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Old 10-16-2010, 06:56 AM #1
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Default High Current Test Load Question

Hi, I wanted to ask someone for help on how to build a high current test load. It seems like many of the test loads we have for red and bluray tend to get hot when running above 1 amp. Is it possible to build a test load capable of handling up to a couple amps continuously without overheating? Do I just replace the diodes and resistors with higher current ones?


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Old 10-16-2010, 07:17 AM #2
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Default Re: High Current Test Load Question

I use some 1N540x diodes (3A capability) and a resistor capable of withstanding that kind of power (linked resistor is expensive for a resistor, but is 1 ohm, 3W, 0.5% tolerance). You can buy a lower ohm valued resistor and adjust your calculations as necessary. So if you have a 0.5 ohm resistor and it's a 2W variety it'll stand up to 4A of current.
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Old 10-16-2010, 09:05 AM #3
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Default Re: High Current Test Load Question

Hi. x101xtreme.

I hope this may be helpful..

Dummy load for high current - 2A test load and 3A
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Old 10-16-2010, 10:09 AM #4
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Default Re: High Current Test Load Question

I would suggest using a resistor smaller than 1 ohm though. Lets say you wanted to test with 3 amps: at that point the resistor will drop 3 volts, and dissipate 9 watts. Such resistors are available, and with bit of tolerance not that expensive either. But they do not represent the behaviour of a laser diode that can handle such currents well.

0.5 or 0.33 ohm would be a better choice, but the disadvantage is that you need to multiply the voltage across it by 2 or 3.
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Old 10-16-2010, 10:44 PM #5
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Default Re: High Current Test Load Question

Hey SHIN, do you happen to have a circuit diagram for the test load you constructed? I know that you used these parts:

7 of 1N5404 (3A, 0.7V voltage drop)
4 of 2W 1ohm resister(=1 of 4W 1ohm resister)
1 of 2W 2.7Kohm resister

but I just wanted to make sure how to connect them. Is everything in series? Or are there parts of the circuit which are wired in parallel?
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Old 10-16-2010, 11:24 PM #6
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Default Re: High Current Test Load Question

Or you could just get this resistor here

And these diodes here

Works like a charm
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Old 10-17-2010, 01:25 AM #7
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Default Re: High Current Test Load Question

The circuit diagram was originally from HIMNL9 at this thread:

test load

Thank you. HIMNL9.

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Last edited by SHIN; 10-17-2010 at 01:28 AM.
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Old 10-17-2010, 01:48 AM #8
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Default Re: High Current Test Load Question

Do as you see fit, but 1 ohm of dynamic resistane doent fit wth real life diode current vs voltage graphs. Those constructions were a good match for what the lower powered bluray and red diodes do, but with the 445s its a bit out of line.

Not that it matters much to a good current source though - that'd output the same current regardless of the load, even if that lot is a monkey wrench with croc clips attached
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