DIY ADC!

[nacho459]

I posted in a topic over at TapeOp that I'm looking for a good 2ch ADC unit for transferring mixes from 1/4" to 16/44.1. If anyone knows of plans or a kit for a simple converter that would do that let me know. Or if any of you have an inexpensive (under $2K) ADC that rules, let me know. Oh yeah, I don't really need a DAC, although I guess it would be nice for monitoring.

 

[mcs]

Simple? How about this one? :grin:

Best regards,

Mikkel C. Simonsen

 

[maneco]

NIce board!

pcm what? :grin:

 

[electronaut]

Hey mcs,

That thing rules! Care to share some info???

-E.

 

[mcs]

[quote author="maneco"]NIce board!

pcm what? :grin:[/quote]
Thanks and PCM1800. It actually works very well, and it's cheap and easy to get - what more could you want :grin:

To use for recording all that's needed is an S/PDIF or AES transmitter. I don't think I have a photo of that board, but there's a drawing here: http://stiftsbogtrykkeriet.dk/~mcs/SPDIFTX_pcb.gif

Best regards,

Mikkel C. Simonsen

 

[maneco]

mmm...pcm1800 i guess

 

[mcs]

[quote author="electronaut"]Care to share some info???[/quote]
There's a schematic here: http://stiftsbogtrykkeriet.dk/~mcs/ADCon3.gif

Not terribly complicated... I can dig out the Gerbers also if anybody's interested.

Best regards,

Mikkel C. Simonsen

 

[maneco]

Thanks for sharing! :thumb:
are you using a crystal transmiter chip for interfacing?

 

[maneco]

I'll add spdif output to my 1272 when it's finished!

:razz: :razz: :thumb:

 

[mcs]

[quote author="maneco"]are you using a crystal transmiter chip for interfacing?[/quote]
Yes: http://stiftsbogtrykkeriet.dk/~mcs/SPDIFTX_sch.gif

Best regards,

Mikkel C. Simonsen

 

[maneco]

Thanks again!
hey,those are transformers that i know how to diy! :thumb:

 

[nacho459]

Wow that looks simple enough. And it sounds really good? Like it would blow away my 001 converters?

If so, do you have more PCB's, a parts list, etc. I really don't understand digital circuits and stuff like this. I kinda understand tube amps and stuff like that, this is a whole other beast. I would probably need something like a kit or at least a PCB and parts list to make this happen.

What's a S/PDIF transmitter? Is it just something that would convert the digital output of the ADC to S/PDIF?

Thanks much! :guinness:

 

[Flatpicker]

I keep wondering about the Behringer ULTRAMATCH PRO SRC2496. It's only around $130US and I bet all you have to do is improve the in/outs with decent opamps and caps. Much easier and cheaper than DIY. If you want perfection and don't mind to throw money at it, use Lundahls or Jensens. Don't know how much clock jitter there is, but it could sound great. I'd certainly try this before buying a higher-end AD-DA like the RME, etc.

I'll probably be giving this a shot by mid-summer - I just wish someone would beat me to it! :wink:

 

[maneco]

Yes,the spdif transmitter converts the signals from the a/d converter,which are 3 or 4 digital signal (bitclock,fsync,data and master clock) into an spdif signal...
The advantage of using good transformers is that you isolate teh audio from the posibly noisy computer ground,in case you're interfacing to one...
I have built many usb sound cards using the pcm2902 chip from texas instruments,but the analog audio quality is horrible...it also has an spdif input,so my path could be :

1272 >>>>ADconverter>>>>pcm2902>>>>USB

Wish me luck

(i think i can contribute with the digital part,and i'll share my findings)

 

[chrissugar]

Hey Nacho

If you have 2000$ for AD converters you should buy this:
http://www.mercenary.com/laen44wi2cha.html

chrissugar

 

[ijr]

Before dui ad converter it is better to diy normal clock then talk ))

 

[nacho459]

[quote author="chrissugar"]If you have 2000$ for AD converters you should buy this:http://www.mercenary.com/laen44wi2cha.html[/quote]

My whole idea of looking for new converters under $2000 was the hopes to find one used for under $1000. There's an older Apogee Rosetta on E bay that I'm gonna jump on. STAY BACK!