Hobbyist Power Supply
Lately, I've been looking for a high voltage, high amperage power supply to test a notebook computer. But the local Radio Shack store doesn't even sell a high amperage power supply. It has a few discrete variable power supplies rated at 1.5 A, but that's about as high as it gets. I'm looking for something up to 3 amps. The only power supply that Radio Shack store has rated at 3 amps was a 12 volt power supply, far short of the 16 volts I need.
But I just found the Kensington 33197-RR Certified REFURBISHED 120 Watt Notebook AC/DC Power Adapter for $19.99. (Normally notebook power supplies costs about $60 and up. I am quite surprised to find this one at $20. It's a steal.) It's an universal notebook power supply that works on many brands of notebook. If you ever look at notebook power ratings, you'll see that the voltage and amperage varies greatly from one notebook to another. even if the notebook is the same brand. Here are some examples:
Acer TravelMate 331T: 19V, 2.4A
So, I would assume that if an universal power supply is to work with all these notebooks, it's gotta be able to automatically switch between a wide range of voltage and provide at least 5 amps of current. Now, wouldn't that make an ultimate hobbyist power supply?
I just ordered two of them. Will let you know how they turn out in my experiments.
Looks like it's going to take a while before they get here. I ordered it on the 11th (Sunday). It got shipped on the 13th (Tuesday). And it's estimated to arrive on the 19th (Monday)!
I got the Kensington universal notebook adapters. They look very nice; very thin. They are definitely auto-switching between different voltages. They can output 0-24 VDC at 0-6.5 A. It has detachable cables all around. And even include car DC adapter. A LED on top indicates that the unit is getting and producing power.
The only problem, it didn't include any tips. It is suppose to include these tips: N1, N2, N3, N4, N9, N14, N15, N19, N27, N29, N30. That is unfortunately, because the DC output has 5 pins, I have no clue what pin does what. Anyone has a pin-out spec?
Here is a photo of the Kensington 33197 Universal Power Supply.
Here is the power specification for the power supply.
2 October 2011
This may be a little late, but this link clues you in:
Basically, the red, white and blue wires connect to a resistive voltage divider
Which pin is which wire? I don't know. You'll have to cut the cable or do a
Thanks. That is very interesting read. Too bad the article didn't identify red, white and blue wires. It would have been nice if it explained how came up with these resister values and how he knew what wires to attach them to.
Came across your article. Trying to do the exact same thing. You ever figure this out?
http://digitaldiy.io/articles/electronics/general/447-kensin . . . in case anyone was still interested in this.
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