Author Topic: Will this work as a lab powersupply  (Read 1166 times)

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Offline kolbep

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Will this work as a lab powersupply
« on: July 10, 2015, 09:32:47 pm »
Hi
I am looking to get a better powersupply for electronics work.
At the moment I just use Alarm Batteries (7,2AH 12v).
But if something is wrong, or I do something wrong, I either get melting wires, burned, sparks, or components blowing themselves up and flying around the lab.

Sometimes I use a 7805 or LM317 regulator cct, but I dont have anything decent as a CC Source.
I would love one of these fancy supplies Dave has, but money (or lack thereof) is holding me back.
If I get a module like this :
http://www.ebay.com/itm/Digital-controlled-CC-CV-Current-Voltage-LED-Driver-Step-Down-Module-f-Solar-/400729454444?tfrom=400841119167&tpos=top&ttype=price&talgo=undefined

and hook it up to say a laptop powersupply,
will it be any good for occasional use (as CC/CV powersupply)
Do I need CC or Current Limiting more?

Pros and Cons Please.

Thanks
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Online nctnico

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Re: Will this work as a lab powersupply
« Reply #1 on: July 10, 2015, 10:09:22 pm »
I'd get something which resembles a real lab power supply. These are reasonable:
www.ebay.com/itm/New-0-30V-0-5A-Portable-Mini-DC-regulated-Adjustable-DC-power-supply-/151636354846
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Offline cimmo

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Re: Will this work as a lab powersupply
« Reply #2 on: July 10, 2015, 10:41:33 pm »
If you need to keep it cheap, then the pre-build modular approach does work.
Here are some examples:



This module is pretty decent for ~$20

and building it in in a box:


Whatever you do, make sure you get some form of current limiting, it saves a lot of expensive magic smoke release. Obtaining the raw power from a laptop power supply (typically 19v @ 2A) would be a good solution and avoids the hassles/risks of mains wiring.
« Last Edit: July 10, 2015, 10:47:34 pm by cimmo »
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