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

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Price: $4.99 & 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
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This item is available because of the Add-on program
The Add-on program allows Amazon to offer thousands of low-priced items that would be cost-prohibitive to ship on their own. These items ship with qualifying orders over $25. Details
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Frequently Bought Together

Wall Adapter Power Supply - 9V DC 650mA + SainSmart HC-SR04 Ranging Detector Mod Distance Sensor (Blue)
Price for both: $10.58

Buy the selected items together


Technical Details

  • Brand Name: NKC Electronics
  • Item Height: 2 inches
  • Item Length: 3 inches
  • Item Width: 3 inches

Product Details

  • Product Dimensions: 3 x 3 x 2 inches
  • Shipping Weight: 3 ounces (View shipping rates and policies)
  • ASIN: B003XZSZWO
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (177 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: July 31, 2010

Product Description

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

Customer Questions & Answers

Customer Reviews

This device seems to work well.
T. Fox
To my surprise two small red wires lay disconnected.....These wires were supposed to be soldered to the back of the prongs that plug into the wall.
Jay
A simple power supply for my netduino and arduino projects.
Andrew Messick

Most Helpful Customer Reviews

69 of 69 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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34 of 34 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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38 of 39 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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28 of 29 people found the following review helpful By P. McWhorter TOP 500 REVIEWER on February 10, 2013
I purchased this for use on the Arduino since Amazon suggested people often purchased this supply for the arduino. It is total junk, and don't waste your money. As others have mentioned, it has too much ripple to be useful. In addition, mine developed a short and stopped working in thefirst week of trying to use it. Save your money, this thing does not work, and does not last.
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22 of 22 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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16 of 17 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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7 of 7 people found the following review helpful By Camper50 on November 24, 2012
Verified Purchase
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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7 of 8 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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