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Old 3rd October 2007, 02:11 PM   #1
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Join Date: May 2007
Default PCM2902 and the missing audio in/out

I copied the circuit from the TI datasheet, but I am having no luck getting the analogue inputs or outputs to transfer data between PC and my external audio mixer. I ended up connecting my turntable phono pre-amp to pins 12 and 13 of the PCM2902, but still no luck. The PC recognises the USB chip, but after that nothing happens. Anyone got a better circuit than TI, or a clue why I am struggling with what appears to be a simple enough circuit from the datasheet?

All help appreciated from this Newbee.
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Old 3rd October 2007, 07:28 PM   #2
dangus is offline dangus  Canada
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Join Date: May 2004
Location: Vancouver Island
Have you told Windows to use the PCM2902 for audio input and output?

In Windows 2000 it would be:
Control Panel, Sounds And Multimedia, Audio, then select the "Preferred Device" for playback and recording.

The PCM2902 Evaluation Module schematic is a bit more thorough. (For what it's worth, the AdsTech RDX-150 "Instant Music" USB sound device appears to be based very faithfully on the Evaluation Module schematic, and it sells for a fraction of the price. It's more useful too since it has the Toslink transmitter and receiver, and the circuit board is larger so there's room for mods.)
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Old 6th October 2007, 08:35 AM   #3
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Thanks for the link to the datasheet. I shall start again and build that PCB. I need this for an important experiment.
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