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Wall Adapter Power Supply - 9V DC 650mA

4.3 4.3 out of 5 stars 617 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
Brand ZJchao
Connectivity Technology DC Barrel
Connector Type 2-Pin
Compatible Devices PC
Color Black
Input Voltage 240 Volts
Mounting Type Wall Mount
Amperage 0.65 Amps
Total USB Ports 1
Wattage 5.85 watts

About this item

  • AC to DC power supply
  • 9V 650mA
  • 5.5 x 2.1 mm plug center positive
  • 110 - 240V AC input
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Product Description

High quality switching 'wall wart' AC to DC 9V 650mA wall power supply

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Product information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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Wall Adapter Power Supply - 9V DC 650mA

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Customer reviews

4.3 out of 5 stars
617 global ratings

Customers say

Customers appreciate the value for money of the charging adapter. They mention it's an excellent buy and is perfect for Arduino. However, some dislike the return policy. Opinions differ on functionality, build quality, cord length, power supply, and light level.

AI-generated from the text of customer reviews

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Value for moneyArduino compatibilityFunctionalityBuild qualityCord lengthPower supplyLight levelReturn policy
50 customers mention "Value for money"38 positive12 negative

Customers appreciate the value for money of the charging adapter. They mention it's a great adapter for an Acer laptop and an excellent buy.

"...I still think it was worth the money though." Read more

"...hand, if it did work well, it would be a neat little supply at a reasonable price." Read more

"...Will buy again for this reason, they are inexpensive and appear to be good quality." Read more

"...I receive a 9.0Vdc 1000mA supply, which a much cheaper looking case...." Read more

12 customers mention "Arduino compatibility"12 positive0 negative

Customers are satisfied with the compatibility of the charging adapter with Arduino. They mention it's good for basic projects, great for netduino and arduino, and a nice companion for arduinos. The 2.1mm plug makes it about as universal of a fit. Some say it's an excellent accessory to power the Arduino microcontroller board from AC.

"...but for the price this guy got the job done. plus it can be used for other projects, so it's pretty good." Read more

"this is a great tool for arduino if you have it always in one place. this is also a great tool for any thing that needs to be powered by 9 volts...." Read more

"Great for multiple purposes and the 2.1mm plug makes it about as universal of a fit as you can get for this type of product...." Read more

"Great for an arduino unto setup. Easy to use and you won't have an issue with the connector as it stays in where it should firmly." Read more

165 customers mention "Functionality"102 positive63 negative

Customers have mixed opinions about the functionality of the charging adapter. Some mention it works well, while others say it wouldn't work for its intended purpose and is useless for anything Arduino.

"i bought this for the arduino uno and it works great for the little thing...." Read more

"...I can't say much about the quality of the power, and 650ma will not power an LCD shield, but when I powered my Arduino Uno with it it worked..." Read more

"...It works really great. I'm definitely satisfied with this purchase...." Read more

"I saw some complaints about this power supply. It works fine for me. This isn't meant to be a bench power supply...." Read more

55 customers mention "Build quality"27 positive28 negative

Customers have mixed opinions about the build quality of the charging adapter. Some mention it's well-built, while others say it's poorly made and broke after a few months.

"...Recently took a look at the innards. Build quality is mediocre, many components aren't placed properly...." Read more

"...Will buy again for this reason, they are inexpensive and appear to be good quality." Read more

"This is a very cheaply made, non-regulated, budget (and boy do I mean budget) wall adapter...." Read more

"...Its well made and seems to power my arduino's with no issues noted so far. Beyond that I can't say that it's anything special...." Read more

52 customers mention "Cord length"19 positive33 negative

Customers have mixed opinions about the cord length of the charging adapter. Some mention it's very suitable, while others say it's a bit too short.

"...to move my speaker farther away from the outlet and so it is a bit too short to do that. I still think it was worth the money though." Read more

"...it's a great little power supply, it's small and is easy to just put in your bag and go...." Read more

"...my only thing that I have against it is that it has a shorter cable." Read more

"...exactly what I needed for my Skullcandy speaker dock, the plug ended up being too big. But with a little splicing it works well enough...." Read more

50 customers mention "Power supply"31 positive19 negative

Customers have mixed opinions about the power supply. Some mention it's a great power supply for many applications, while others say it's not enough to keep the GRPS shield alive. They also say the unit only puts out around 1 volt and doesn't increase the power output.

"...it's a great little power supply, it's small and is easy to just put in your bag and go...." Read more

"...I received is not really much like the picture and the power rating doesn't match the spec...." Read more

"...Worst part bout these is the plug orientation. Good on wall outlet, but if you are using a power strip these will take up 3 outlet spaces...." Read more

"...the rated 250mA minimum for Aduinos, making this a viable power source for many applications here, as well." Read more

12 customers mention "Light level"8 positive4 negative

Customers have mixed opinions about the light level of the charging adapter. Some mention the LED glows brightly, while others say the little LEDs on the Arduino didn't light up.

"...It also has a red LED to indicate power on state. Cord length is adequate and cord appears of good quality." Read more

"...an Arduino Uno, but when I plugged it in, the little leds on the Arduino didn't light up, although they do when powered from my laptop over the USB..." Read more

"I Like the red light on the base! Lets you know its working!!..." Read more

"...The unit only put out around 1 volt. The led on it glows brightly but did not put out enough power to make the LED on the board glow...." Read more

11 customers mention "Return policy"0 positive11 negative

Customers are dissatisfied with the return policy of the charging adapter. They mention it's not worth the hassle to return it and doesn't meet Amazon's return policy.

"...Typical devices will need 1.5A or more. Also its difficult to return. If you buy this you are essentially throwing $5 into a black hole...." Read more

"...n't even fit her DVD player and then try to return and it says item is not returnable...." Read more

"the port is too fat to plug into my 9v DC stereo. No return or exchange policy available." Read more

"...And it is NOT RETURNABLE!!!" Read more

Diorama power
5 out of 5 stars
Diorama power
Works perfectly. I bought it to power a diorama I was building using 9v LEDs. With its own power light, it is easy to use and has a reasonably long cord... Perfect!
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Top reviews from the United States

Prescott
5.0 out of 5 stars It Works
Reviewed in the United States on December 27, 2012
Verified Purchase
I haven't checked the voltage level, or hooked it up to an oscilloscope to check for spikes and ripple, so I can't say much about the quality of the power, and 650ma will not power an LCD shield, but when I powered my Arduino Uno with it it worked fine.

I have only used it for a few hours so I can't say much about reliability, except to repeat that so far it works fine.

So far as far as I can tell, it works perfectly.
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Patricia Mora
5.0 out of 5 stars Bueno
Reviewed in the United States on August 5, 2024
Verified Purchase
Funciona bien
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Colleen Lee
5.0 out of 5 stars Awesome!
Reviewed in the United States on December 16, 2012
Verified Purchase
i bought this for the arduino uno and it works great for the little thing. it's a great little power supply, it's small and is easy to just put in your bag and go. just can't get over how small it is, granted there are probably smaller power supplies. but for the price this guy got the job done. plus it can be used for other projects, so it's pretty good.
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TakeCare
4.0 out of 5 stars Works great but a bit short
Reviewed in the United States on June 19, 2012
Verified Purchase
I bought this as a replacement for the one that broke that works on my ladybug2 speakers. It works really great. I'm definitely satisfied with this purchase. The only thing is since I do use it for my speaker, sometimes I'd like to move my speaker farther away from the outlet and so it is a bit too short to do that. I still think it was worth the money though.
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Internet Resident
5.0 out of 5 stars Good supply
Reviewed in the United States on May 13, 2014
Verified Purchase
I saw some complaints about this power supply. It works fine for me. This isn't meant to be a bench power supply. It provides approximately 9V. My application has an on board voltage regulator so if the output has ripple it really doesn't matter. Most applications use an on board regulator. The fact that the center pin is positive is a non issue since with the exception of Radio Shack products I have yet to see anything that doesn't use a center positive. I would recommend this product.
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Raymond Lewis
1.0 out of 5 stars Do not buy for Arduino
Reviewed in the United States on February 4, 2014
Verified Purchase
I clicked impulsively because Amazon said it was frequently bought and it had a 4 star rating, but I should have read the reviews. The item took too long to ship, the packaging is not only wrong (was not in a plastic bag) but the box was smashed. The side of the unit, which does not look like the one on the product page, was scratched up. The unit is labeled correctly, in the voltage and power current level, but the unit does not perform correctly. I sent it back, even though it was only $6, more out of principle than to get my money back.
One person found this helpful
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Chuck Margo
3.0 out of 5 stars Tips and info on these Wall adapters.
Reviewed in the United States on April 3, 2015
Verified Purchase
Purchased these to power guitar pedals without checking pin polarity or reading reviews first, bad move my part. Good news is it is very easy to open these and switch wires to make them the correct polarity. The case is not glued together just squeeze the sides of the larger case and pull apart. 2 tabs on each side unsolder the red an black wires, switch them around, resolder , carefully tuck everything back in and snap case close.
Measured output voltage was 9.32v on one, 9.39v on the other. Plugged them in and so far so good.
Did notice that the circuit board in each unit was built by different companies with different parts and layout.
Worst part bout these is the plug orientation. Good on wall outlet, but if you are using a power strip these will take up 3 outlet spaces.
Overall these seem to be ok for budget 9v power . O...and they are also labeled on the unit as 1000ma but on box they are labeled 650ma.
One person found this helpful
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Kevin K.
5.0 out of 5 stars You want it? You Got it!
Reviewed in the United States on September 9, 2013
Verified Purchase
I bought this to power my Shruthi-1 synthesizer I built. It mates perfectly with that application. Supply is lightweight and again...it works without modification.

If you're looking for this type of DC supply, get this one, end your search, begin the short wait until it arrives at your door. Plug it in, power up...and smile...Then thank Amazon that you didn't have to pay 'Rat Shak' $25 for a power supply that looks hideous.
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