Power Supply for Gigabit Ethernet G4 tower

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Joined: Dec 28 2004
Posts: 3

I am looking for a power supply for my G4 GigE Tower. This is the 338W 22-pin type (Apple part# is 661-2332 or 614-0112). The companies that I've found on the web that have them are selling them for a pretty steep price (close to $200) but I'm hoping someone here has one that they're willing to sell for much less.

Thanks!!

Jack Mac OS

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martakz's picture
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Joined: Dec 20 2003
Posts: 634
Can't an ATX be modded for th

Can't an ATX be modded for these models?

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Joined: Dec 28 2004
Posts: 3
Not that I know of...

Thanks for the suggestion, but I don't think a standard ATX power supply would work.
From xlr8yourmac.com, a standard PC ATX Power Supply doesn't have 28V DC and is not pin compatible (standard 20-pin vs. 22-pin) with the Gigabit G4 (mine)and later G4 systems. The GigE power supply/motherboard passes 28 Volts DC from the power supply to a connector for the ADC port graphics card.
And even if it could be modded, I wouldn't have a clue as to how to do it.

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Joined: Dec 20 2003
Posts: 354
Here's some help: [url]htt

Here's some help:

http://homepage.mac.com/baakre/.cv/baakre/Public/28v_vreg.pdf-link.pdf

Don't know if you'll be able to still use the ADC port though.

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martakz's picture
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Joined: Dec 20 2003
Posts: 634
It would be quite easy to mak

It would be quite easy to make the powersupply output 28V...

Best method: 12V DV to 28V regulated dc convertor board. I once saw one of these in maplin as was very tempted to buy one. They need to be heatsinked, so epoxy the thing to the inside of the ATX's case... They also have auto thermal cut out.

Hard method:

Take the 12V dc line and use an oscillator to create an AC waveform. Feed this through a transformer and boost to around 34V. Then use a the voltage regulators to take that down to 28V and add filter capactiors... Alot of work, but there is plenty of space in the ATX PSU case for modification.

EDIT: Sorry Dead Elvis, I did not see your post! Anyway, the method described on your link is far better than my linear transformer. It looks like it uses a buck boost, switch mode?

Anyway, that will be alot more efficient than a linear boost...so go for that!

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Now using x86 machines. Bye bye iMac266 (Strawberry), G3 1400 and the G3 IIsi.

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Joined: Dec 28 2004
Posts: 3
Thanks for the suggestions

I really appreciate everyone's feedback, but I really am not looking to mod an ATX power supply. I just want a replacement, and am really not comfortable messing around with mods like this. If anyone has an Apple power supply that works specficially for the G4 Gigabit models for a reasonable amount please let me know.

Thanks again for the suggestions, though.

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Joined: Feb 4 2006
Posts: 1
web site for you

Try this one I am on a mission to replace my power supply and this seems to be the best deal.http://mac.techrestore.com/

good luck