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Anyone pushed a M140 beyond 2.0A?

ryansoh3

ryansoh3

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Hi all,

I was wondering if anyone had pushed their M140 diode over the 1.8A zone and onto 2.0A.
Yes, I did my research but I don't think anyone dared to push their precious diodes beyond 1.8A.

I ask this because I'm trying out a new build that uses a 5-mode Buck driver from DX linked here.

sku_106805_2.jpg


I've considered the new 9mm 445's but they seem to be too expensive.

Also, I know there's a great thread about using flashlight drivers, but I'm looking for one that has 5-modes can drive a diode to exactly 1.8A.

Thanks to Dogsbestfriend for helping me out on this project.

Cheers!
 





yobresal

yobresal

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Yes, I have pushed many to 2A. Some of them like the extra current. Others prefer it to be a bit less and you will not get anymore output out of them. Some will even output less at 2A then they do at 1.8A. Really depends on the specific diode you get. Chances are it will not kill it. Just test that driver out first and make sure it isn't putting out like 2200 or 2300mA.
 
ryansoh3

ryansoh3

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Thank you, thank you, and thank you.
That's the exact answer I've been looking for.

Had I been knowledgeable about circuits I would have modded the DX driver to output 1.8A.

How much does the extra 0.2A reduce the duty cycle?

Cheers!
 
jander6442

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If your running the M140 diode that high I would hope you considered a really good cooling method first.
 
ryansoh3

ryansoh3

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jander6442 said:
If your running the M140 diode that high I would hope you considered a really good cooling method first.
Click to expand...

Yeah, I think I'm going to use a moderately large aluminium heatsink (copper's too heavy for a flashlight with a big head) with a really really short duty cycle, about 10-15 sec.

I'm trying to get a 5-mode driver work with the M140 so that it would have long-lasting low and mid power modes.

Thanks for your help. :)
 
offroadfreak8582

offroadfreak8582

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I ordered one for examination. Curious to see if the output is stable and is really 2A

Greetings,,
 
ryansoh3

ryansoh3

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Great! Thanks for testing it.
Hopefully the driver is a functional buck that can power LD's as well.

Tsteele has one ordered as well and is gonna hook it up with his scope to detect any fluctuations or spikes.

Cheers!
 
ryansoh3

ryansoh3

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Blutquell said:
Perhaps you can replace the resistor(s) to yield the desired 1.8A?
Click to expand...

Yup, I thought of doing that, but I don't have an original schematic of the circuit. I think DX or the supplier rub off the chip model number, so it's pretty much a hit or miss.

Thanks for the suggestion though.

offroadfreak8582 said:
I ordered one for examination. Curious to see if the output is stable and is really 2A

Greetings,,
Click to expand...

Offroadfreak, have you gotten your driver yet? I'm dying to know the results!

Cheers! :beer:
 
A

arcaneinsomniac

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Any results? I'm curious. I will likely end up building my M140 with an X-Drive but IMO the most optimal set up is a driver that switches between Low-High on a quick on-off so I can use a reverse clicky to accurately and quickly etch stuff with the laser.

Maybe we could somehow find a driver with AMC 7135x5 for 350mA * 5 = 1750mA driver for this purpose. It would most likely only be capable of low-med-high which I suppose might work okay. Hmm, low-duty-cycle PWM could be interesting too, it would etch dotted lines.

I dunno. It isn't honestly that hard to do it accurately with a regular laser because I can just hold it closer or farther a bit to defocus and then it wont burn. But modes are still cool.
 
ryansoh3

ryansoh3

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arcaneinsomniac said:
Any results? I'm curious. I will likely end up building my M140 with an X-Drive but IMO the most optimal set up is a driver that switches between Low-High on a quick on-off so I can use a reverse clicky to accurately and quickly etch stuff with the laser.

Maybe we could somehow find a driver with AMC 7135x5 for 350mA * 5 = 1750mA driver for this purpose. It would most likely only be capable of low-med-high which I suppose might work okay. Hmm, low-duty-cycle PWM could be interesting too, it would etch dotted lines.

I dunno. It isn't honestly that hard to do it accurately with a regular laser because I can just hold it closer or farther a bit to defocus and then it wont burn. But modes are still cool.
Click to expand...

An AMC based linear driver won't work because the Vf of a laser diode is higher than that of a 3.7-4.2V cell. You can either use two cell configuration (low efficiency due to heat) or a boost driver.

I think lazeerer can get you an X-Drive with mode memory, you should ask him.

I use a cheapie DX buck driver and that has been performing very well with 5-mode memory.

Cheers!
 
Last edited:
ApexProxy

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arcaneinsomniac said:
Any results? I'm curious. I will likely end up building my M140 with an X-Drive but IMO the most optimal set up is a driver that switches between Low-High on a quick on-off so I can use a reverse clicky to accurately and quickly etch stuff with the laser.

Maybe we could somehow find a driver with AMC 7135x5 for 350mA * 5 = 1750mA driver for this purpose. It would most likely only be capable of low-med-high which I suppose might work okay. Hmm, low-duty-cycle PWM could be interesting too, it would etch dotted lines.

I dunno. It isn't honestly that hard to do it accurately with a regular laser because I can just hold it closer or farther a bit to defocus and then it wont burn. But modes are still cool.
Click to expand...


I think a driver with multiple modes is not the best way one could do this. Wouldn't it be easier to place a resistor inline with the positive lead going to the diode and then rig a switch(or foot pedal) that bypasses the resistor thus giving you a default of low output and then hit the switch and kick into high. That way you could theoretically switch modes infinitely fast with no risk of diode damage and its so simple that its not likely to mess up.

Just my two cents.
 
Last edited:
ApexProxy

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For this situation buck is the best option I agree. You could always go with a boost driver if your goal was small size but I am guessing stability, battery life, and longevity are more of a concern.

After this though I am considering grabbing a couple mode drivers to do some testing with. I think a variable power laser would be pretty cool.
 
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