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Old 12th September 2007, 05:03 AM   #1
diyAudio Member
Join Date: Sep 2007
Default I need computer power supply Schematic using TL494

Hi All
Im want to convert 12V/5V PC power supply to 13.8V /10A output.Som if any any one has complete schematic diagram of PC power supply using TL494 pwm IC,then pls up load that.
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Old 12th September 2007, 08:50 AM   #2
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Join Date: May 2007
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heres one of many.

There are probably many designs out there, for what i've seen i'd say you would be looking at half - bridge with bjt power devices.

If u have a good understanding of how the supply works i'm sure you wont have too many technical difficulties as it doesnt require much re-engineering.

I've had quite an amount of fun taking the transformers apart lol, i've been there. Just dont shatter the core getting it out of the bobbin lol.

Btw these cores are good for home brew supplies too, whenever a pc supply breaks i salvage it.

Have fun, find a good article (eg silicon chip have a feature on this) and dont blow urself up! lol
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Old 12th September 2007, 02:14 PM   #3
m-tech is offline m-tech  Serbia
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You need something like this: http://www.qrp4u.de/docs/en/powersupply/
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Old 13th September 2007, 01:49 AM   #4
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Here's a schematic I modified because I have 3-4 of them units..

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Old 13th September 2007, 02:28 AM   #5
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Here are some threads on AT/ATX Modification of three varieties:

1) +12V input
2) +12V-only output (really, +13.8V)
3) (+/-) Vouts for audio applications.

Can i use a computer power supply to power audio amplifiers?
Computer Power Supply for chip amp?
Using ATX PSU trans for 12V SMPS?
computer power supply
DC/DC converter using parts from PC PSU
ATX (computer) power supplies for power amp
Computer SMPS and Gainclone
PSU from a PC

Hope this helps,

-. ---.. -..- ---
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Old 13th September 2007, 04:12 AM   #6
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Thumbs up Thanking you

Hello Guys,
Thanks for for earlist reply.Im new guy for this form.I checked all the links .Thats very useful to mee.
Thanking you
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