Old 07-14-2016, 02:50 PM #1
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Default Test if diode is working?

Hey there I'm not sure if this is the right place to ask but I had a question on a diode I just got. I am making a violet laser using a bdr-209 diode and I kinda dropped in when I took it out of the packaging. It fell maybe four feet and hit the ground. I hoped it wasn't damaged but when I hooked it up to the driver and power supply it wouldn't turn on. I looked inside the can as best as I could and it didn't seem as if anything was broken, but I couldn't see it that well even with a magnifying lens. I remember my grandfather telling me something about using my meter to check ohms of resistance on the diode but I can't remember to well.

Any help you could give me is greatly appreciated


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Old 07-14-2016, 04:10 PM #2
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Default Re: Test if diode is working?

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Originally Posted by Lildutchboy7 View Post
Hey there I'm not sure if this is the right place to ask but I had a question on a diode I just got. I am making a violet laser using a bdr-209 diode and I kinda dropped in when I took it out of the packaging. It fell maybe four feet and hit the ground. I hoped it wasn't damaged but when I hooked it up to the driver and power supply it wouldn't turn on. I looked inside the can as best as I could and it didn't seem as if anything was broken, but I couldn't see it that well even with a magnifying lens. I remember my grandfather telling me something about using my meter to check ohms of resistance on the diode but I can't remember to well.

Any help you could give me is greatly appreciated
Do you have a dummy load to test driver output current? If driver is output correct current, and voltage is correct on input side (batteries are good) then it would probably be toast =(

How to make a selectable Dummy Load - VERY in depth
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Old 07-14-2016, 04:23 PM #3
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Default Re: Test if diode is working?

Quote:
Originally Posted by 94Z28 View Post
Do you have a dummy load to test driver output current? If driver is output correct current, and voltage is correct on input side (batteries are good) then it would probably be toast =(

How to make a selectable Dummy Load - VERY in depth

Either that or you have the diode connected to the driver incorrectly.
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Old 07-14-2016, 05:42 PM #4
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Default Re: Test if diode is working?

Quote:
Originally Posted by 94Z28 View Post
Do you have a dummy load to test driver output current? If driver is output correct current, and voltage is correct on input side (batteries are good) then it would probably be toast =(

How to make a selectable Dummy Load - VERY in depth
I don't have a test load but I got the driver from DTR so I assume it would be pretty good. I'll look into getting a test load though, because I'll probably need one for future experiments anyways


Quote:
Originally Posted by diachi View Post
Either that or you have the diode connected to the driver incorrectly.
I checked the pin-out and it should be good. Blah.
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Old 07-14-2016, 05:52 PM #5
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Default Re: Test if diode is working?

Quote:
Originally Posted by Lildutchboy7 View Post
I don't have a test load but I got the driver from DTR so I assume it would be pretty good. I'll look into getting a test load though, because I'll probably need one for future experiments anyways




I checked the pin-out and it should be good. Blah.

You can build a dummy load rather easy - bunch of silicon rectifier diodes (0.7V drop/diode, pick however many you need to get close to your LDs voltage drop) and a 1Ω resistor. Need to pick diodes/resistors with the correct ratings for the maximum current you plan on testing of course. You wouldn't test a driver set to 5A using a bunch of 1N4001s...
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Old 07-14-2016, 06:14 PM #6
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Default Re: Test if diode is working?

Quote:
Originally Posted by diachi View Post
You can build a dummy load rather easy - bunch of silicon rectifier diodes (0.7V drop/diode, pick however many you need to get close to your LDs voltage drop) and a 1Ω resistor. Need to pick diodes/resistors with the correct ratings for the maximum current you plan on testing of course. You wouldn't test a driver set to 5A using a bunch of 1N4001s...
Yeah I'll probably have to go get some parts then
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Old 07-14-2016, 09:16 PM #7
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Default Re: Test if diode is working?

Soooooo I didn't even do anything to it but I decided to give it one last go and I hooked it back up to the power supply... Aaaaaand it worked

Whatever happened I'm happy anyways. Thanks for your advice anyways guys
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Old 07-14-2016, 09:37 PM #8
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Default Re: Test if diode is working?

Quote:
Originally Posted by Lildutchboy7 View Post
Soooooo I didn't even do anything to it but I decided to give it one last go and I hooked it back up to the power supply... Aaaaaand it worked

Whatever happened I'm happy anyways. Thanks for your advice anyways guys

Loose connection somewhere maybe? Either way - glad to hear you got it working!
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Old 07-14-2016, 10:16 PM #9
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Default Re: Test if diode is working?

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Loose connection somewhere maybe? Either way - glad to hear you got it working!
Maybe but I don't know. I had it soldered together and the ends that were connected to the driver were hooked up to alligator clips. Oh well whatever it was it went away.
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Old 07-15-2016, 01:29 AM #10
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Default Re: Test if diode is working?

hi,
If your going to build you need equipment LPM, PSU , DMM, test load ....... takes the W out of work you can never have enough equipment for this hobby..It pays off buddy

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Old 07-15-2016, 05:26 AM #11
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Default Re: Test if diode is working?

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hi,
If your going to build you need equipment LPM, PSU , DMM, test load ....... takes the W out of work you can never have enough equipment for this hobby..It pays off buddy

Rich
Yeah. I'd really like to have a lot of this stuff but I'm still kind of young, so my cash income isn't very substantial, yet. I'm moving down to Southern Virginia soon to start schooling/work, so I should be making enough money then to save up and afford some things. I'm gonna aim for an LPM and test load first. Then I'll work on the other stuff.

I have some big plans for my laser collection
Just gotta save up first
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