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Old 05-07-2009, 04:34 AM #1
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Default Setting diode on driver and dummy load

I've been trying to find answers to my questions the past few days with no success.
First of all how do I use a dummy load? I've managed to assemble the circuit but I have no idea where the power supply should be hooked up. I don't know how to simulate a test load. The information does not go into enough enough detail.



Next question, why can't I get the driver that I've set up to to receive any power output? The power supply won't supply it. My guess is what I did with the diode's pin here is the top.



Here is the bottom of the driver.




This is the best picture I could get but I try to follow directions.The positive pin is soldered below the LD on the driver. The negative pin above the GD on the pad. Problem was I had to twist the pins to do this. The right pin broke off. That's my guess. As to what's wrong but I'm not sure. It be that the pin are not straight on he diode.With other builds I notice people have their diodes soldered to the driver completely straight.

It's a normal diode 5mW nm 635. I'm planning on putting it in a didla host this, is merely a test build for me. I feel like I'm very close yet missing something important. Any help would be appreciated! Pressing the diode is extremely tricky as well.



Last edited by laser83; 05-07-2009 at 06:03 PM.
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Old 05-07-2009, 10:18 AM #2
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People have a tendency to get too close to small objects when they try to take a picture. Stay farther away.
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Old 05-07-2009, 11:18 AM #3
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Speaking of detail, we can't see anything in those photos. So it'll be hard to help you.
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Old 05-07-2009, 02:21 PM #4
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I have an old camera too, that's 90% of the problem. Ignoring the lousy photos (I tried I, really tried to get better ones but the camera is a 5.0 megapixel 5 years old).Figuring this out has has been difficult with no background in electronics outside of PCs. The camera was meant to show I had twisted the diode pins but only I can tell it seems. That dummyload should be thumbnail picture that can be clicked on.

Without pictures I have the same questions. How do I set up a dummy load? Where do I attach the power supply connectors? Pictures aren't needed to make that concept clear. The dummy load functions as false driver as I understand but my multimeter isn't picking anything up with it connected. I realize this are extremely basic questions but I've never done this type of work before.

As for the driver my question could have simply been do all the pins need to be straight on the diode or can I twist them to fit on the driver? That's what I did because naturally the negative and positive pins were in the wrong position and needed move further. The 3rd pin (used for nothing) ended up coming off.

I will desolder and retry with my other diodes but knowing how to set a dummyload and where the diode should properly be soldered would be huge help.

Sorry about the lousy pictures!

thanks,

Last edited by laser83; 05-07-2009 at 02:27 PM.
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Old 05-07-2009, 02:44 PM #5
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For a dummy load you can buy a 1 Ohm resistor from radio shack for a few cents and attach one end to the positive end of the diode feed and another to the negative end. Get a voltmeter and set it to millivolts and place one end on each side of the resistor. Your reading should be the output current. Hope that helps
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Old 05-07-2009, 04:00 PM #6
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I know the first picture is of a DDL circuit but the test load goes in the same place whatever circuit you use. The picture of the test load has red (+) and black (-) wires, these go to the pads where the ld +- are marked on the circuit board, the power supply goes + to the white lead - to the black lead.

Have a look on your camera to see if there is a setting that brings up a little flower on the viewing screen, this is macro.... you can then get closer to the subject of the photo, half press the shoot button and check that the image is clear on the screen, if so push the button all the way to get the photo taken.

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Setting diode on driver and dummy load-ddl-circuit-test01.jpg   Setting diode on driver and dummy load-test-load01.jpg  
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Old 05-07-2009, 04:48 PM #7
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I use the way rog is showing. It is very easy. umm about where set up power. you attach the dummy load to your driver in the spot where your LD would go. then use the diagram rog posted. hope that helps

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Old 05-07-2009, 05:12 PM #8
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Why do you need the 6 diodes? I know what they do but wouldn't one be able to do it?
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Old 05-07-2009, 05:15 PM #9
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I believe the diodes simulate the current draw of said LD.


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Old 05-07-2009, 05:17 PM #10
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They each drop .7v, multiply that by six = 4.2v which is pretty close to the voltage drop across an 803T LD so you are matching the load that the driver sees.

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Old 05-07-2009, 05:24 PM #11
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Ahh awesome nice to know
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Old 05-07-2009, 06:06 PM #12
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Quote:
Originally Posted by rog8811 View Post
I know the first picture is of a DDL circuit but the test load goes in the same place whatever circuit you use. The picture of the test load has red (+) and black (-) wires, these go to the pads where the ld +- are marked on the circuit board, the power supply goes + to the white lead - to the black lead.

Have a look on your camera to see if there is a setting that brings up a little flower on the viewing screen, this is macro.... you can then get closer to the subject of the photo, half press the shoot button and check that the image is clear on the screen, if so push the button all the way to get the photo taken.

Regards rog8811
Check my first post in this thread again Rog. I found that I could take snapshots with my camcorder and now much better better pics have replaced the old ones. See if that helps, I'm still reading the thread but I'm curious why my diode setting did not work. Now everyone should be able to tell me easily with clear pictures.

Thanks,

Quote:
Originally Posted by chipdouglas View Post
I use the way rog is showing. It is very easy. umm about where set up power. you attach the dummy load to your driver in the spot where your LD would go. then use the diagram rog posted. hope that helps

michael
:slapshead: I knew that's what I was missing! No wonder the test load was not working! That covers that problem. Now just wondering what my error was with the diode.

Yes, my soldering work is terrible. I've barely just started so a little mercy on that part.

Last edited by laser83; 05-07-2009 at 06:12 PM.
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Old 05-07-2009, 06:36 PM #13
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Maybe I am reading wrong but I do not really see a question pertaining to LD problems. BUT.... from my experience the LD pins should be soldered on the same side of the driver board.

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Old 05-07-2009, 06:41 PM #14
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Quote:
from my experience the LD pins should be soldered on the same side of the driver board.
Agreed.....they should be same side
Jees, I am loosing it, just realised first picture is the dummy load......Black wire to LD- white wire to LD+
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Old 05-07-2009, 06:57 PM #15
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I followed the directions given and that's what happened. The positive pin need to be below the LD and the negative above the GD. Yet got nothing when I hooked it up. I connected it straight to the power supply but no power would go out. Right to those plus and - holes on the driver. I believe I had wire set there as well.

is there an example of competed driver with the diode attached tha I can look at? My own lasers have a large amount of expoy so I can't use my own material.
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Old 05-07-2009, 07:04 PM #16
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I should have reviewed this before posting it may not show what we want......but both connections on top

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