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Old 08-22-2014, 04:44 PM #1
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Default M140 Test load

Hello, I need help with my DIY test load.. Im going to use this schematic

That Ive found in some another topic... I just dont know what diodes and resitor do I need to make it... I need to set the current at 1.8A for my m140 diode with SL-SD-3 driver.


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Last edited by niiii; 08-22-2014 at 04:45 PM.
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Old 08-22-2014, 05:40 PM #2
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Default Re: M140 Test load

Personally I would ditch the resistor and just use an ammeter.

For the diodes just use any regular si rectifier diode with a Vf of about 0.7V. Make sure they are rated for the current you'll be putting into them.

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Old 08-22-2014, 05:53 PM #3
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Default Re: M140 Test load

if im gonna ajdust driver 1.6 - 2.3A to 1.8A can I use diodes rated at 3A?
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Old 08-22-2014, 06:06 PM #4
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Default Re: M140 Test load

Yup, 3A diodes would work fine.
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Old 08-22-2014, 06:13 PM #5
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Default Re: M140 Test load

aaaand if I dont use the resistor it will look like the first schematic or the second in the picture
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Old 08-22-2014, 07:44 PM #6
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Default Re: M140 Test load

Try the first one....
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Old 08-22-2014, 07:52 PM #7
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Default Re: M140 Test load

The top one, voltage is measured in parallel, current is measured in series.

Don't forget to stick your meter into amps mode.
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Old 08-22-2014, 09:29 PM #8
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Default Re: M140 Test load

thank you guys
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Old 08-22-2014, 09:58 PM #9
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Default Re: M140 Test load

make sure your meter is in amps mode, and that you use the 10A setting and the 10A banana sockets. Most meters will blow their fuse if you use the normal voltage sockets, as they are fused at ~250mA, while you'll be measuring current closer to 1800mA.
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Old 08-23-2014, 07:32 AM #10
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Default Re: M140 Test load

Ive found this diodes rated as 3A, but vf is about 1.2V... can I use them?
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Old 08-28-2014, 04:02 PM #11
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Default Re: M140 Test load

It drops 1.2V when 3A flowing through it. It will drop less voltage if you are sending less current through it, you can probably assume 0.9V per diode at 1.8A.
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Old 06-26-2015, 01:47 PM #12
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Is it true that a zombie m140 would be a good test load I heard that even though the diode will only look like a dim led it still pulls the same current.
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Old 06-26-2015, 01:59 PM #13
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Quote:
Originally Posted by dregalado331 View Post
Is it true that a zombie m140 would be a good test load I heard that even though the diode will only look like a dim led it still pulls the same current.
Zombie m140? Define it

Btw, the last post is more than half a year ago. Start a new thread instead of bring this thread up again

Last edited by marcuspeh; 06-26-2015 at 02:00 PM.
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Old 06-26-2015, 02:10 PM #14
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Quote:
Originally Posted by marcuspeh View Post
Zombie m140? Define it
I apologize for the terminology but I have failed once or twice on a build and the m140 would throw a good beam but because of overheating k or over feeding I killed the diode resulting in a glow but not a beam this has happened to not only the 140 but the lpc823 twin can and the 405nm diodes
They just glow but the current draw is the same ,,,,I was told they do get hot I suspect that the heat is the result of the current instead off the light so that is why they are zombie diodes because when they are good and really dead they don't light up at all
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Old 06-26-2015, 02:20 PM #15
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Default Re: M140 Test load

Yes, That IS a zombie. you are correct (to the best of my knowledge).
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Old 06-26-2015, 02:25 PM #16
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We ll I am not proud to say I have ac few zombies and if I don't improve my building techniques ill be on the next Walking Dead episode.
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