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Old 11-20-2012, 05:49 PM #1
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Arrow Ebay adjustable current LM2596 power supply

Hey, I found this on ebay and i'm thinking about buying it.

I think i can run any diode using this supply since I can adjust the max current on it.

Have you ever tested this? Do you think it will work?

LED Voltage and Current Display LM2596 DC DC Step Down CC CV Adjust Power Supply | eBay

--- EDIT ---

78 readed and no answers, I guess it's not a good idea to use this to run LDs...


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Last edited by luccax; 11-21-2012 at 05:34 PM.
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Old 11-22-2012, 12:20 AM #2
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Default Re: Ebay adjustable current LM2596 power supply

Bump
Don't you haver any comments about it?
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Old 11-22-2012, 12:24 AM #3
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Default Re: Ebay adjustable current LM2596 power supply

Try this thread, Cheap and Neat - Adjustable CC/CV DC to DC Driver Module
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Old 11-22-2012, 12:26 AM #4
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Default Re: Ebay adjustable current LM2596 power supply

Quote:
Originally Posted by luccax View Post
Bump
Don't you haver any comments about it?
My comment is this.................
It is a step down switching power supply.

We don't know the output noise ripple of the
supply or how it behaves.

Perhaps you could purchase it and test it on
an oscilloscope or test it using a few Laser
Diodes to see if the ripple will blow the LDs...


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Last edited by lasersbee; 11-22-2012 at 12:27 AM.
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Old 11-22-2012, 12:32 AM #5
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Default Re: Ebay adjustable current LM2596 power supply

I just bought it for testing. Too bad i don't have an osciloscope. Once it arrives ill try to find a lab of engineering at my university, mine has only bacterias, useless for testing a psu.
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Last edited by luccax; 11-22-2012 at 12:37 AM.
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Old 11-22-2012, 03:45 PM #6
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Default Re: Ebay adjustable current LM2596 power supply

I have one, I feed him 25V and it gives up to about 23V.
The precision is Ok, I can't measure ripple. I've tested many pen lasers with that one.
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Old 11-22-2012, 04:08 PM #7
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Default Re: Ebay adjustable current LM2596 power supply

That voltage drop is expected. I'm worried about output current peaks that can burn my precious m140s
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Old 11-22-2012, 04:12 PM #8
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Default Re: Ebay adjustable current LM2596 power supply

I have put it on a voltmeter, and it doesn't move at all. But for more precise readings oscilloscope is needed.
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Old 11-22-2012, 04:18 PM #9
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Default Re: Ebay adjustable current LM2596 power supply

yes, when mine arrives ill try to use an osciloscope at one of my university's lab. The problem is I study medicine and i'll have to find an engineering lab, but i'm certain i'll be able to do it.
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Old 11-27-2012, 04:14 AM #10
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Default Re: Ebay adjustable current LM2596 power supply

is this a learning exercise or are you trying to run a laser? there are already cheaper modules than that to be had, and they work just fine.
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Old 01-25-2013, 08:55 PM #11
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Default Re: Ebay adjustable current LM2596 power supply

Quote:
Originally Posted by luccax View Post
yes, when mine arrives ill try to use an osciloscope at one of my university's lab. The problem is I study medicine and i'll have to find an engineering lab, but i'm certain i'll be able to do it.
Any updates?
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Old 01-26-2013, 07:38 PM #12
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Default Re: Ebay adjustable current LM2596 power supply

luccax;

The supply should work fine for supplying a given laser diode or charging a Lithium ion cell.

However, if you make frequent adjustments,

the pots (variable resistors) will get more difficult to set.

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