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#1 |
diyAudio Member
Join Date: May 2005
Location: Houston,TX
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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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#2 |
diyAudio Member
Join Date: Dec 2003
Location: Toronto Canada
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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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#3 |
diyAudio Member
Join Date: Mar 2004
Location: Nashville, TN
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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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#4 |
diyAudio Member
Join Date: May 2005
Location: Houston,TX
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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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#5 |
diyAudio Member
Join Date: Dec 2003
Location: Toronto Canada
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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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#6 |
diyAudio Member
Join Date: May 2005
Location: Houston,TX
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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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#7 | |
diyAudio Member
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Quote:
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#8 |
diyAudio Member
Join Date: Aug 2003
Location: Sweet lake city
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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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better be indoubt untill you're sure |
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#9 |
diyAudio Member
Join Date: Mar 2004
Location: Shropshire, England
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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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#10 | |
diyAudio Member
Join Date: May 2005
Location: Houston,TX
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Quote:
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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Thread | Thread Starter | Forum | Replies | Last Post |
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