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Benchtop Power Supply

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TorqueRanger:
Well I am finally getting tired of making lets say some of craziest home power supplies ... I want to make a homemade power supply but I need it to fit in a box just like the µSupply  but plugs into the wall ...The reason is that my work space is my kitchen table and I really don't have a place to store this stuff but a 3 drawer tote .. I have search a around but schematics just plains scare me in the terms of safety and over all quality... I would love to build something like the µSupply but I can't write code from my life and in the end wind up just killing it.. Do you guys know any plans out that will fit in my specs???


Spec
 Through-hole design
Safe
Fit into a small box
0-15 or 20v
3A














Thanks
JAy

IanB:
It may help to direct the replies if we can clarify one or two questions that come to my mind, at least.

Firstly, do you "want to make" or "need to own"? That gets the make or buy question out of the way.

Next, is "small and compact" really important to you? (Sounds like it is.)

Lastly, what about budget? How much are you willing to spend?

If you want small and compact, then a linear supply is likely not going to suit. It will be big and heavy. That would leave you looking at a switch mode supply--not perfect for everything, but good for many things.

Variable voltage switch mode supplies are hard to design and build. Most design guides ask you to pick your output voltage and work backwards. If your output voltage isn't fixed, you get into uncharted territory.

Have you considered one of the variable voltage regulated DC power adapters available as a wall wart? One of those could be really handy in your circumstances.

A more complicated possibility is to use a laptop power brick as the main supply to a linear variable regulator in a separate project box. Most laptop power bricks supply 19 V at 5 A or more. They make ideal isolated supplies in a nice form factor.

TorqueRanger:

--- Quote from: IanB on November 05, 2012, 02:35:46 am ---

Firstly, do you "want to make" or "need to own"? That gets the make or buy question out of the way.
--- End quote ---
Well this would be my first real project that I would like to build but buy is ok too

--- Quote from: IanB on November 05, 2012, 02:35:46 am ---Next, is "small and compact" really important to you? (Sounds like it is.)
--- End quote ---
Size does matter but the size can change but I don't want to be lugging around this big power supply

--- Quote from: IanB on November 05, 2012, 02:35:46 am ---Lastly, what about budget? How much are you willing to spend?
--- End quote ---
What would one of these cost???

--- Quote from: IanB on November 05, 2012, 02:35:46 am ---If you want small and compact, then a linear supply is likely not going to suit. It will be big and heavy. That would leave you looking at a switch mode supply--not perfect for everything, but good for many things.

Variable voltage switch mode supplies are hard to design and build. Most design guides ask you to pick your output voltage and work backwards. If your output voltage isn't fixed, you get into uncharted territory.

Have you considered one of the variable voltage regulated DC power adapters available as a wall wart? One of those could be really handy in your circumstances.
--- End quote ---
I have been doing this for years but it's becoming to much of a pain to use ..

--- Quote from: IanB on November 05, 2012, 02:35:46 am ---A more complicated possibility is to use a laptop power brick as the main supply to a linear variable regulator in a separate project box. Most laptop power bricks supply 19 V at 5 A or more. They make ideal isolated supplies in a nice form factor.

--- End quote ---
I know I have a laptop power supply floating around here some where...
Would this cut down on the size ???
Where would I get plans for the rest????

T4P:
The issue with getting 19V down to let's say at 12V @ 3A can be quite a task to dissipate in a "compact" form factor when using linear
But i got a good one for ya
http://www.ebay.com/itm/ZXY6005-DC-DC-power-module-60V-DC-CCCV-stabilized-voltage-supply-High-Voltage-/180819803054
http://dx.com/p/zxy6005-2-6-dc-dc-60v-constant-voltage-current-regulated-power-supply-module-green-151115
Also remember, this is a step-down which means you can get less than about 18V from a 19V laptop power pack

TorqueRanger:
Anyone one every built one of these and has pics ???
http://tuxgraphics.org/electronics/201005/bench-power-supply-v3.shtml

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