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Old 12-04-2014, 07:30 PM #1
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Default Weird LM317 question

I have a really weird thing happening with my Lm317 driver. I built it for my A140 445 diode. When I connect my DMM in Amp mode to the output side I get 0.99 amps which is what I was aiming for in terms of current. But when I connect the DMM in series with the diode, I am reading only 500 mA. Why is this? So how much current is my diode really getting? I should mention I am using a 9 volt battery as the input source. Thanks.


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Old 12-04-2014, 08:06 PM #2
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Default Re: Weird LM317 question

9V batteries aren't very good at supplying much current. What's happening is that your battery can only provide ~ 7.5 volts @ 500mA. Under those conditions the 317 is operating wide open but there isn't enough voltage to cram an amp through the diode. Use a different power source. I built a 405 using 3 CR123s in series for my 9V source. These batteries won't last long if you're pulling an amp from them but it'll be vastly better than the 9V battery.
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Old 12-04-2014, 08:08 PM #3
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Default Re: Weird LM317 question

Yes thank you! That was it I connected a 12 volt PSU supply and now my diode is getting what it needs lol.
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Old 12-05-2014, 11:50 PM #4
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Default Re: Weird LM317 question

DO NOT connect the DMM in series with the diode after the driver's capacitor (if you have one)!

Diode's connection must be permanent, because a split second of non-secure contact, and capacitor charges up with full driver's output (which changed in voltage due to change in load's resistance), and when reconnected, destroys your diode!

Always use a test load to measure the driver's output.

And yeah those small 9V bricks absolutely suck. I'm amazed you were able to get 500mA out of it.
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Old 12-05-2014, 11:58 PM #5
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Default Re: Weird LM317 question

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Originally Posted by Eudaimonium View Post
DO NOT connect the DMM in series with the diode after the driver's capacitor (if you have one)!

Diode's connection must be permanent, because a split second of non-secure contact, and capacitor charges up with full driver's output (which changed in voltage due to change in load's resistance), and when reconnected, destroys your diode!

Always use a test load to measure the driver's output.

And yeah those small 9V bricks absolutely suck. I'm amazed you were able to get 500mA out of it.
Great advice, many diodes have died this way
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Old 12-05-2014, 11:59 PM #6
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Default Re: Weird LM317 question

Well I appreciate that advice. However I have always connected it this way. Maybe I am just lucky or dumb. But nonetheless you are right. Now I think about it no load would charge the cap up beyond what we want for the diodes. +REP to you good sir!
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Old 12-06-2014, 08:47 AM #7
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Default Re: Weird LM317 question

Quote:
Originally Posted by Devilz Rej3ct View Post
Well I appreciate that advice. However I have always connected it this way. Maybe I am just lucky or dumb. But nonetheless you are right. Now I think about it no load would charge the cap up beyond what we want for the diodes. +REP to you good sir!
Possibly lucky beyond compare

Like Ehgemus said, many diodes died this way.

That would include mine.
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Old 12-06-2014, 09:05 AM #8
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Default Re: Weird LM317 question

As its a Linear regulator , just measure the current on the input side as Input current = output current .
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Old 12-06-2014, 09:15 AM #9
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Default Re: Weird LM317 question

Quote:
Originally Posted by ionlaser555 View Post
As its a Linear regulator , just measure the current on the input side as Input current = output current .
That is also true, and good advice. Using DMM in Amp meter mode to connect the driver to a battery is a good way to measure current with accurate results.
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Old 12-06-2014, 04:02 PM #10
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Default Re: Weird LM317 question

The input side of the LM317? Series or parallel?
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Old 12-06-2014, 04:23 PM #11
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Default Re: Weird LM317 question

Quote:
Originally Posted by Devilz Rej3ct View Post
The input side of the LM317? Series or parallel?
DMM in current mode in series with the positive line on the input side to the LM317 CC circuit .

All you are doing is placing a low value resistor ( current shunt inside DMM ) in series with the regulator input and as current is the same thought out the whole LM317 CC circuit it will show diode current , while keeping the diode safe

Quote:
Originally Posted by Eudaimonium View Post
That is also true, and good advice. Using DMM in Amp meter mode to connect the driver to a battery is a good way to measure current with accurate results.
Thanks , Ive done it a few times when using LiPo's
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Old 12-06-2014, 05:12 PM #12
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Default Re: Weird LM317 question

Okay so in between the LM317 input pin and the battery or power source?
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Old 12-06-2014, 05:17 PM #13
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Default Re: Weird LM317 question

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Originally Posted by Devilz Rej3ct View Post
Okay so in between the LM317 input pin and the battery or power source?
Yup .
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Old 12-06-2014, 06:54 PM #14
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Default Re: Weird LM317 question

Awesome thank you!
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