tomb
Member of the Trade: Beezar.com
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Man, you guys are tough!
The PCI standard started with 5V and went on to lower it with the later standard to 3.3V. If a sound card is supplying more than that, then it's using a buck-boost circuit and those have their own particular problems with noise and trash in the audio frequencies.
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Yeah, slight of hand with the voltage - ever scoped one? I haven't, but there's a reason high-fidelity goes with linear-regulation most often and stays away from such things.
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I made that qualification and stated that it was only an estimate, but maybe it was some more magic?
EDIT: OK, I'll claim ignorance on PCIe - I thought that was reserved for video. If not, I suppose it's possible you have a true 12V supply - is that in the PCIe standard? I haven't found anything to document it, yet.
OK - busted on the PCIe - it does appear the PCIe standard supplies more wattage through a 12V connection. OK, you got me on that one. How many PCIe sound cards do you think people are running now? I just built a PC using the latest components last year and there was only one PCIe slot on my Intel motherboard (for the graphics card). I can't imagine that they're very ubiquitous yet.
Originally Posted by evilking /img/forum/go_quote.gif Absolute ignorance! |
Man, you guys are tough!
The PCI standard started with 5V and went on to lower it with the later standard to 3.3V. If a sound card is supplying more than that, then it's using a buck-boost circuit and those have their own particular problems with noise and trash in the audio frequencies.
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Since when have PCIe cards run on 5 volts? Go look it up. Somehow the STX runs on 12 volts, maybe it's magic! |
Yeah, slight of hand with the voltage - ever scoped one? I haven't, but there's a reason high-fidelity goes with linear-regulation most often and stays away from such things.
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And those calculations give RMS voltage not peak! So the 4.38volts required for 115dB (lets pretend we have actual tin ears to withstand this volume) is actually 6.194v peak, which is definitely achievable with a modern soundcard running on 12v. EK |
I made that qualification and stated that it was only an estimate, but maybe it was some more magic?
EDIT: OK, I'll claim ignorance on PCIe - I thought that was reserved for video. If not, I suppose it's possible you have a true 12V supply - is that in the PCIe standard? I haven't found anything to document it, yet.
OK - busted on the PCIe - it does appear the PCIe standard supplies more wattage through a 12V connection. OK, you got me on that one. How many PCIe sound cards do you think people are running now? I just built a PC using the latest components last year and there was only one PCIe slot on my Intel motherboard (for the graphics card). I can't imagine that they're very ubiquitous yet.