PCM2902 and the missing audio in/out

Sranang_Boi · 3rd October 2007, 02:11 PM

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.

dangus · 3rd October 2007, 07:28 PM

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.)

Sranang_Boi · 6th October 2007, 08:35 AM

Thanks for the link to the datasheet. I shall start again and build that PCB. I need this for an important experiment.

3rd October 2007, 02:11 PM	#1
Sranang_Boi diyAudio Member Join Date: May 2007	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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3rd October 2007, 07:28 PM	#2
dangus diyAudio Member 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.)

6th October 2007, 08:35 AM	#3
Sranang_Boi diyAudio Member Join Date: May 2007	Thanks for the link to the datasheet. I shall start again and build that PCB. I need this for an important experiment.