Old 12-16-2008, 10:36 PM #1
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Default 317 Driver help

I am having trouble with the 317 driver as the input voltage is the same as the output voltage and its making my dummy load smoke I am sure its all soldered in the right places but it still wont work! anyone know whats wrong?


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Old 12-16-2008, 10:51 PM #2
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Default Re: 317 Driver help

Need Pictures!!!
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Old 12-16-2008, 10:53 PM #3
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Default Re: 317 Driver help

Quote:
I am having trouble with the 317 driver as the input voltage is the same as the output voltage and its making my dummy load smoke * *I am sure its all soldered in the right places but it still wont work! anyone know whats wrong?
Have you checked the ref voltage? (1.25v) between ref and out? If, as I would guess, *it isn't there I would look for a short circuit or assume a duff regulator.

Put up a clear photo of both sides of the board, it will help diagnosis.

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Old 12-16-2008, 10:54 PM #4
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Default Re: 317 Driver help

Did you follow this thread?

http://www.laserpointerforums.com/fo...num=1185701612
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Old 12-16-2008, 10:58 PM #5
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Default Re: 317 Driver help

....and test it with this?
http://www.laserpointerforums.com/fo...num=1197651171
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Old 12-16-2008, 11:00 PM #6
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Default Re: 317 Driver help

If you powered it without a load, powered it with a shorted load, powered it with reverse polarity, or used too much heat in soldering it, you may have killed the regulator.

Otherwise, if you post a pic we can tell you if you wired it correctly to begin with...
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Old 12-16-2008, 11:04 PM #7
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Default Re: 317 Driver help

I will take some pics soon and the dummy loads a P2 led with a 1ohm resistor
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Old 12-16-2008, 11:08 PM #8
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Default Re: 317 Driver help

Quote:
P2 led with a 1ohm resistor
There's your problem....
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Old 12-16-2008, 11:13 PM #9
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Default Re: 317 Driver help

Heres the dummy load
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Old 12-16-2008, 11:19 PM #10
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Default Re: 317 Driver help

Sorry but i have not learned inpost pics yet :P
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Old 12-16-2008, 11:26 PM #11
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Default Re: 317 Driver help

I can't tell any specifics about the circuit pathways from the front. If possible, give us a picture of the back as well. If the connections on the back can be seen, it will help with diagnosing your problem.
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Old 12-16-2008, 11:27 PM #12
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Default Re: 317 Driver help

Your circuit looks fine, change the test load.....
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Old 12-16-2008, 11:38 PM #13
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Default Re: 317 Driver help

The pic of the back wont load :-/ and what should i use as a dummy load instead and what wrong with the dummy load as it normal works fine?
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Old 12-16-2008, 11:54 PM #14
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Default Re: 317 Driver help

2
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Old 12-17-2008, 12:07 AM #15
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Default Re: 317 Driver help

Quote:
Originally Posted by rog8811
Your circuit looks fine, change the test load.....

I noticed i soldered the pins on the 100ohm pot different so i solder them the same as your diagram and it still did not work.
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Old 12-17-2008, 01:00 AM #16
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Default Re: 317 Driver help



In this photo I've circled an area that seems to possibly have a solder bridge. Check closely and make sure that no solder is touching any adjacent contact strips.
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