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Old 3rd May 2005, 09:22 PM   #1
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Question computer power supply

What is the possibility of using a 4-500 watt regulated computer (ATX) power supply for some of these 12VDC chip amps? Is it possible? Is the line noise that horrible?
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Old 4th May 2005, 06:42 AM   #2
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if you used some extra capacitors near the chip, it should be good enough for TDA type chips. dont expect too much from them though.
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Old 4th May 2005, 06:47 AM   #3
imix500 is offline imix500  United States
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also remember that you will probably have to load the primary (5v) rail to keep the supply happy.
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Old 4th May 2005, 07:36 AM   #4
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thanks for the feedback, much appreciated!

Now that I know it's possible I'll throw something together and what happens. I'm sure I can keep that 5V happy with a few LEDS.

I've used one previously to run a 100watt car amp bridged to drive a 12" horn sub. Little noisy on startup but worked flawlessly every gig. And that was a PSU with those damn bad Caps that got into everything a few years back.


thanks again!
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Old 5th May 2005, 05:41 AM   #5
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you could power quite a few with this

http://www.pcpowercooling.com/about/whatnew_850_ETX.htm

" Four +12V rails @ 17A ea. (12V1-V4=54A/62A pk.) "

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Old 5th May 2005, 07:42 AM   #6
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one more question! Woud it be possible to simmply connect the +12, +5, -5, -12, and GRND of 2 PSUs together to get 24v?
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Old 5th May 2005, 01:57 PM   #7
Giaime is offline Giaime  Italy
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Quote:
Originally posted by rev_psilocybe
one more question! Woud it be possible to simmply connect the +12, +5, -5, -12, and GRND of 2 PSUs together to get 24v?
Mmmmm... I think you're looking for smoke
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Old 5th May 2005, 03:54 PM   #8
indoubt is offline indoubt  Netherlands
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I've used a PC PSU to power an old carradio. The PSU is modified with a 10.000uF cap, a small bypass cap and a 17Watt resistor on the 5V to keep the supply from shutting down.

It works, it even works reasonable well after adding the capacitance but I don't think it will be as good as a regular supply. It remains a little noisy alhough the fan drops in speed after a minute or so because the supply is operating far from max.

Don't connect the other wires to get 24 Volt, I think they have a common ground ro zero and then you shortcut the thing instantaniously. different PSU might have different topologies though.
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Old 5th May 2005, 04:53 PM   #9
dnsey is offline dnsey  United Kingdom
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I'm currently using a computer PSU to provide + & - 12V supplies for a commercial (Fender) mixer. No dummy load on the PSU, and very little supply filtering in the mixer. Perfectly reliable, and no audible noise through a 200W a side amp.
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Old 6th May 2005, 06:18 AM   #10
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Quote:
Originally posted by dnsey
I'm currently using a computer PSU to provide + & - 12V supplies for a commercial (Fender) mixer. No dummy load on the PSU, and very little supply filtering in the mixer. Perfectly reliable, and no audible noise through a 200W a side amp.

Did you modify your PSU at all? What rating? 250 -500w?

I never had to dummy load the 5v on mine either, just short the remote turn on wire to a ground. I'm getting the feeling this 5v dummy stuff is only for AT power supplys...
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