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My "RDX" build. Sometimes it takes very little to set off an extensive mod. - Page 4

post #31 of 52
Quote:
Originally Posted by RonindeBeatrice View Post
Heh, yeah I get carried away pondering how to fit more in less.

I suppose you could piggy back a couple of bricks together. The original XBox 360 PSU put out >200W of 12V DC (just sayin').
The xbox brick is also the size of a loaf of bread.

I like his design. Stepping up the voltage to get better characteristics on the SMPS is pretty cool.
post #32 of 52
Thread Starter 
Quote:
Originally Posted by Dyson Poindexter View Post
Stepping up the voltage to get better characteristics on the SMPS is pretty cool.
NOT MY IDEA, The circuit is almost directly from their data sheets!
I just added a microcontroller.

The neat thing is if I had tons of space to play with I could double up on those capacitors and build in a brown out circuit to warn the computer that power will fail. As it stands it'll pretty much go down instantly but when I am testing with just LEDs and fans and stuff it stays running for a half second or so.
post #33 of 52
Quote:
Originally Posted by Dyson Poindexter View Post
The xbox brick is also the size of a loaf of bread.

I like his design. Stepping up the voltage to get better characteristics on the SMPS is pretty cool.
Don't get me wrong, I love his ingenuity, but he also expressed the interest of building more of these for a select few, and there aren't may people that would be willing to pay $1000 for just the case+psu.
    
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post #34 of 52
Quote:
Originally Posted by RonindeBeatrice View Post
Don't get me wrong, I love his ingenuity, but he also expressed the interest of building more of these for a select few, and there aren't may people that would be willing to pay $1000 for just the case+psu.
If you're willing to put up with his style of PSU, that is one that is missing a few of the regulatory approvals and safety features (not knocking the OP) This type of circuit can be pulled off without much fuss once economies of scale kick in.

I get what you're saying, and hiding a brick somewhere is another viable choice. I've always thought about stepping up the AC and rectifying it outside of the case, and just have a HV DC-DC converter inside the box. That'd save heat and prolly help EMC as well. Just have to be careful to keep it from ringing.
post #35 of 52
Quote:
Originally Posted by oh_bother View Post
NOT MY IDEA, The circuit is almost directly from their data sheets!
I just added a microcontroller.

The neat thing is if I had tons of space to play with I could double up on those capacitors and build in a brown out circuit to warn the computer that power will fail. As it stands it'll pretty much go down instantly but when I am testing with just LEDs and fans and stuff it stays running for a half second or so.
Have you taken a scope to your pcie power yet? I'd be curious to see the ripple, and 'Vdroop' under load. Computer loads are special in how they can go from a few to several hundred watts in milliseconds, and it presents a neat design challenge to make a nimble supply.
post #36 of 52
Thread Starter 
Hmm, no I havent, I had it on some fairly nice multimeters at work (took the power supply there for the machining). I have a four channel Oscope at home that Ill try it out on. Expect updates.

I have none of the filter or decoupling caps either, needless to say that Y rated filter caps, over current protection, and a real PCB could be easily added to something that Id trust to sell. Also they nicely discount volume sales.
post #37 of 52
Holy crap man, this is the coolest build log, coolest custom hardware build and the coolest idea of a mini build I have ever seen! I wish you could enter the Mod of the month contest. Epic build, infinite rep.

On a side note I feel ashamed for like 90% of my rep after seeing this.
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post #38 of 52
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LOL thanks, I am still going to gear up the oscilloscope and get those measurements. (been a bit busy finding a new job atm) Its really too bad I missed those contests by only a few weeks =P

Actually, I probably should have waited. I cant sit on a project like this though.
post #39 of 52
Amazing. Great work!
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post #40 of 52
Pretty cool build man.
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