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Old 11th July 2006, 09:15 AM   #1
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Default PC SMPS querries

I purchased this SMPS>>http://www.intextechnologies.com/dpr...erals&sub=SMPS
400w rating.The specs on the website show 10A for 12V but on the sticker on the SMPS its written 12V at 20A.Whatever...
Its more than enough for a single supply chipamp.

Do I need to keep the +5V busy too(with some load) so that the SMPS runs fine.
Since the curent capability is high,i dont think there is a need to modify the internals for more current.I plan to hook it up directly to the amp to provide +12V dc....for that is it essential to load the +5V too?do i need to load rest all the outputs too?if yes...how to do it?

Moreover,its an ATX PSU with something as PWR ON pin, so if i use it outside the pc,which two or three etc etc wires need to be connected(shorted) in the 20pin connector so that the SMPS can operate outside the cabinet(does the green one mates with black one?)

Sagar
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Old 11th July 2006, 11:52 AM   #2
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Yes, green is a power on. Short it to ground (black).
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Old 11th July 2006, 01:12 PM   #3
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Sagar,

You should load down the +5V line for about an amp or two to get the full 12V out. An even better approach to this would be to modify the supply by rewinding the transformer's secondaries to give out a true +13.8V, and eliminating the +5V line all together.

Not too difficult to do, of you have some experience, and there are several threads here in the Forum on that subject. Just my $0.02 worth.

Steve
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Old 11th July 2006, 02:44 PM   #4
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Each reply is worth a million(to say the least).
I sifted thru all the threads on this forum to mint out the required info but to no avail.
For loading +5V, couple of LEDs lying waste in my component box seem to me as suitable candidates OR is there a better approach?
SMPS gives +13.7V dc at no load[switched on by shorting pins 11 and 12]
Can suitable modifications be carried out easily to enable the SMPS to supply bipolar outputs for dual supply amplifiers?

Sagar
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Old 11th July 2006, 02:47 PM   #5
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Hope this helps....
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File Type: gif atx adaptor for chipamp.gif (6.8 KB, 396 views)
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Old 11th July 2006, 02:50 PM   #6
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but thats only + -12V.
the amp will only purr at such low volts.
The resistance needs a heatsink?

Sagar
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Old 11th July 2006, 03:10 PM   #7
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Try this..
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File Type: gif atx adaptor for chipamp.gif (5.2 KB, 327 views)
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Old 11th July 2006, 03:10 PM   #8
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Can you please tell the component values and how come voltage gets to +- 25V?
What is this T1 etc etc,are they in the SMPS or these are the modifications to be done?
Torroids are to be rewound?

If u have tried this out, can u post the pics too?
Sagar
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Old 11th July 2006, 03:11 PM   #9
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Ur right thats part of SMPS ferrite trf.
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Old 11th July 2006, 03:13 PM   #10
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Sagar-

+/-12V is already available from the SMPS, however the -12V is only about an amp, or so. To get the full -12V current,

you will need to swap out the two small 1amp diodes on the -12V line for a couple of heavier-duty ultrafast or schottky diodes, rated at, say 8A, 200V. Or, you could go with a common-anode double diode, like those found in most car amps. This would enable you to use the full -12V and get you the +/- bipolar supply you need.

BTW, the last schematic shown will only generate +/-12V, not +/-24-25V, because it's center-tap reference is still halfway across the secondary.

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