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Using jayrob's build but im having a problem

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chaosfourever

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so I don't have to worry about what the test load voltage says as long as I'm getting voltage? Or should it be a certain voltage, and might might 2.43v be becuase I'm using two 3v batteries instead of 3.6v batteries.
 





jayrob

jayrob

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Yes, your voltage reading is a little low because of the batteries. Your current reading will not be correct either if you do not have 2 X 3.6 volt batteries.

You really need to stop thinking about voltage, and measure the current! The current is what is important, along with SUPPLY voltage. You can put up to 37 volts into that driver and your LD will be fine. It will take what ever voltage it needs, as long as the supply voltage is over 7 volts.

So...

* Proper test load
* Proper supply voltage
* Check CURRENT

That's it! Then just make sure you discharge the cap before you connect your LD...
Jay
 
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chaosfourever

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ok that does make sense now. I guess then my real question is how do I measure the current and then what should it be if I do it right. But ya I'll also go get the right batteries.
 
jayrob

jayrob

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chaosfourever said:
ok that does make sense now. I guess then my real question is how do I measure the current and then what should it be if I do it right. But ya I'll also go get the right batteries.
Click to expand...

You've got to be kidding me right? I have answered these questions in some detail. Look at post # 5 for the answer to how to measure current. And look at post #24 for what current to expect with a specific resistor...
Jay
 
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chaosfourever

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ok ya I just remembered now how to do current. I forgot because I never did wiring on the test load yet. First I gotta get the right batteries then I'll run the rest of the tests again.
 
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chaosfourever

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ok update time. So i got the batteries and everything seems to be correct. now i have a stonetek sony 16x diode. which peg is positive and which is negative?
 
thesk8nmidget

thesk8nmidget

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reddiode.jpg
 
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chaosfourever

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ok so i measure directly at the beginning of the connections for my wires and i get 7v so i dont see why my new diode will not light. it doesnt go on at all
 
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chaosfourever

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ok so also when i measure directly at the diode i get like 0.5 or less. y isnt this working now? awwww
 
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chaosfourever

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ok so this is a giant update. i turn the flashlight on and my diode will not light up. so i touch my multimeter to the 2 spots where the wires start to come from the driver. then the diode will light a little bit and i can only get like 1.82v max at times. whats wrong and why is it only lighting a tiny bit when im touching the connections? please help.
 
jayrob

jayrob

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I'd like to help you man... but I think we're at the point where detailed pictures of everything are needed. The diodes are very sensitive, and can easily be damaged even by ESD.

Everybody goes through a 'learning curve' with DIY lasers. And it can be frustrating and disappointing. In the long run, you will get it right, and it will be very rewarding for you!

I tried to show some close up pictures of the driver build in earlier posts. I would like to see your driver and test connections...
Jay
 
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chaosfourever

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I'll try to get you pics. It's hard to find a camera with decent resolution. Thx for the help so far though. I'm excited to get this to finallly work.
 
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chaosfourever

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Ok here is another new new development. i decided to start over again and use this build method
http://www.laserpointerforums.com/forums/YaBB.pl?num=1186966870/0

so i got it all hooked up and it was measuring good voltage. i hooked it all up and when i turn it on the diode lights up. the problem is instead of a nice laser dot i get a large dot. i measue at the diode and i get about 1.8V but again it is connected so this may be skewed because i had plenty of voltage before the hook up. but anyways did i make an expensive LED because the large dot may be consistant but it looks to me like a more powerful LED. plus i did do a lot of trials on this diode so what do u guys think?
 
daguin

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chaosfourever said:
Ok here is another new new development. i decided to start over again and use this build method
http://www.laserpointerforums.com/forums/YaBB.pl?num=1186966870/0

so i got it all hooked up and it was measuring good voltage. i hooked it all up and when i turn it on the diode lights up. the problem is instead of a nice laser dot i get a large dot. i measue at the diode and i get about 1.8V but again it is connected so this may be skewed because i had plenty of voltage before the hook up. but anyways did i make an expensive LED because the large dot may be consistant but it looks to me like a more powerful LED. plus i did do a lot of trials on this diode so what do u guys think?
Click to expand...


Focus the lens.

Peace,
dave
 
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chaosfourever

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i twisted the top of the axis moduale all that i could, even till the focuser lens twisted off and just the diode was there. crap i think i got an expensive LED now.
 
daguin

daguin

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chaosfourever said:
i twisted the top of the axis moduale all that i could, even till the focuser lens twisted off and just the diode was there. crap i think i got an expensive LED now.
Click to expand...


Did you try twisting it "in"? What did the spot do as you twisted the lens?  Did it get bigger?  Did it get smaller?  Did it stay the same?

Start with the lens just in a bit.  Shine the laser at a wall or the ceiling and twist the lens in while looking at the spot.  Even an LED can be focused.  If it IS an LED now, you can still report the findings of this test.  Knowing what the focus looks like will help.

Peace,
dave
 
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