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Old 02-18-2010, 08:43 PM #1
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Default Can anyone see what I've done wrong?

I swear this whole whitefusion build is cursed. I've blown almost $200 worth of diodes while making this, now I've rebuilt this driver twice and each time it's putting out 2+ amps. I've built dozens of drivers before, and I've never had a problem anything like this before.

Can anyone spot what I'm doing wrong here? I'm measuring 50ohms between the out and adj pins of the regulator, so in theory I should be getting a just a couple mA, but instead it's putting out enough amperage to make my test load too hot to touch.



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Old 02-18-2010, 08:56 PM #2
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Default Re: Can anyone see what I've done wrong?

Can't see anything wrong - I presume there are 2 other pots wired the same way hidden by the heatsinks? Try cutting +v to the other regulators, and see if each regulator works fine independently of the others.
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Old 02-18-2010, 09:05 PM #3
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Default Re: Can anyone see what I've done wrong?

When this loses regulation, is it connected to the diodes? Did you remember (and test) that the green is reverse polarity?

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Old 02-18-2010, 09:10 PM #4
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Default Re: Can anyone see what I've done wrong?

I would highly recommend not measuring resistance with the pot already in circuit. Unless you have a special low voltage ohms measurement on your meter, current through the chip itself is severely skewing your reading.

If you have a test load and a DMM, then just adjust the pot until the current is correct, ignore the resistance when it's already in circuit.
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Old 02-18-2010, 09:12 PM #5
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Default Re: Can anyone see what I've done wrong?

Hard to tell by the photos... do you have a schematic/drawing of
exactly what you put together (not a generic DDL drawing... but
your exact circuit in the pictures)

Like CB posted... disconnect the other regulators and take it down to
one basic circuit. Check for small solder jumpers or frayed wire shorts..
Some times a small short is found under overheated flux... scrape
between pads to be sure.. Are the Heatsinks common electrically ??

Jerry
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Old 02-18-2010, 09:13 PM #6
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Default Re: Can anyone see what I've done wrong?

Quote:
Originally Posted by charliebruce View Post
Can't see anything wrong - I presume there are 2 other pots wired the same way hidden by the heatsinks? Try cutting +v to the other regulators, and see if each regulator works fine independently of the others.
I'll give that a shot, but I can't imagine how that would make a difference, the drivers are isolated from eachother, they just share a common 12v rail.



Quote:
Originally Posted by Hemlock_Mike View Post
When this loses regulation, is it connected to the diodes? Did you remember (and test) that the green is reverse polarity?
HMike
Using a test load, no diodes here. Yes, I've checked that my test load works, isn't shorted out or anything, etc... I'm not sure what the amperage is, but it's awfully high. My DMM is set to the 2v range, and it maxes out, so it's obviously more than 2A... Within a second the diodes on the test load are too hot to touch.
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Old 02-18-2010, 09:18 PM #7
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Default Re: Can anyone see what I've done wrong?

Quote:
Originally Posted by aXit View Post
I would highly recommend not measuring resistance with the pot already in circuit.
I haven't touched the pots really, they're set to the default resistance they came with from the factory, which is around 50ohms. I was just pointing that out to clarify that I wasn't setting the pot to its lowest setting or something.

Quote:
Originally Posted by lasersbee View Post
Hard to tell by the photos... do you have a schematic/drawing of
exactly what you put together (not a generic DDL drawing... but
your exact circuit in the pictures)
In the second picture I've drawn some lines to clarify what's going on. I could make a drawing, but it'd basically just come out as a standard DDL circuit.
The heatsinks are isolated.
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Old 02-18-2010, 09:19 PM #8
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Default Re: Can anyone see what I've done wrong?

Quote:
Originally Posted by lasersbee View Post
Are the Heatsinks common electrically ??
^^This is a possible option which would be solved/noticeable by cutting power to the other regulators. If you're powering up the other 2 regulators without a load, they essentially just up the voltage to the highest output possible, which is Vin - 2.25v I think.

EDIT: already answered, ignore this.
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Old 02-18-2010, 09:20 PM #9
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Default Re: Can anyone see what I've done wrong?

Jerry ---
Would a parasitic oscillation be possible with these stacked like this? No common ground. I've seen 7805's go nuts without proper bypassing. Have you experienced this?

A wild ass guess here--------

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Old 02-18-2010, 09:44 PM #10
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Default Re: Can anyone see what I've done wrong?

If the outputs are really isolated and all 3 adjustment pins are isolated
and the only common pin is the input line I can't see any cause for oscillation problems Mike...
Perhaps the Regulator it's self had been damaged... and is outputting
full current/voltage...
Would need to be checked with a DMM as well as the Reference Voltage...

Like CB stated... disconnect all 3 regulator circuits and go at them one by
one... don't take anything for granted...

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Old 02-18-2010, 10:02 PM #11
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Default Re: Can anyone see what I've done wrong?

Tried one by itself, no change. Bah.

The amperage is the same as the input, the voltage is dropped by 1.5v or so.. I can only assume the regulators are dead. I'll try swapping them **AGAIN** later this evening... I dunno, maybe I put reverse current to them at some point or maybe I ESD'd into them.

*Sigh*...
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Old 02-18-2010, 10:05 PM #12
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Default Re: Can anyone see what I've done wrong?

Your circuit is incorrect. Refer to this rather simplistic diagram for the operation of the LM317 regulator:

Your V-Out needs to be continuous with the ADJ pin of the LM317. With your setup it is continuous with the OUT pin.
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Old 02-18-2010, 10:28 PM #13
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Default Re: Can anyone see what I've done wrong?

Quote:
Originally Posted by Jimmymcjimthejim View Post
Your circuit is incorrect. Refer to this rather simplistic diagram for the operation of the LM317 regulator:

Your V-Out needs to be continuous with the ADJ pin of the LM317. With your setup it is continuous with the OUT pin.
This!! Move output to the other side of the resistor and it should be solved.

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Old 02-18-2010, 11:08 PM #14
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Default Re: Can anyone see what I've done wrong?

Quote:
Originally Posted by Jimmymcjimthejim View Post
Your circuit is incorrect. Refer to this rather simplistic diagram for the operation of the LM317 regulator:

Your V-Out needs to be continuous with the ADJ pin of the LM317. With your setup it is continuous with the OUT pin.
THANK YOU!!

I knew it was something stupidly simple like that... I just needed another set of eyes to figure it out.
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Old 02-18-2010, 11:29 PM #15
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Default Re: Can anyone see what I've done wrong?

No problem
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Old 02-18-2010, 11:45 PM #16
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Join Date: Jan 2007
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Default Re: Can anyone see what I've done wrong?

Way to go Jimmy ----
I had my glasses off and my nose to the screen but I didn't see that. I think I see what you say ....

HMike
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