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Old 19th October 2007, 06:02 AM   #11
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Now I implemented 5 bit, then try to listen some music.
S/N ratio by theory is 36dB, yes I can listen music and some quantization noize.
10 bits more...
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Old 21st October 2007, 05:12 PM   #12
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Loop back by Edirol UA-1 EX, digital out - Analog in at speaker terminal.
THD+N 2.2% is pretty bad, but anyway it's working.

with magnified view of received wav, I can see some gritch around negative peak. maybe one of lower current sink has trouble...
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Old 21st October 2007, 05:53 PM   #13
Eva is offline Eva  Spain
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Interesting, but, how did you manage to get those DIY-looking prototype PCBs with thru-hole plating? Are they really DIY?
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Old 21st October 2007, 07:22 PM   #14
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Of course not a DIY board..
made by ExpressPCB.
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Old 24th October 2007, 07:29 PM   #15
torzsok is offline torzsok  Hungary
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How is it going?

Strange that there is no interest from others here. I can't offer any serious advice either being a newbie, but I like the idea and I would love to see how it develops. Keep it up!

torzsok
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Old 24th October 2007, 07:36 PM   #16
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I found some 74HC08/74HC02 is out-of-order, Y pin is 5V fixed or A input goes through without gating

(maybe I shorted 5V and output while making / testing)
Now waiting delivery from Digikey. I did not ordered spare parts!
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Old 24th October 2007, 07:46 PM   #17
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Quote:
Strange that there is no interest from others here. I can't offer any serious advice either being a newbie, but I like the idea and I would love to see how it develops. Keep it up!
Yea I'm interested too, though I really have nothing to add. It's a neat concept and I hope it pans out well.

I bet the PCB probably cost you big $$$ from express pcb...

nice work
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Old 25th October 2007, 03:23 AM   #18
BWRX is offline BWRX  United States
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Originally posted by Boris_The_Blade
Yea I'm interested too, though I really have nothing to add.
Likewise. It's a very interesting and complicated project.
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Old 28th October 2007, 05:37 AM   #19
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Thank you for interests.

After bit-by-bit measurement, re-soldering, bridge found! and cleaning, ... now all bit is working correct.

0.3% THD is not a fame as DAC

Now listening some musics.
nice. good at presentation of depth. musical enough.

best of the features is "interesting". only a pile of 74HCxx, 4580D, analog switch and TR/FET, C/R are driving speaker, from non tweaked PCM signal (and Reference Voltage, used for volume control).
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Old 28th October 2007, 06:33 AM   #20
MaxS is offline MaxS  France
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Default CPLD could became your friend !

Hi,

First of all, nice project.

You're using so many 74s than, to my mind, you can think to use CPLD.
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