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Old 3rd July 2004, 06:22 AM   #1
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Default uC DAC tester?

Hello,

I'm interested in a simple hardware DAC tester that will create a 1kHz sine in a S/PDIF format. I'm looking for a TTL signal, the conversions I can do myself. I wonder if a small PIC or uC could create a 1kHz sine in S/PDIF format when powered up and output TTL so I can run it into jwb's DAC without having to use that big clunky dvd player I have. Anyone have done this before?

Thanks.
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Old 3rd July 2004, 06:58 AM   #2
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Take a decent soundcard with digital out, a PC, and the RMAA program from http://audio.rightmark.org/ .

Here's a test I did on mine: http://www.diyaudio.com/forums/showt...&postid=429605
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Old 3rd July 2004, 11:43 AM   #3
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I fear the PIC is not fast enough for this. I use a CDP.
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Old 6th July 2004, 06:28 AM   #4
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Only if I could code assembly...
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Old 6th July 2004, 10:30 AM   #5
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you could start and post a timing diagramm fr you signal you want to make.
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Old 9th July 2004, 12:44 AM   #6
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till,

I want to generate a 1kHz sine with a 44.1kHz sampling frequency at 16 bits per sample. I have no idea what the data would look like for a 1kHz sine at a reasonable level enough to be heard through a line driver which is fed into an amplifier. A timing diagram would be a perfect start, but I don't know what the data would look like. Would you be able to help?

Thanks.
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Old 9th July 2004, 09:48 PM   #7
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Hi emuman100 !

I have developed this little circuit for you. It outputs I2S Data. For S/P-DIF you need an additional converter.

Details are your job ;-)

Have fun


Jobstens
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File Type: zip 1khz-digi.zip (13.4 KB, 69 views)
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Old 11th July 2004, 09:29 PM   #8
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jobstens,

Thank so much, this is just what I needed. Thing is, I don't know how to convert the sample data in the text file to a binary to burn on an EPROM. Do you have a binary for me?

Thanks.
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Old 11th July 2004, 10:13 PM   #9
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Here you are ;-)

Please let me know how it works. Maybe you could post the whole circuit here ?!?!


Regards

Jobstens
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File Type: zip 1khzbin.zip (1.6 KB, 16 views)
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Old 11th July 2004, 11:06 PM   #10
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Thanks! I'll try to draw up a design and give it a try on assembly.

I'll post my results here.
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