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Old 31st July 2012, 07:14 AM   #1
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Default DC-DC variable voltage and current lab power supply

Hi, looking for simple DC-DC variable voltage and current lab power supply circuit. variable voltage (around 3 to 12 volts) and variable current. (current limiting with LED indicator) Also I will add digital voltmeter and ammeter module. Regards, BT
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Old 31st July 2012, 08:56 AM   #2
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What input voltage?
What output current?
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Old 31st July 2012, 09:33 AM   #3
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input voltage is around 12 volts (I have small smps with 12v / 2amp output) Now I want a dc-dc simple circuit for the following output voltage mainly between 3-9 volts. output current 0-2 amps (with limit and led indicator) I will add voltmeter and ammeter BT
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Old 31st July 2012, 02:34 PM   #4
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Looking for the circuit. using L200 or similar IC. LM317?
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Old 31st July 2012, 03:28 PM   #5
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There are 3A versions of the LM317, I believe the type # is like LM337?
There will be app circuits for what you want in the data sheets.

Edit: try LM350T

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Last edited by jan.didden; 31st July 2012 at 03:31 PM.
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Old 31st July 2012, 04:05 PM   #6
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thanks. I am not getting the right circuit voltage & current limit with current over limit indicator. Could you or some one please send me one. BT
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Old 31st July 2012, 09:12 PM   #7
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Each one of these pdf’s has a power supply with voltage and current adjust.

http://www.zlgmcu.com/on/ds_ldo/LM350-D.pdf
Fig 21.

http://www.ti.com/lit/ds/symlink/lm350-n.pdf
Page 11.
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Old 1st August 2012, 01:11 AM   #8
macboy is offline macboy  Canada
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Why build when you can buy it so cheaply these days? What you want will cost you about $15 on eBay; how many hours will you spend designing and building it? And how much money for parts? Don't get me wrong, I enjoy DIY and that's why I am here and why we are all here. At some point though I decided to stop building tools so I could focus on the 'real' projects. That's just me. If you want to build a power supply, build it.

Try searching eBay for "DC Buck Converter Constant Voltage Current Voltmeter Ammeter". It isn't a finished product, you'll need to supply the DC input power supply, an enclosure, you will likely want nice panel mounted pots for volt/current control instead of the PC mount ones, etc. So it is half a DIY project.
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Old 1st August 2012, 01:42 AM   #9
CBS240 is offline CBS240  United States
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12V-3V=9V; @ 2A that is 18W of heat. Have you considered a buck converter?
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Old 1st August 2012, 11:42 AM   #10
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@macboy Thanks for your reply. If possible send me ebay link which does variable voltage & current with over limit led indicator. @CBS240 I am considering all options. If possible send me info or pointers. Thanks, BT
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