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  • Wall Adapter Power Supply - 9V DC 650mA
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Wall Adapter Power Supply - 9V DC 650mA

by ZJchao
290 customer reviews
| 8 answered questions

Price: $5.49 & FREE Shipping on orders over $35. Details
In Stock.
Sold by zjchao123 and Fulfilled by Amazon. Gift-wrap available.
  • AC to DC power supply
  • 9V 650mA
  • 5.5 x 2.1 mm plug center positive
  • 110 - 240V AC input
2 new from $5.39
$5.49 & FREE Shipping on orders over $35. Details In Stock. Sold by zjchao123 and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

Wall Adapter Power Supply - 9V DC 650mA + Arduino UNO R3 board with DIP ATmega328P + Sunfounder Project Super Starter Kit for Arduino UNO R3 Mega2560 Mega328 Nano
Price for all three: $67.01

Buy the selected items together

Technical Details

  • Brand Name: ZJchao
  • Model Number: zjchao-854
  • Item Package Quantity: 1

Product Description

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


Product Details

  • Product Dimensions: 3 x 3 x 2 inches
  • Shipping Weight: 0.3 ounces (View shipping rates and policies)
  • ASIN: B003XZSZWO
  • Item model number: zjchao-854
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (290 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: July 31, 2010
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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

91 of 91 people found the following review helpful By Dan Checkoway on December 23, 2012
Verified Purchase
Long story short, DO NOT BUY THIS power supply if you plan to use it with an Arduino. I bought it because Amazon listed it as "Frequently Bought Together" with the Arduino that I was buying. Other reviews about the "ripple" are absolutely correct. This power supply was totally unstable for my needs, which is reading values from sensors.

Too bad I can't give this thing ZERO stars!
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38 of 38 people found the following review helpful By Clinton Keith on August 2, 2012
Verified Purchase
This simple power supply failed after two weeks of use. I pulled it apart and discovered that the solder joint that connected the power supply to the AC prong had failed. Talk about a fire hazard! I soldered it back together, but I only use it for occasional testing. I wouldn't recommend this for any long term unattended use.
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44 of 45 people found the following review helpful By Vikingredbaron on February 17, 2012
Verified Purchase
The only good thing it's that it's a small power supply, but unfortunatelly the ripple is very heavy. I don't recommend this product.
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33 of 33 people found the following review helpful By John Jeffers on January 11, 2013
Verified Purchase
Obviously this is a low quality supply and cannot be sold in the US or Canada. It has high ripple and does not carry cULus or cCSAus or cETLus or cTUVus so is NOT APPROVED for SALE in US or CANADA. The supply has a CE mark. I cannot find an IEC-CB certificate for it which would give it the right to carry CE. Needless to say it goes back.
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22 of 23 people found the following review helpful By mattyd on November 11, 2012
Verified Purchase
If you're trying to build a strobe light with LEDs, this is the power supply for you. It has a natural ripple creating a brilliant flicker of the lights you may have in the circuit. However, you cannot turn off this feature so if you're looking for a smooth power source, I suggest looking elsewhere.
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12 of 12 people found the following review helpful By Camper50 on November 24, 2012
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Besides being illegal to sell in most of the US, much less plug in, this could be a fire hazard. At least if your house burns down, You'll know who to turn the Lawyers loose on.
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10 of 13 people found the following review helpful By Roy A Westerberg on April 24, 2013
Verified Purchase
I bought this to power 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 cable. It turned out that the polarity of the power supply was inverted. When I measured with a voltmeter, the center pin of the connector was negative and the outside was positive at +9 volts. The Arduino documentation says that the center pin must be positive. Fortunately, the Arduino seems to still work correctly, so I guess it was not damaged by an upside-down voltage supply.

You can open up the supply by unscrewing the tiny recessed screw and gently working the plastic case apart. I was surprised at how complex the circuit appeared on the tiny board inside. Even so, I am surprised that such a tiny circuit with such tiny wires could supply 650 mA reliably, bearing in mind that a regular 100 watt lightbulb uses less than 1 Amp. I think I may be able to unsolder the wires that go into the cable and resolder them back in the opposite holes, but it will be a delicate operation. Apparently other reviewers did not encounter this problem, so maybe I just got a bad one. On the other hand, if it did work well, it would be a neat little supply at a reasonable price.
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7 of 9 people found the following review helpful By Amazon Customer on April 20, 2013
Verified Purchase
I've only used this supply for a bit and after about an hour of use one of my arduino's is unresponsive and I'm unable to reprogram it and the on board program no longer runs. I don't know that this supply had anything to do with it but I decided to test it's output and instead of being in the neighborhood of 9V, it tested on my multimeter at 11.63V. Although the arduino is rated from 7 to 12 volts, I don't see anyone who recommends running the arduino at it's max voltage for any length of time. Also I'm uncomfortable with how hot this supply runs. Just plugged in with no load it gets fairly warm and needs to be in a place with air. If it was in an enclosed space, I'd be concerned with overheating issues.
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Most Recent Customer Reviews


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