dacs

[airmailed]

i'm amazed by the price of dacs - i have been away from this forum and electronics for a long time in a supercollider wilderness, when i return chips have got better and cheaper - not surprising i guess

 

but still, 2 channel 24/192 audio dacs for 10 euro blows my mind :smile:

 

http://uk.rs-online.com/web/c/semiconductors/data-converters/audio-dacs/?applied-dimensions=4294730111,4294496964&esid=cl_4294967294,cl_4294959918,cl_4294956699,cl_4294959345,cl_4294958709,cl_4294958376&m=1

 

oh & adc's - http://uk.rs-online.com/web/c/semiconductors/data-converters/audio-adcs/?applied-dimensions=4294730111,4294509620,4294507133&esid=cl_4294967294,cl_4294959918,cl_4294957494,cl_4294956699,cl_4294956603,cl_4294958419&m=1 i thought i saw a quad channel for less than 10 euro recently

Edited November 10, 2013 by airmailed

[TK.]

For 16 EUR you can get a nice presoldered Audio DAC + STM32F4 ;-) 

http://uk.rs-online.com/web/p/processor-microcontroller-development-kits/7458434/?searchTerm=stm32f4discovery&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D656E266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C772D5C2E2F252C5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D424552267573743D73746D33326634646973636F766572792677633D424F544826

 

See also http://www.ucapps.de/mbhp_core_stm32f4.html

 

Best Regards, Thorsten.

[airmailed]

i get distracted for only 6-8 years and find you've developed several generations of new hardware in the meantime, amazing :)

 

someone pointed this board out to me recently - no audio dac, but does have a screen (i expect you saw it already)

 

http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF259090

 

and this one (which needs a 4A supply) - http://www.hardkernel.com/renewal_2011/products/prdt_info.php?g_code=G137510300620

[pilo]

I use this DAC for an ADAT converter:

http://www.pcm63.com/?222,al1201

 

It's cheap and comes in a SOIC package (easy to solder). It can works with I2S (actually it doesn't require master and bitclock, only LR clock (48Khz) and data).

The only drawbacks are it can do only 48Khz max, and its now an obselete chip.

 

I've got eagle schematic + board (single sided) if you're interested.

[ilmenator]

I'd be very interested in this, too - I checked some old posts of yours, but all the links to membres.lycos.fr are dead...

 

Best, ilmenator

[pilo]

Yes I need to find a place to put them back on line.

As you find, it started on an old thread on this forum, 10 years ago... I get back the project recently (it was working, but I didn't do anything right the first time, so now I'm finishing it in a better way).

[freddy]

<blockquote class='ipsBlockquote'data-author="pilo" data-cid="160759" data-time="1384424215"><p>

I use this DAC for an ADAT converter:</blockquote>

ADAT? This is about DACs but did you also build the full 8ch I/O from/to ADAT to/from analogue? If so, any chance for the schems? That'd be exactly what I'm looking for in a DIY format, not expensive commercial products...

Cheers,

freddy

[pilo]

Yes, this is for a full ADAT 8 in/8 out.

The AL1201 DAC was made by Alesis-semi, they also made the AL1101 (ADC) and AL1401/AL1402 adat encoding/decoding cheap. Adn they provide schematic for this too.

As I said in my other post, those cheap are now obselete, you can still find datasheet here :

http://www.wavefrontsemi.com/index.php?products

 

you can still find them at http://www.pcm63.com (and they are cheap).

 

Of course I can share my schematic and PCB (but keep in mind that I'm no expert in PCB, and even the schematic design is not so good).

Also, this is the same design as the Berhinger ADA8000 (minus the input preamp), which is VERY cheap (I started this project before Berhinger did this unit).

The interesting things in my design is that you can use other DAC or ADC than the AL1201 or AL1101, use something elese for adat encoding/decoding (FPGA) as it's modular.

 

I don't know where I can upload those and put some information, some kind of a blog maybe?

[freddy]

I guess this is for my own interest only (at least for now), I've emailed you with email address. Thanks for the other details!

Edited November 17, 2013 by freddy

[Shuriken]

I don't know where I can upload those and put some information, some kind of a blog maybe?

 

If you click on the More Reply Options, you can attach files to your post.

[ilmenator]

I agree, this thread is a good place to upload!

[pilo]

Ok!

So here's the DAC (sch + pcb).

 

As I said, keep in mind that it maybe not perfect! (for example, on the schematic the DEM pin is connected to +5V, but in most application you want DEM off, so it needs to be wired to GND, on the PCB there's a pad to wire it to 5V or GND).

It needs a +12V/-12V +5V analog power supply and a +5V digital supply (analog and digital ground are NOT connected on the PCB, they should be at some point,  I did this on my PSU pcb).

 

edit : mm it seems I can't attached sch and brd file in this post

[pilo]

I put brd ans sch file in a zip and it works :)

al1201 dac.zip

[airmailed]

thanks for this, i've been looking at expert sleepers es3 recently which uses to adat to provide 8 channels of 10v cv for modular synths http://www.schneidersladen.de/en/expert-sleepers-es-3-mk2-aluminium.html

[pilo]

You could use a simple output for the AL1201 (look in the datasheet) if you don't need a very good "sound" (I guess for cv it should be fine).