I purchased this adapter after receiving a Beaglebone Black credit card-sized computer as a present, since the BBB's don't come with one. It is the appropriate voltage and connector size for it if you want to operate one without connecting it to the USB port of the computer. Since this hadn't been vetted (as far as I knew) by anyone for the BBB's I wanted to do some testing before connecting it to my board. For a test setup I used high wattage resistors to draw various loads while measuring the output voltage with a digital multimeter. My first observation is that there is a lag time (1 -2 secs.) before the voltage comes up. I am viewing this as a positive, since it allows the regulating / switching components to stabilize before applying power to the output (I didn't look at it on an oscilloscope... but the meter never displayed a reading above the voltage it regulated at). And this does appear to be a high-efficiency switching supply since it never really became warm under load. Moving on the the measurements, my observations were:
No load ----5.23V dc with ~2mV of ripple
~.5 A ----5.20V dc with < 1mV of ripple (can't measure less than 1mV ac on my meter)
~1 A ----5.10V dc with < 1mV of ripple
~1.7A ----5.00V dc with < 1 mV of ripple
Since the BBB uses 5 volts only as a source to regulate down to lower voltages, the amount of regulation is way more than adequate. I did not test it all the way up to 2 amps since it is not a good idea to operate a supply all the way at its upper limit. Based on the measurements I took, I would feel confident that it would still be at least 4.9 V at that load. If I really wanted to use it right at 2 amps (its maximum rated capacity) I would make that measurement first, however. So far, I have used it for several hours straight on my BBB without a hiccup. I had tested another wall wart that I had on hand that was rated at 5V and 2 amps, and found that its output drooped to less than 4 V at only 1 amp. That is what prompted my purchase of this one.
In my opinion, this supply is about as good as it gets for a wall wart. You are going to get some amount of voltage drop over the long cord since the voltage regulation takes place back inside of the supply body. Only thing I would change is I would have liked for the cord to be the kind that is more flexible with a thicker, round sheath. The cord in the picture seems to depict that, but the actual cord is a kind of thin zip-cord. I would have paid 50 cents or a buck more for that. So a little bit of caution might be in order if you are disconnecting / reconnecting this supply a lot and winding it up in between. Try to keep it as straight and smooth as possible (smooth meaning don't let it get twisted up... try to do this anyway with any wall wart supply), and it will probably last as long as whatever you are powering will last. (In other words, try to wind the cord in a loop, don't just ball it up.)
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This item: iMBAPrice® 5V DC Wall Power Adapter - 5.5mm x 2.1mm plug 2A(2000mA) UL Listed Power Supply (5-Feet, 5V 2A(2000mA))
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This Item  iMBAPrice® 5V DC Wall Power Adapter - 5.5mm x 2.1mm plug 2A(2000mA) UL Listed Power Supply (5-Feet, 5V 2A(2000mA)) |  |  |  |  |  | |
| Price | $7.99 | $7.99 | $9.99 | $7.97 | $11.99 | $5.69 |
| Delivery | Get it as soon as Monday, Sep 2 | Get it as soon as Wednesday, Sep 4 | Get it as soon as Friday, Aug 30 | — | Get it as soon as Friday, Aug 30 | Get it as soon as Monday, Sep 2 |
| Customer Ratings | ||||||
| Sold By | AmaMax (USA) Since 1993 l iMBAPrice® Authorized Distributor | Waysse-US | TOBWOLF | Byjieyi-US | Allover Power | GUOHONGZHAN |
| connector type | Barrel Connector | Barrel Connector | Barrel Connector | Barrel Connector | USB Type C, barrel connectors | Barrel Connector |
| number of usb ports | 0 | 0 | — | — | 1 | — |
| compatible devices | CCTV Cameras, Routers, Modems, Clocks, Printers, LED Lights, Cordless Phones, Set-Top Boxes, Wireless Devices, and POS Machines are compatible with this adapter. | Cellular Phones แตงč | Cameras, Printers | WS2812B WS2811 LED strip lights,Wireless Router, Security Cameras, Speakers, video baby monitor, mini fan, electrical toys | 5v 2a power adapter, Speakers，Cameras, Tablets, Monitors, Smartphones | Cameras |
| input voltage | 240 volts | 240 volts | 240 volts | 240 volts of alternating current | 120 volts | 120 volts |
| connector gender | male to male | female to female, male to male, Male-to-Male | female to female, male to male, Male-to-Male | DC | Male-to-Female, DC-to-USB, barrel connector | male to male, Male-to-Male |
| power source | Corded Electric | Wired Appliances | Corded Electric | Corded Electric | Corded Electric | Corded Electric |
| specification met | UL | — | — | UL, CE, FCC | IEEE 802 3 | CE, FCC |
| output voltage | 5 volts | 5 volts | 5 volts | 5 volts of direct current | 5 volts | 5 volts |
| frequency range | 60 hertz | 60 hertz | — | 60 hertz | 60 hertz | 50-60Hz |
| current rating | 2 amps | 2.0 amps, 1.6 amps | 2 amps | 2 amps | 2 amps | 2 amps |
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Victor Manuel De la Torre Lopez
todo
Reviewed in Mexico on September 7, 2023Size: 4.9 Foot (Pack of 1)Verified Purchase
Mario
Works according to info
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Ms. Putli Sharma
Quality
Reviewed in India on September 27, 2018Size: 4.9 Foot (Pack of 1)Verified Purchase
Daniel Varela
Correcto
Reviewed in Mexico on August 19, 2023Size: 4.9 Foot (Pack of 1)Verified Purchase
YouBOU
works fine
Reviewed in Canada on September 16, 2022Size: 4.9 Foot (Pack of 1)Verified Purchase
