DIY ADC info ?

audiosteve · 19th March 2007, 06:34 PM

I have searched the threads and am coming up short.
Does anyone know of a good DIY design or kit for an ADC? I have found plenty of data on DACs, but data on an ADC seems sparse.
I need something to feed a DSP.

Thanks,
Steve

rfbrw · 20th March 2007, 07:45 AM

How about a Cirrus Logic evaluation board ? It shouldn't be too hard to get one.

Werner · 20th March 2007, 08:01 AM

One possible way could be to buy an ADC evaluation board from TI or AD, add suitable power supplies, and adapt the analogue front-end to your needs.

I've got a board for the PCM4202, but haven't got the time yet to play with it.

audiosteve · 20th March 2007, 02:27 PM

Good suggestions. I can probably get an EVAL board from Cirrus. I have an in there. wink

But eval boards are usually larger and have more components on them then necessary for just the base functionality. I am trying to find something more compact and purpose built. If any one else has any suggestions I am still listening. If all else fails, I will go the eval route.

Thanks,
Steve

Nisbeth · 20th March 2007, 10:27 PM

The only real DIY ADC I'm aware of: http://www.beis.de/Elektronik/ADDA2496/ADDA2496.html

/U.

Quince · 20th March 2007, 10:55 PM

http://tinyurl.com/2t8a4f

audiosteve · 21st March 2007, 12:52 AM

Thanks for your suggestions. It looks like either of the DIY projects could be made to suit my needs. I may be able to get a freebie CDB5381 from Cirrus but if not the price for this board at Digi-Key is $360!! That's a non-starter.

hagtech · 21st March 2007, 05:15 AM

You can try something like this. Use 0.22uF or larger capacitors to couple to the inputs. I forget exactly, takes something like 0.5Vrms input for full scale.

I use "Audacity" software for recording. The chip also plays back with DAC outputs. Or create and SPDIF signal to connect to another DAC. Very layout sensitive.

jh

audiosteve · 21st March 2007, 06:33 AM

Thanks for that post Jim. If I could use spdif it would probably do the trick but I need something with LJ or I2S out. I'm still looking and won't make a decision until I think I have done enough homework. I'm really amazed that there are a million DAC's out there but precious few resources for a DIY ADC.

rfbrw · 21st March 2007, 07:30 AM

Quote:

Originally posted by audiosteve
Thanks for that post Jim. If I could use spdif it would probably do the trick but I need something with LJ or I2S out. I'm still looking and won't make a decision until I think I have done enough homework. I'm really amazed that there are a million DAC's out there but precious few resources for a DIY ADC.

Have you considered designing one ?

19th March 2007, 06:34 PM	#1
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	DIY ADC info ? I have searched the threads and am coming up short. Does anyone know of a good DIY design or kit for an ADC? I have found plenty of data on DACs, but data on an ADC seems sparse. I need something to feed a DSP. Thanks, Steve

20th March 2007, 08:01 AM	#3
Werner diyAudio Member Join Date: Jan 2002 Location: Belgium	One possible way could be to buy an ADC evaluation board from TI or AD, add suitable power supplies, and adapt the analogue front-end to your needs. I've got a board for the PCM4202, but haven't got the time yet to play with it. __________________ bring back dynamic range

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20th March 2007, 07:45 AM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	How about a Cirrus Logic evaluation board ? It shouldn't be too hard to get one.

20th March 2007, 02:27 PM	#4
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	Good suggestions. I can probably get an EVAL board from Cirrus. I have an in there. wink But eval boards are usually larger and have more components on them then necessary for just the base functionality. I am trying to find something more compact and purpose built. If any one else has any suggestions I am still listening. If all else fails, I will go the eval route. Thanks, Steve

20th March 2007, 10:27 PM	#5
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	The only real DIY ADC I'm aware of: http://www.beis.de/Elektronik/ADDA2496/ADDA2496.html /U.

20th March 2007, 10:55 PM	#6
Quince Banned Join Date: Mar 2007	http://tinyurl.com/2t8a4f

21st March 2007, 12:52 AM	#7
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	Thanks for your suggestions. It looks like either of the DIY projects could be made to suit my needs. I may be able to get a freebie CDB5381 from Cirrus but if not the price for this board at Digi-Key is $360!! That's a non-starter.

21st March 2007, 05:15 AM	#8
hagtech diyAudio Member Join Date: Mar 2002 Location: Hawaii	You can try something like this. Use 0.22uF or larger capacitors to couple to the inputs. I forget exactly, takes something like 0.5Vrms input for full scale. I use "Audacity" software for recording. The chip also plays back with DAC outputs. Or create and SPDIF signal to connect to another DAC. Very layout sensitive. jh

21st March 2007, 06:33 AM	#9
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	Thanks for that post Jim. If I could use spdif it would probably do the trick but I need something with LJ or I2S out. I'm still looking and won't make a decision until I think I have done enough homework. I'm really amazed that there are a million DAC's out there but precious few resources for a DIY ADC.