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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



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Old 03-11-2013, 04:39 PM #1
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Default Power supply setting for dummy load

This may be a stupid question but I cant seem to find the answer. How do I set up my power supply to power a driver attached to a dummy load to check current? If this has been answered before please point me in the correct direction as I cant find the answer. I'm tired of blowing things up and want to do this correctly.


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Old 03-16-2013, 12:55 AM #2
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Default Re: Power supply setting for dummy load

Set current to max, set voltage to an acceptable value for the driver.
For example, ~4V if you intend on powering it with a single lithium cell.
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Old 03-16-2013, 12:56 AM #3
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Default Re: Power supply setting for dummy load

So it just pulls as much current it needs from the supply at whatever voltage is set?
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Old 03-16-2013, 01:02 AM #4
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Default Re: Power supply setting for dummy load

Yep drivers run off a fixed voltage and will draw the current they need to operate. In portable builds you are looking to simulate a battery so if you are simulating a single Li-Ion then start with it on 4.2V the fully charged voltage of the cell. You can also check the current on the test load stays constant going down to 3.6V which is the normal battery cycle of a Li-Ion. If it is two li-ions in series you are simulating just double the numbers above.
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Old 04-24-2013, 11:27 PM #5
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Default Re: Power supply setting for dummy load

I'm so glad I found this thread! I'm just waiting till tomorrow to pick mine up from the post! Is there any other tips/advice you're willing to share in using PSU's with our drivers/diodes?
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Old 04-24-2013, 11:30 PM #6
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Default Re: Power supply setting for dummy load

Diodes I recommend cranking the current up and pre setting the voltage and then crank the current back down. Hook up the diode and slowly turn the current back up to what you want to run it at. Drivers I usualy set the voltage to what the batteries would normally supply and it draws what it needs.
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