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Old 01-23-2011, 04:06 AM #33
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Default Re: Stripping a benq dw1620

First this is just the same as the email I sent you but I did both in case you checked one before the other.

Hi, yeah thats the one I was talking about. I think it uses lm1117 although I could not tell you for sure. Also, you will notice in the diagram it has a current regulator (also known as a potentiometer), this is used to adjust the current going to the laser diode. To test the current you will need a multimeter and a test load. I have added links to the multimeter I use and a good looking test load. You'll find more instructions on testing the current on the other links I gave you on the forum. And so you know, this driver should fit inside a module easily, all you will need to do is solder the diode to it and solder leads to the batteries. The website with the testload also sells good cheap modules.
I hope i've helped and if you're still confused feel free to email whenever



New LCD Digital Voltmeter Ammeter Ohm Multimeter DT830B (eBay item 250541801815 end time 27-Jan-11 18:20:58 AEDST) : Industrial
Laser Diode Driver Test Load KIT *MUST HAVE* [Stonetek_RKCSTR_TL] - $10.99 : StoneTek Electronics, Your Laser Parts Store


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Old 01-23-2011, 08:28 AM #34
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Default Re: Stripping a benq dw1620

For first build I'd advise against using potenciometers, Alf.

There is a simple way of setting the current for your driver - solder one fixed resistor.
Current output is determined by resistance between OUT and ADJ pins. How do you achieve that resistance is not exactly important (fixed resistor, or trimmer).

You can calculate the current you need and put one resistor and call it done.

Formula for that would be :
1.25 / Current desired in Amperes = Resistance in Ohms.

Don't put miliamperes there. If you need, for example, 100mA, don't put 100 , put 0.1 .
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Old 01-24-2011, 01:50 AM #35
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Default Re: Stripping a benq dw1620

True, but personally I've always liked using potentiometers for some reason, no idea why I just like them.
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Old 01-24-2011, 02:02 AM #36
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Default Re: Stripping a benq dw1620

Quote:
Originally Posted by Eudaimonium View Post
LM1117 is almost EXACTLY the same as 317, except for one difference which is the voltage dropout. You see LM317 has around 2.5V of drop (possible more), where as LM1117 has one half of it.
I'm excited to give this a shot - 1.25V voltage drop?

Would this be an appropriate model?
10pcs AMS1117 LM1117 1.2V 1A Voltage Regulator SOT-223 - eBay (item 260700746167 end time Jan-28-11 18:25:36 PST)
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Old 01-24-2011, 07:41 AM #37
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Default Re: Stripping a benq dw1620

No, they are 1.2V fixed, you need adjustable version:
50pcs LM1117 AMS1117 1.2 1.5 1.8 3.3 ADJ selectable LDO - eBay (item 280420722083 end time Feb-01-11 00:52:43 PST)
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Old 01-24-2011, 07:45 AM #38
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Default Re: Stripping a benq dw1620

thanks!

This is the same thing right?
(without the need to buy 50x)

10pcs AMS1117 LM1117 ADJ 1A Voltage Regulator J - eBay (item 160489761980 end time Feb-02-11 18:43:33 PST)
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Old 01-24-2011, 09:45 AM #39
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Default Re: Stripping a benq dw1620

Obviously so. I'd still get 50 pieces if I were you, one can never have enough of those things. $10 is not a lot for 50 LM regulators, free shipping too.
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Old 01-24-2011, 03:23 PM #40
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Default Re: Stripping a benq dw1620

Ok - You've sold me on 50x. So what, if anything, do we loose over the LM317?

There's a max limit of 1A, versus 1.5A on the LM317. That's the only major disadvantage I could see. But if you needed more than 1A, you could run 2x LM1117 setups in parallel right?
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Old 01-24-2011, 03:29 PM #41
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Default Re: Stripping a benq dw1620

Exactly.

Those are SMD variants and are limited in dissipating heat, so that's why they are advised to be ran at 1A maximum.

If you need more than 1A then you're not looking for linear SMD ICs anyhow.
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Old 01-24-2011, 03:37 PM #42
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Default Re: Stripping a benq dw1620

Cool -

Any experience making drivers with the LM358? I've noticed a number of commercial drivers using this IC, and it IS available in a DIP package.
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Old 02-14-2011, 10:42 AM #43
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Default Re: Stripping a benq dw1620

Here I am again, driver board has arrived and I should be ready to compose a working laser.
Here is what I got: and I'm equipped with a solder and a voltmeter, I have yet to clean the back of the diode from the leftout metal.
Also the driver seems a little different from the one I have ordered a month ago, is it ok in your opinion?
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Old 02-14-2011, 02:05 PM #44
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Default Re: Stripping a benq dw1620

It would seem that the board is not properly cut. Just remove the leftmost side of it, where there are no components, I see a cut there, it's just that it didn't snap. Should not be too difficult.

Back of the diode? If there is no excess solder, and nothing is bridged together, you don't have to worry about it.

What specifically do you need help with?
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Old 02-14-2011, 03:58 PM #45
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Default Re: Stripping a benq dw1620

Well, the driver won't fit in the axis module I think, even if further cut. But that's not a big problem, I think.
Then I'll have to solder two wire to the diode and two for a battery, am i right?
Also about the driver, will I have to fix the current as previously said?
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Old 02-14-2011, 04:23 PM #46
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Default Re: Stripping a benq dw1620

Yes - you will still need to set the current, with a test load attached.
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Old 02-14-2011, 04:29 PM #47
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Default Re: Stripping a benq dw1620

Well, I don't have one, can't I use a voltmeter?
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Old 02-14-2011, 04:31 PM #48
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Default Re: Stripping a benq dw1620

Also, you will not need to cut any wires for diode. Just simply solder it to the diode as it should be, pads on PCB are physically made to fit the diode in right order.

And yes, current will need to be preset. You have a test load?
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