Old 08-07-2014, 01:49 PM #49
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Quote:
Originally Posted by alessnilsen View Post
1975? Wow! Those things are old! For my searches, it support up to 35A.
Do what ! 1975 isn't old ! I might be an antique. But I'm in the prime of my life. Now there is a sad thought

I thought it looked familiar. I'm going to keep my eye open for one. I'm around a bunch of industrial equipment that converts alternating current to direct current.

"Here`s your problem, your rectifier is missing." Lmao !


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Old 08-08-2014, 03:49 PM #50
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Default Re: 1A LM317 driver with current selection switch

Yeah! I have a big capacitor dated 1987, is a bit old, a Siemens 16000uF 50V from a Elebra Emilia PC.
It's a cute big heavy capacitor that I use to make some sparks when I'm bored. It's a good filter cap for those antique diodes!

Here is a preview of my laser without the laser:



I done some modifications on the driver, I added a big output cap, from 4,7uF to 220uF, it will reduce the switch contact bounce effect a lot!
I added too two 104 ceramic caps, one at input and other at output, to filter the high frequency noise from the SMPS.

I was thinking, what is a good value of capacitor to put in parallel with the LD? I think a 104 will be fine, but I'm not sure.

Just waiting for the module/heatsink and the laser diode arrive!

The heatsink is a piece of 3,3cm X 3,3cm X 5cm, I don't know if is enough for 1W.



If not, I'll adjust the current of the LD to match the heat dissipation.

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Old 08-08-2014, 04:01 PM #51
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Default Re: 1A LM317 driver with current selection switch

If you parallel LM317 regulators , its best to add 0.2 Ohm resistors in series after the current set resistor and before the load , it helps keep things happy apparently .

I did the same to get 20A CC from 20 LM317 regulators in parallel :P
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Old 08-08-2014, 05:35 PM #52
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Glad your project is coming together
It's a lot more fun building everything yourself. I hope my DigiKey order shows up today and I don't have to work this weekend.

I've been spending a bunch of time at TI`s site, they have some really cool design tools for regulators then you can export the design to Eagle.
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Old 08-11-2014, 01:43 AM #53
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Default Re: 1A LM317 driver with current selection switch

Here is a pic of the LM338 I was telling you about ! Told you it is worth a laugh
Looks like Mickey Mouse !


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Old 08-12-2014, 04:17 PM #54
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Default Re: 1A LM317 driver with current selection switch

That's not too bad!

I still waiting for the laser diode + heatsink to arrive, all the other stuff is already assembled.

I never seen a 445nm laser.
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Old 08-12-2014, 05:21 PM #55
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Thanks. I thought it was pretty bad. It was just a test. But it works.
Hope your parts show up soon, that's part of the fun, collecting pieces.
I like the 445`s. The entire 400 range is my favorite. The closer it gets to Teal the more I like it.
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Old 08-12-2014, 11:28 PM #56
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Default Re: 1A LM317 driver with current selection switch

445nm seems a great color, I only have seen 405nm and is a wonderful color!

I finished mounting all the stuff into the wood board, here is the result:




What do you think? It will be like my computer sound amplifier mounted into a MDF board, the manutention is very easy.


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Old 08-13-2014, 04:10 AM #57
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Default Re: 1A LM317 driver with current selection switch

I think you made it look like a nice clean installation. Good for you for taking pride in your work
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Old 08-23-2014, 04:03 PM #58
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Default Re: 1A LM317 driver with current selection switch

Today I received the LD:





Now I'm thinking, should I test it now? The heatsink don't arrived yet.

----------

I tested it, 445nm is a beautiful color!



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Old 08-23-2014, 05:40 PM #59
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Default Re: 1A LM317 driver with current selection switch

Please be aware that your wrist strap is 100% useless unless you ground it with a cord.
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Old 08-23-2014, 05:53 PM #60
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Default Re: 1A LM317 driver with current selection switch

Thanks for the advice! I touched a ground wire before touching the LD.

Those wireless wrist strap are useless, I'll attach a cord on it!
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Old 08-24-2014, 08:35 AM #61
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Default Re: 1A LM317 driver with current selection switch

Also, not a good idea to post your full name and
address in a public forum, especially when you are
holding very expensive devices.
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Old 08-24-2014, 01:47 PM #62
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Default Re: 1A LM317 driver with current selection switch

My mistake, already corrected!

Thanks!

----------

Another question, Is all OK with the RAW output of my LD? I know that's is multi mode, but it looks a bit "hairy" with spurious emissions around the main beam (you can see the entire diode aperture with little vertical beams).



----------

Tested again! NICE color!

At 285mA:


At 1A:

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Old 08-29-2014, 02:55 AM #63
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Default Re: 1A LM317 driver with current selection switch

Is best to drive this LD with 1A or 800mA? I think that the difference of output power will be compensated by the longer lifespan.

I'll drop the low output from 285mA to 175mA, I see that at 285mA it produces a lot of light, when in this mode I only wan't a pointer. The lasing threshold is at 150mA, when cold, it lases, but after a few seconds the lasing process stops and it start to produces LED light, is interesting to view this. Because of this I will drive it at 175mA, that's enough for it.
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Old 08-29-2014, 06:25 AM #64
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Default Re: 1A LM317 driver with current selection switch

That output looks similar to what I have seen
coming out of multimode diodes.

Make sure you are grounded at all times when
working with laser diodes. I have blown
diodes before just touching something
grounded and then going to work.

Even at 1A, it is underdriven and should last
quite a long time.

http://redlum.xohp.pagesperso-orange...ta/NDB7412.pdf
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