Old 11-23-2015, 08:55 AM #1
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Default Is this driver good?

Hi all, I'm new here, I build my own cnc laser engraver with a Nichia NDB7875 445nm 9mm Laser Diode, 2.5W rated to a max of 2.5A and I'm looking for a good, stable and cheap driver for the laser. Is this one good for me?

http://pages.ebay.com/link/?nav=item.view&id=331280958905&alt=web


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Old 11-23-2015, 09:12 AM #2
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Default Re: Is this driver good?

No it is not, that appears to be a voltage regulator, not a constant current regulator, laser drivers provide constant current and adjust voltage as needed to provide constant current. Using that is the same as using no driver at all, you may as well connect your diode to some power supply or batteries without a driver, and that's not a good idea because it won't last long. Use a real laser driver, not a voltage regulator.

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Old 11-23-2015, 09:39 AM #3
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Quote:
Originally Posted by Pi R Squared View Post
No it is not, that appears to be a voltage regulator, not a constant current regulator, laser drivers provide constant current and adjust voltage as needed to provide constant current. Using that is the same as using no driver at all, you may as well connect your diode to some power supply or batteries without a driver, and that's not a good idea because it won't last long. Use a real laser driver, not a voltage regulator.

Alan
Thanks for the quick reply Alan, can you suggest me something else, or if I build one from a LM317 voltage regulator, 1N4001 diode and 2 resistors of 10 ohms?

What about this one?
http://pages.ebay.com/link/?nav=item.view&id=111788124570&alt=web

Last edited by Danielmarius; 11-23-2015 at 09:43 AM.
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Old 11-23-2015, 10:44 AM #4
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Default Re: Is this driver good?

Quote:
Originally Posted by Danielmarius View Post
Thanks for the quick reply Alan, can you suggest me something else, or if I build one from a LM317 voltage regulator, 1N4001 diode and 2 resistors of 10 ohms?
Well if you build your own from a LM317 the resistor needs to be about 1 to 1.1ohms, these can only do a max of 1.5A so you would need two in parallel and that can be done but I don't really recommend a linear driver for a laser of that power, they can accept a wider range of voltage but will get hot easily if the voltage isn't just right.

Also I don't recommend 2.5A, keep it to 2.2A - 2.4A, that diode can decrease in power above 2.2A although generally 2.4A is the safe level. I have a laser I built with that diode and am driving it at 2.2A with this driver:
Survival Laser Driver
That driver though is for a flashlight style host so it's maybe not be the right one for you. Have a look here:
https://sites.google.com/site/dtrlpf...drives/x-drive
DTR also sells on eBay and Amazon. Or look here:
http://laserpointerforums.com/f39/x-...ost-88589.html
But if you need something with modulation then someone else will have to advise you.

Alan
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PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
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Old 11-23-2015, 11:07 AM #5
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Quote:
Originally Posted by Pi R Squared View Post
Well if you build your own from a LM317 the resistor needs to be about 1 to 1.1ohms, these can only do a max of 1.5A so you would need two in parallel and that can be done but I don't really recommend a linear driver for a laser of that power, they can accept a wider range of voltage but will get hot easily if the voltage isn't just right.

Also I don't recommend 2.5A, keep it to 2.2A - 2.4A, that diode can decrease in power above 2.2A although generally 2.4A is the safe level. I have a laser I built with that diode and am driving it at 2.2A with this driver:
Survival Laser Driver
That driver though is for a flashlight style host so it's maybe not be the right one for you. Have a look here:
https://sites.google.com/site/dtrlpf...drives/x-drive
DTR also sells on eBay and Amazon. Or look here:
http://laserpointerforums.com/f39/x-...ost-88589.html
But if you need something with modulation then someone else will have to advise you.

Alan
Thanks Alan, I'll have a look on those, although a TTL driver would be more suitable for me
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Old 11-23-2015, 05:23 PM #6
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Default Re: Is this driver good?

Quote:
Originally Posted by Danielmarius View Post
Thanks Alan, I'll have a look on those, although a TTL driver would be more suitable for me

https://innolasers.com/shop/index.ph...roller=product
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Old 11-23-2015, 05:26 PM #7
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That's perfect. Thanks!
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Old 11-23-2015, 06:39 PM #8
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Default Re: Is this driver good?

Quote:
Originally Posted by Danielmarius View Post
That's perfect. Thanks!
No problem! DTR's site also has a section specifically for laser engraving, so you may find some useful products there!
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473nm | B&W Tek BWB-10-OEM |
488nm | Spectra Physics 163 Argon | ~30mW Metered |
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515nm | PL515 Pen Build | 50mW | >>Build Thread<<
520nm | Laserlands 520 5mW | 3mW Metered | Review Unit | >>Review<<
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Old 12-02-2015, 02:30 AM #9
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Default Re: Is this driver good?

The drive you are looking at is voltage regulator. You need a current regulator for laser diode.

Last edited by Hibro; 12-02-2015 at 02:32 AM.
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