uC DAC tester?

emuman100 · 3rd July 2004, 06:22 AM

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.

lucpes · 3rd July 2004, 06:58 AM

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

till · 3rd July 2004, 11:43 AM

I fear the PIC is not fast enough for this. I use a CDP.

emuman100 · 6th July 2004, 06:28 AM

Only if I could code assembly...

till · 6th July 2004, 10:30 AM

you could start and post a timing diagramm für you signal you want to make.

emuman100 · 9th July 2004, 12:44 AM

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.

jobstens · 9th July 2004, 09:48 PM

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

emuman100 · 11th July 2004, 09:29 PM

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.

jobstens · 11th July 2004, 10:13 PM

Here you are ;-)

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

Regards

Jobstens

emuman100 · 11th July 2004, 11:06 PM

Thanks! I'll try to draw up a design and give it a try on assembly.

I'll post my results here.

3rd July 2004, 06:22 AM	#1
emuman100 diyAudio Member Join Date: Jan 2004 Location: US	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.

3rd July 2004, 06:58 AM	#2
lucpes diyAudio Member Join Date: Dec 2003 Location: Iasi	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 __________________ Deep down inside.

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3rd July 2004, 11:43 AM	#3
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	I fear the PIC is not fast enough for this. I use a CDP.

6th July 2004, 06:28 AM	#4
emuman100 diyAudio Member Join Date: Jan 2004 Location: US	Only if I could code assembly...

6th July 2004, 10:30 AM	#5
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	you could start and post a timing diagramm für you signal you want to make.

9th July 2004, 12:44 AM	#6
emuman100 diyAudio Member Join Date: Jan 2004 Location: US	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.

11th July 2004, 09:29 PM	#8
emuman100 diyAudio Member Join Date: Jan 2004 Location: US	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.

11th July 2004, 11:06 PM	#10
emuman100 diyAudio Member Join Date: Jan 2004 Location: US	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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