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Old 09-20-2008, 09:43 AM #993
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Default Re: DIY Homemade laser diode driver

Adjusting a 1k pot in the low ohms area is going to be hairy.....I will try to find the drawing I did that shows the problem, I think it is on my work computer....will post it later..

Regards rog8811

[edit]Found it, the arrow shows the angle of turn required for 100ohms to zero ohms on the two pots, I hope it helps visualise the "fine setting" problem[/edit]
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DIY Homemade laser diode driver-turning_pot01_001.jpg  


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Old 09-20-2008, 04:27 PM #994
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Default Re: DIY Homemade laser diode driver

Thanks for the diagram.

Ok so technically if i am operating my laser at 420ma then i wouldn't have to have a variable potentiometer if i am using a 3 ohm resistors. I don't plan to change the output at anytime.
So how would i hook up the circuit without the pot ?
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Old 09-22-2008, 03:44 PM #995
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by trublu832
Here's yet another version of the driver for a HD DVD laser with an lm317, a 25ohm pot, a 33ohm resistor,a 1N914 diode, and a 10uf cap. I'm also working on an SMD version of this board which will make this one look like a skyscraper *
I built this driver exactly to these specs for my HD DVD 405nm but I can't get it to the desired output power. I've tried tinkering with the componet set up and I believe it's the regulator. I'm giving it 3 x 3.6V, maybe I need to give it more voltage for the blu-rays? The pot works as it should, but just not the power I get from the rckstr. :-/
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Old 09-22-2008, 04:46 PM #996
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Default Re: DIY Homemade laser diode driver

Quote:
I built this driver exactly to these specs for my HD DVD 405nm but I can't get it to the desired output power.
What is the max ma out you can measure from it Ace? Also have you measured the ref voltage to see if the reg is doing what it should?

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Old 09-22-2008, 05:12 PM #997
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Default Re: DIY Homemade laser diode driver

The max mA is ~65 and no, I haven't measured the reg voltage. *Should I measure the output or the adjustable out? It should be 7.8 volts right?

Edit: over a year old and almost 1,000 replys, nice thread DDL!
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Old 09-23-2008, 04:16 PM #998
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Default Re: DIY Homemade laser diode driver

The second post on this thread.... http://www.laserpointerforums.com/fo...1197651171/0#0 ..... shows where to measure the ref voltage, no matter how you set the pot you should get 1.25v anything other than that voltage and there is something wrong.

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Old 09-23-2008, 05:43 PM #999
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Default Re: DIY Homemade laser diode driver

Hey Rog, thanks for your persistance. *I did read that thread and I find it most helpful. * I'm using the 1N4001 not the 1N914, could that make that much difference? *
I see the input voltage is LD + 3, and then I see "6 for red & 9 for br" of coarse, that's including the +3 so the diode really needs 3 for red and 6 for br right? *That being said, I'll run the tests and make sure that everything is as it should be. *Thanks Rog, you never fail. *

Edit, I think I found the problem. I hooked up the pot per attached picture (in green) which I think could cause the problem.
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Old 09-23-2008, 05:50 PM #1000
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Default Re: DIY Homemade laser diode driver

*Got it...I tried for the 500th post and failed....got the 1000 though *


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Old 09-23-2008, 06:08 PM #1001
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by rog8811
*Got it...I tried for the 500th post and failed....got the 1000 though *


Regards rog8811
What if I delete one of my prior posts, will that make yours 999 and this one 1000?

Just kidding, you deserve it!

So what you think, that pot set up be my problem? What about the diode?
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Old 09-23-2008, 06:23 PM #1002
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Default Re: DIY Homemade laser diode driver

Quote:
So what you think, that pot set up be my problem? What about the diode?
Sorry I got lost in the moment
If the diode you are asking about is the reverse protection one I would doubt it is the problem....unless you have it the wrong way round :-/ ....why not remove the diode from the circuit and test again?

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Old 09-23-2008, 06:37 PM #1003
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by rog8811
Quote:
So what you think, that pot set up be my problem? What about the diode?
Sorry I got lost in the moment *
If the diode you are asking about is the reverse protection one I would doubt it is the problem....unless you have it the wrong way round *:-/ *....why not remove the diode from the circuit and test again?

Regards rog8811
Hey, You put in lots of repeatitive work around here helping us nonelectronicexperts here suceed! I did try removing the diode from the circut, and it acts the same. Did you see my attachment in the previous page where I connected the pot opposite how it should? I'll try it later the correct way, or is that not the problem? ;D (I just felt like laughing)
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Old 09-23-2008, 06:58 PM #1004
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Default Re: DIY Homemade laser diode driver

Quote:
I hooked up the pot per attached picture (in green) which I think could cause the problem.
Yes just seen the edit... the only effect that your wiring of the pot will have is that it will reverse the resistance....

Let me try that in English
If you wire the wiper (in green) to one end of the pot turning the knob clockwise winds the resistance higher, wire the wiper to the other end of the pot and winding the pot clockwise takes the resistance lower so not the problem..... one thing to check, does the positive line to the LD come from the the adj pin of the regulator, it is easy to think it comes from the out (middle) pin.

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Old 09-23-2008, 09:31 PM #1005
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Default Re: DIY Homemade laser diode driver

Yes, in that case I've done everything right. I even thought of that avenue as well. hum, keep trying. I've built two and both act exactly the same. I'm sure I'll figure it out.
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Old 09-24-2008, 03:03 AM #1006
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Default Re: DIY Homemade laser diode driver

I had the same problem when I built my DDL driver. Turns out I had
misswired the pot and the regulator somehow. It took several reviews of
the diagram before I finaly figured it out. Just keep lookin it over and I am
sure you will find the problem.
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Old 09-24-2008, 07:29 PM #1007
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Default Re: DIY Homemade laser diode driver

Ace, could you post clear pictures of both sides of your circuit board, in the past we have been able to sort out the problem that way.

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Old 09-25-2008, 02:52 AM #1008
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by rog8811
Ace, could you post clear pictures of both sides of your circuit board, in the past we have been able to sort out the problem that way.

Regards rog8811
Of coarse I will.
But, I must make another, since the two I've made has been experimented with isn't so pretty. I'll go for the 3rd. I will post pictures.
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