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317 Driver help

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ben74

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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 :eek: I am sure its all soldered in the right places but it still wont work! anyone know whats wrong?
 





rog8811

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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?
Click to expand...

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.

Regards rog8811
 
pseudolobster

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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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ben74

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I will take some pics soon and the dummy loads a P2 led with a 1ohm resistor
 
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ben74

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Heres the dummy load
 

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  • Dummy_Load_Instructions.JPG
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ben74

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Sorry but i have not learned inpost pics yet :p
 

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ElektroFreak

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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.
 
rog8811

rog8811

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Your circuit looks fine, change the test load.....
 

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ben74

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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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ben74

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rog8811 said:
Your circuit looks fine, change the test load.....
Click to expand...


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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ElektroFreak

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SolderBridge.jpg


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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