3dfx Archive - AAlchemy 8164

gdonovan YaBB Administrator Offline Infernal Collector Posts: 2361	Re: AAlchemy 8164 Reply #45 - 28.08.08 at 12:08:37 m14radu wrote on 27.08.08 at 12:55:18: @ Gary: would it be possible to makes some Fotos of the AA5 PSU interior ? Sure.
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MaxPain YaBB Newbies Offline AAAAARG! Posts: 14	Re: AAlchemy 8164 Reply #46 - 28.08.08 at 13:32:41 m14radu wrote on 28.08.08 at 10:54:52: What value should must have the Resistor / Potentiometer ? I don't quite understand what you mean
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m14radu

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Re: AAlchemy 8164
Reply #47 - 28.08.08 at 14:33:00

Your words:
"I think maybe the resistor might not be allowing enough amps through it, but I'm not an electrician, so I can't exactly answer that with certainty. My problem when I was trying to find a regulator, was that they could only handle a certain amount of amps. What size resistor are you using to step-down the voltage to 2.9? "

I mean the value / size of this resistor ! Wink

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« Last Edit: 28.08.08 at 14:33:44 by m14radu »

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MaxPain

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Re: AAlchemy 8164
Reply #48 - 28.08.08 at 16:49:51

m14radu wrote on 28.08.08 at 14:33:00:

Your words:
"I think maybe the resistor might not be allowing enough amps through it, but I'm not an electrician, so I can't exactly answer that with certainty. My problem when I was trying to find a regulator, was that they could only handle a certain amount of amps. What size resistor are you using to step-down the voltage to 2.9? "

I mean the value / size of this resistor ! Wink

I don't know Embarrassed

Otherwise I'd have mine up and running Tongue

EDIT: I guess I can try and help what you mean. If there's any way for you to put a load on your PSU and KNOW that the load is like 10amps (since that's all your meter can read you said) through your resistor/pot at 2.9v, and you measure it and it's still 2.9v and 10amps, then I think you should probably be able to push the other 30amps through it. But, this is all a guess again, since this I don't know electrical stuff at all.

EDIT2: haha Too bad this thing doesn't output more amps! I like "precision!" http://cgi.ebay.com/HP-6115A-Precision-DCPower-Supply-0-50V-8A-50-100V-4A_W0QQit...

Page 6, the first one is perfect, but needs too high of input voltage :\
http://www.kikusui.co.jp/common/product/pdf/pad-la.pdf

EDIT3: OK Here's basically what I'm talking about with small regulators. Notice the "Maximum Current", it's at the best, 2amps.
http://www.eleinmec.com/article.asp?20

Go here, then goto page 53. That's essentially what you're using, and their max current is 3a. A far cry from the 30-45 we need :S

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« Last Edit: 28.08.08 at 20:50:09 by MaxPain »

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Re: AAlchemy 8164
Reply #49 - 28.08.08 at 21:47:10

Solution to our problems:

SO We're going to have to get 2 PSU's with high 12v rail amperage and run them in parallel (yes, 2 PSUs, just like how Q3D did it!) and then run one of these to knock 12v down to 2.9v, a 9.1v Zener Diode.
http://octopart.com/info/Fairchild/1N5239B

The Zener Diode is what are used in IC components to step-down voltages. I wasn't able to find any 2.1v ones to utilize the 5v line though.

Then we'll be able to parallel the 3.3v as well and for sure have enough amps there too.

Now, for me, not so hard, I found a PSU with dual 12v rails totaling 33A, making for 66A for $17/ea. Should easily be enough for 1 81xx card. But for you m14, I'm not sure. They have cheap PSU's around you like that?

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« Last Edit: 29.08.08 at 03:31:21 by MaxPain »

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m14radu God Member Offline Take your chance ! Posts: 555 Timisoara, Romania Gender:	Re: AAlchemy 8164 Reply #50 - 29.08.08 at 08:32:16 No, there are no PSU like that here. But i will keep searching. By using the 12V line you have 10 AMP less than on the 5V Line, but i think it shold be enough ! Please post some pictures if u made some progress
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Re: AAlchemy 8164
Reply #51 - 29.08.08 at 18:12:11

m14radu wrote on 29.08.08 at 08:32:16:

No, there are no PSU like that here.
But i will keep searching.

By using the 12V line you have 10 AMP less than on the 5V Line, but i think it shold be enough !
Please post some pictures if u made some progress Wink

No, I'll have much more than the 5v line. 2 PSU's = 66A where as the 1 PSU I was going to use only had 35A or so.

I won't be able to buy the stuff quite yet, but I'll for sure keep you posted when I do.

And even if you have another crap PSU that isn't all that powerful, but can equal enough on the 12v for amps, you'll be set as well. The ones with multiple 12v rails are the ones that end up putting out much more amps than others.

EDIT: BTW I figured I'd mention you should test out the ability of the diode setup by powering something that you know draws at like at least 5amps and see how it fairs.

Or if you have the money ($450), this is 150% what we need.
http://www.irf.com/technical-info/refdesigns/irdcip2003a-c.pdf

If you look at the design below, it runs in series, and to run 80A, from my understanding, you'd only need 2 chips, not all 4. Not only does it allow for the voltage we need, but it allows for the current throughput as well!

If that diode test fails, then I give up. Short of spending $450+ or making my own PSU (or the fat chance another comes on eBay and I have money at that time), I'm shit out of luck. Maybe I'll plug in that worthless Sensor Post Processor and see what it does on it's own.

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« Last Edit: 30.08.08 at 07:30:51 by MaxPain »

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Re: AAlchemy 8164
Reply #52 - 30.08.08 at 15:37:10

Been doing some reading, and apparently I was misinformed by my friend. 9.1v doesn't equal the drop the diode creates, but is what the diode allows through. So if it says it's a 9.1v diode, and we hook it up to a 12v power source only 2.9v is dropped. Not what we were going for. So we want to find a 2.9v diode, so that 9.1v is dropped from the 12v line.

Making it possibly easier to use a 5v rail still, since again, if we find a 2.9v diode, then we're putting out 2.9v. Should also keep the diode temperature way down.

Here's what I've been reading for some help:
http://www.allaboutcircuits.com/vol_3/chpt_3/11.html

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m14radu God Member Offline Take your chance ! Posts: 555 Timisoara, Romania Gender:	Re: AAlchemy 8164 Reply #53 - 31.10.08 at 07:58:05 did u manage to start the board ? any good news ?
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Re: AAlchemy 8164
Reply #54 - 25.11.08 at 00:54:39

m14radu wrote on 31.10.08 at 07:58:05:

did u manage to start the board ?
any good news ?
Wink

Naw, not yet. No money to get the supplies. I could fib and get a test sample, but I'd have to create something elaborate to fill in these requirements:

Hi Clint,
We are the Emerson manufacture rep and I can work with the factory in regards to the sample.

Can you provide the following information, this is needed for the sample?

Company Name
Project/Application
EAU
Production Date

I did see that Mouser (authorized Emerson Distributor) currently has 102 pcs of stock for immediate delivery. They can be reached at 1-800-346-6873

Thank You,

Kristine Melser
Mel Foster Company
Phone: 952-946-5140
Fax: 952-944-0634
Email: kristine@melfoster.com

It's in regards to this item:
http://www.mouser.com/Search/ProductDetail.aspx?qs=RMiEzKrVl1fxKnLTck7QFg%3D%3D

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Tritop Full Member Offline «» 3dfx Collector «» Posts: 175	Re: AAlchemy 8164 Reply #55 - 30.11.08 at 17:04:00 My father in law works for emerson as an engineer. I already asked him about a power supply for the AAlchemy, he told me that this can be very expensive because it would be custom and in a limited quantity
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Re: AAlchemy 8164
Reply #56 - 30.11.08 at 23:13:53

Tritop wrote on 30.11.08 at 17:04:00:

My father in law works for emerson as an engineer. I already asked him about a power supply for the AAlchemy, he told me that this can be very expensive because it would be custom and in a limited quantity

Well yea, if we went directly though Emerson for it. If HE could get a few custom one's, well he could sell them for a cheap price then. If Gary could give him lots of detailed pics of the second PSU (not the main one for the rest of the computer) inside the case, I don't see why a 'clone' couldn't be made. All we need is a PSU that supports to right kind of active management (or whatever it is) and puts out 2.9v @ 35-75amps (for 1-2 card configs). What I've found will let me at least do the 2.9v @ 35amps, the only thing I can't say for sure on, is if it's active power management thinger is correct. I don't see it not working though, considering that m14radu got his to boot into windows simply using a potentiometer!

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m14radu God Member Offline Take your chance ! Posts: 555 Timisoara, Romania Gender:	Re: AAlchemy 8164 Reply #57 - 26.12.08 at 19:07:50 I made this days some researches and tests - the ideea is to start the board by using two PSU. Here are some details.... http://www.voodoo3dfx.com/Foro_V6k/viewtopic.php?t=118&start=15 Every feedback / advice is wellcome. Regards. Radu.
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