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Old 02-19-2009, 04:38 PM #1
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Default fried another red

built ddl circuit fried one, got help on second go around, Red Ld lasted thru 1 9v , discharged cap, replaced 9v and result is very little light. Maybe hooked up the lm317 to the digikey 100 ohm pot wrong. Maybe the 3.9 ohm resistor was the wrong choice for the driver. Don't know. Here is a pic of the bottom and top side of the digikey pot #3319P-101-ND. Can someone please tell me the proper way to hook these two items up . . And, should I be using 2- 10ohm 1/4 watt resistors in the driver instead of 1- 3.9 ohm . Thought I had built this properly. Sorry the picture is not that good. Thanks
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Old 02-19-2009, 05:39 PM #2
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Default Re: fried another red

Get a multimeter and measure it. If you don't have a multimeter, that's probably a good reason why you've fried your diode.
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Old 02-19-2009, 05:45 PM #3
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Default Re: fried another red

there really is no wrong way to hook up a pot as long as 2 of the pins are connected. which pins you connect will detemine if it will adjust clockwise or counter clockwise. the pic below is the setup for the pots i use. just make sure your hooking up the adj pin to one of the other pins. doesnt matter which pin b/c it will determine which direction you have to turn to go up or down...

p.s. the badger brings up a good point...how are you testing the current for the driver?
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Old 02-19-2009, 05:59 PM #4
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Default Re: fried another red

Thankyou, also what about the resistor2 10 ohm or one 3.9
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Old 02-19-2009, 06:04 PM #5
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Default Re: fried another red

Here you go...
This is a recently bought SenKat red I assume... (goes off to read thread again :) 3.9 ohms should have been ok, as long as this pot is 100ohms it should be ok as well, measure it to make sure..... although any value would be fine, it would just be more difficult to adjust.

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Old 02-19-2009, 06:15 PM #6
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Default Re: fried another red

I am hooked up the opposite of what this shows. I have the out on the 317 going to the pot with the the two pins that are connected together. Opposite of what you have done rog. Make a difference huh! I did all the testing with the dummy load as you helped me in the past couple weeks. The numbers were good but when I hooked up the Ld, There was not enough light coming out to do any thing. So I turned up more until it burned. Check the #'s and they were very high. Turn it down to qt turn and hardly anything. I will try and remake circuit in a bit using my new breadboard. Anything eals you could think of would be great. As always ROG thank you and you to DREW. I'll let you know how it turns out. Mike
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Old 02-19-2009, 06:18 PM #7
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Default Re: fried another red

Quote:
I am hooked up the opposite of what this shows. I have the out on the 317 going to the pot with the the two pins that are connected together. Opposite of what you have done rog. Make a difference huh
Makes no difference at all....

Quote:
remake circuit in a bit using my new breadboard
Try soldering it together, I rarely use my breadboard for power supplies as contacts can be disturbed so easily..

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Old 02-19-2009, 06:19 PM #8
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Default Re: fried another red

By the way Rog, Nice new site you have, i'll join later tonight .
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Old 02-19-2009, 06:25 PM #9
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Default Re: fried another red

Thanks, I am not exactly over run with members
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Old 02-19-2009, 06:39 PM #10
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Default Re: fried another red

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Old 02-19-2009, 06:44 PM #11
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Default Re: fried another red

Thank you dave, do you think anyone will notice?

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