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31st July 2012, 07:14 AM
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#1 |
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diyAudio Member
Join Date: Jul 2012
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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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31st July 2012, 08:56 AM
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#2 |
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diyAudio Member
Join Date: Jun 2011
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What input voltage?
What output current? |
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31st July 2012, 09:33 AM
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#3 |
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diyAudio Member
Join Date: Jul 2012
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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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31st July 2012, 02:34 PM
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#4 |
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diyAudio Member
Join Date: Jul 2012
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Looking for the circuit. using L200 or similar IC. LM317?
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31st July 2012, 03:28 PM
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#5 |
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diyAudio Member
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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 jan didden
__________________
/Yes! Its out: Linear Audio Vol 5! I'm not an "accademic", just a plodder who loves a challenge - Ian Hegglun Last edited by jan.didden; 31st July 2012 at 03:31 PM. |
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31st July 2012, 04:05 PM
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#6 |
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diyAudio Member
Join Date: Jul 2012
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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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31st July 2012, 09:12 PM
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#7 |
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diyAudio Member
Join Date: Aug 2010
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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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1st August 2012, 01:11 AM
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#8 |
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diyAudio Member
Join Date: Oct 2003
Location: Ottawa, 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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1st August 2012, 11:42 AM
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#10 |
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diyAudio Member
Join Date: Jul 2012
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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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