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Old 24th April 2011, 05:38 PM   #1
ptah is offline ptah  United States
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Default PCI vs. PCI-Express Sound Card Supply Voltages

Does anyone know how PCI Express sound cards derive sufficient positive and negative voltages to drive the op-amp stages?

The PCI bus supplies + and - 12V. The PCI Express bus supplies only +5V and +3V.
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Old 24th April 2011, 07:50 PM   #2
ptah is offline ptah  United States
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Default PCI vs. PCI-Express Sound Card Supply Voltages - Update

I had to reply to my own thread to include the PCI and PCI-E bus pinouts so everyone would know what I was talking about. The "editorial" staff does not allow edits after 30 minutes.

Anyway ... pinout tables are attached.
Attached Files
File Type: pdf PCI Pinout.pdf (142.0 KB, 45 views)
File Type: pdf PCI-E Pinout.pdf (86.7 KB, 29 views)
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Old 24th April 2011, 08:18 PM   #3
JZatopa is offline JZatopa  United States
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On my Xonar STX you connect a power molex to the card to power the boards outputs. If you want you can build a regulated linear supply to drive the card.
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Old 30th April 2011, 02:45 PM   #4
ptah is offline ptah  United States
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Thanks DJ, I had not seen this type of sound card. I wonder if that mean the pre-amp stage is class A?
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