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Old 01-18-2011, 01:45 PM #1
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Default built my first lm 317 circuit - what did I do wrong?

Title says it. Built it last night using a single resistor circuit. However, when i turn it on i am getting 8.5 volts LD Out. I attemped to check current using 6 diodes and a 1 ohm resistor in series as load, but not getting anything. Something doesnt seem right. I have included 2 pictures. One of the final board and the other showing exactly how i have the pins soldered to one another. Im a circuit noob so please bear with me.





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Old 01-18-2011, 03:17 PM #2
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Default Re: built my first lm 317 circuit - what did I do wrong?

The first glaring problem I see is that you are bypassing the LM317 completely.

(Also, if that thing to the right of the capacitor is a diode, you're drawing it wrong)
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Old 01-18-2011, 03:23 PM #3
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Default Re: built my first lm 317 circuit - what did I do wrong?

Thanks for pointing that out. Would you be kind enough to show me where i am going wrong? And yes, that is a diode to the right of the cap.
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Old 01-18-2011, 03:30 PM #4
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Default Re: built my first lm 317 circuit - what did I do wrong?

There needs to be a break in the circuit. No current will flow through the LM317 in your design because you offer another path. Current takes the path of least resistance.
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Old 01-18-2011, 03:42 PM #5
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Default Re: built my first lm 317 circuit - what did I do wrong?

here is corrected schematic
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Old 01-18-2011, 03:47 PM #6
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Default Re: built my first lm 317 circuit - what did I do wrong?

^Yes, assuming the left and center pin are "adj" & "out" and the left pin for power is "in."
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Old 01-18-2011, 03:52 PM #7
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Default Re: built my first lm 317 circuit - what did I do wrong?

Ok that makes sense. So the reg. Does not get grounded, it simply stays "positive"? So v in is voltage in and the other two pins are bridged together with a resistor which is also tied to positive?
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Old 01-18-2011, 05:40 PM #8
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Default Re: built my first lm 317 circuit - what did I do wrong?

Yes. I can be used in a grounded fashion, but then it regulates voltage instead of current.
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