, touch the red lead of your meter to one wire, and the black lead of the meter to the other wire. If the meter displays the correct voltage of the power supply (say 5.0 volts), then mark the wire the red probe is touching as the positive wire. I used masking tape to do this. If your meter says (-5.0 volts), then the wire the black lead is touching is the positive lead. Mark it as such.
You will need to figure out how to run the power supply wires through the plastic housing of the swing in order to connect them to the switch. I chose to drill a hole on the bottom of the swing, near the battery box. Drill a hole just large enough to fit the wires through. The tie a simple knot (overhand) in the power supply wiring on the inside of the housing to provide strain relief for the wiring. You DO NOT want the solder joint to be pulled on when someone trips over the wiring, etc.
Cut the cell phone connector end off, and strip back about 3/8" of the insulation to expose the copper wire.
Carefully separate the stripped ends and plug the charger into the wall. Using your multimeter, touch the red lead of your meter to one wire, and the black lead of the meter to the other wire. If the meter displays the correct voltage of the power supply (say 5.0 volts), then mark the wire the red probe is touching as the positive wire. I used masking tape to do this. If your meter says (-5.0 volts), then the wire the black lead is touching is the positive lead. Mark it as such.
You will need to figure out how to run the power supply wires through the plastic housing of the swing in order to connect them to the switch. I chose to drill a hole on the bottom of the swing, near the battery box. Drill a hole just large enough to fit the wires through. The tie a simple knot (overhand) in the power supply wiring on the inside of the housing to provide strain relief for the wiring. You DO NOT want the solder joint to be pulled on when someone trips over the wiring, etc.
STEP 6: Connect the Wiring
Now its time to connect the switch wires to the motor wires, battery wires, and power supply wires.
Be sure to slide heatshrink tubing on the wires and push it away from the joints prior to soldering them. Once the joint has been soldered and is cool, slide the heatshrink tubing over the joint and shrink it with your heat gun/lighter.
Push the switch through the hole you've created and connect the switch wires to the appropriate wires--battery box, power supply, and motor.
I stripped the wires back about 1/2" inch and then "hooked" them together. (see picture). Basically I bent the stripped ends into a "U" shape and connected the "U"'s together. I then soldered them together. Note the white heatshrink tubing on the red wire. Once the joint is soldered, that will be pulled down and shrinked over the joint.
You will need to do this for all six wires.
Be sure to slide heatshrink tubing on the wires and push it away from the joints prior to soldering them. Once the joint has been soldered and is cool, slide the heatshrink tubing over the joint and shrink it with your heat gun/lighter.
Push the switch through the hole you've created and connect the switch wires to the appropriate wires--battery box, power supply, and motor.
I stripped the wires back about 1/2" inch and then "hooked" them together. (see picture). Basically I bent the stripped ends into a "U" shape and connected the "U"'s together. I then soldered them together. Note the white heatshrink tubing on the red wire. Once the joint is soldered, that will be pulled down and shrinked over the joint.
You will need to do this for all six wires.
STEP 7: Reassemble and Test
Reassemble the housing and reinstall and tighten the screws that you removed.
Place the batteries in the unit, and plug the power supply into the wall.
Turn on the swing (with the switch in either position) and see if it works normally. Push the new switch the other direction and make sure it works normally.
I then glued the switch into the housing using epoxy (in the first picture it's under the masking tape, being held in place while the epoxy cures).
You can unplug the power supply and then determine which direction the switch has to be in for the power supply to power the swing motor.
Label the switch accordingly.
Enjoy not having to buy batteries!
Place the batteries in the unit, and plug the power supply into the wall.
Turn on the swing (with the switch in either position) and see if it works normally. Push the new switch the other direction and make sure it works normally.
I then glued the switch into the housing using epoxy (in the first picture it's under the masking tape, being held in place while the epoxy cures).
You can unplug the power supply and then determine which direction the switch has to be in for the power supply to power the swing motor.
Label the switch accordingly.
Enjoy not having to buy batteries!
117 Comments
TonyJ84 5 years ago
WrenchingPilot 5 years ago
A higher current power supply should solve the issue.
Aprilrose1981 5 years ago
WrenchingPilot 5 years ago
Hey April, my guess would be that the adapter is not supplying enough amperage for the swing. Does the transformer (wall wort) list the amperage it supplies next to where it says 5.5 VDC?
DanielW350 5 years ago
Used a 6v
Fisher price swing
With a Fisher price plug
But when it gets under load the lights pulse
I just put crimp ends and pushed into the battery terminals
So one could go back to batteries
If they wanted
prasad2312 7 years ago
hi am Prasad,
I have made a water level sensor which is basic though and previously it was running on 9v dc battery ,and so the started draining in 2 days,so if I want to supply or power my circuit on wall current what will I have to do
WrenchingPilot 7 years ago
I don't know how much amperage your water level sensor draws, but a 1000mah 9 VDC power supply should be good.
Fortunately, these are easy to source. Here's one on Amazon: https://www.amazon.com/PigHog-PP9V-Power-1000ma-Supply/dp/B00JU9V7I6/ref=sr_1_9?ie=UTF8&qid=1490184065&sr=8-9&keywords=9+vdc+power+supply
Get one like this, cut the connector off, separate the positive and negative wires, and connect this to your water level sensor in lieu of the batteries.
AnthonyM226 7 years ago
hello, need some help.
I have an outdoor motion light in my drive way. it's using 4
C battery’s, and would like to get a wall adapter. What voltage adapter should I
get? I can get one that change from 3, 5, 6, 8, 10, or 12.
Thank you in advance.
-Anthony Mendonca
WrenchingPilot 7 years ago
Hi Anthony.
Do you know if your light uses LEDs? If so, it's most likely 5 volts, so use a 5 volt charger.
joshuaperry 8 years ago
Thanks for making this instructable! After reading it through, I gathered the courage to mod our old D-Cell only baby swing with a 5v AC adapter. Feels good man. Cheers!
vietn13 8 years ago
great idea and very useful,
ocnhochimto 8 years ago
That's amazing idea. i enable me to save money of battery replacement. Thanks
http://batterychargersexpert.com
JasonD20 9 years ago
red side of the plug onto where the last batteries + side**
JasonD20 9 years ago
Like this
nickolai.borba 9 years ago
I just did this and it works great. Thank you for the great idea. Not too hard.
laguera 12 years ago
I have this exact swing and the same exasperation with the repeated purchase of "D" batteries!
I do not know how to solder, however, so I probably won't try this at home. :-/
I have never seen a baby swing with an AC adapter and all the hand-me-down swings we got are battery operated. I looked for swings with AC adapters in local (Pittsburgh) stores and found none. My sisters actually didn't believe that they existed, and they almost had me convinced. We figured there had to be a law against them, because who would want a battery powered swing if plug-in swings were available?
Are you listening, Fisher-Price?! (Probably not. Sigh.)
TheBatSub 9 years ago
Great instructable, but for those non-techies who read this and don't want to walk away feeling discouraged from trying it, I'd suggest taking a look at the Batsub TooL (www.batsub.com). It makes doing this kind of stuff a snap, for both the techies and non-techies.
santhony5 12 years ago
It's a shame that they don't make both options.... It's probably a "safety" issue with having a corded product... they have to go through UL certification I think.. or something probably like that..
dapperbac 12 years ago
amyewing462 9 years ago