Linear ATX Power Supply

I've never heard of one. Computer power supply is regulated. To reproduce it in linear fashion it would have to operate at minimum line voltage and be able to take max line voltage. Since there is perhaps 20% difference between max and min linear regulators would have to dissipate about 20% of rated power. For 300W supply it would be 60W. Taking other losses into account it would be close to 100W. Removing that much heat, even with a fan in small cage seems impossible especially if you take into account space needed for capacitors and large transformer since transformers operating at high switcher frequency are 10 times smaller.

I assume that your intention is to reduce jitter on digital out. The best solution would be to reclock before DAC or use transfer method that removes timing (Ethernet, Wireless etc) and then reclock only if necessary. Good computer audio board most likely will have own supply that is isolated (floating) but I don't have much experience with audio cards.

Kijanki
Thanks for the response. You are correct that it would be difficult to fit a linear supply into a regular ATX supply case. I should have just asked if anyone knows of a linear ps solution for PC based system. No problem having the ps in an external case.

I like the solution provided by Core Audio Technology, but wondering if there are other companies as well.

My brother just created a PC based server that uses Core Audio's kora power supply. Its a PC made only for music, you can surf the web but nothing else. He used an Atom based processor/MB and a specialty USB card. The PC is tiny and has no fans at all. I must say it sounds really good. He had the mac/mini and kora power supply before but liked the PC based server's sound better.

The kora power supply could power the PC no problem. Its just not a powerful computer for gaming or graphics, but if all your doing is building a music server than it is top notch.

Thanks Runmeshaw.

I also use a PC based server with good results and the linear ps is one of the final tweaks that I would like to make. Problem has been finding a clean solution that wouldn't look out of place in an audio room.

I am concerned about the customer feedback on Core Audio and looking for an alternative, but there doesn't appear to be any. I am surprised there aren't more audiophiles who are looking for this type of product.

Have been trying to convince Gilbert Yeung of Blue Circle to build a custom ps but they are just too busy. I have suggested that there maybe be a demand for this type of product, but it doesn't really appear that way.

Here are some for the Mac Mini

http://www.clonesaudio.com/#!product/prd1/667867321/mpsu

http://www.mojo-audio.com/joule-iii-power-supply/