DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 264 - diyAudio
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Old 5th January 2014, 06:12 PM   #2631
tofurky is offline tofurky  United States
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Join Date: Jan 2013
hey,
yes they are kind of pricey, although i got them about 50% off retail during a sale at partsconnexion. but the price of the three did approach the cost of the mini2496 pcb + bom ;-)
not trusting my ears, i dusted off the laptop and booted vista to run RMAA.
i had an old test .sav from several months ago showing the mini2496 as it was before installing the bellesons. i don't remember the exact test parameters used the first time, and the line level output from the dac easily overpowers my usb sound blaster that i use for testing, so it's always a challenge to get the levels right. i think i did use the same volume though (100% out spdif from my cm6631, 25% line in on the sound blaster).

the first result labeled 'mini2496' is the dac as it was; the second two are with the belleson. the one with the ridiculously low noise floor was reproducible, but using a different input sampling rate/bit depth (48000/16 vs 96000/24). i'm not sure if it was a fluke/error but i ran the test several times with the same result.

the posted results don't reflect the limits of the dac but are useful to detect improvements.

i think the first two results are a more apples-to-apples comparison w/rt testing parameters.

-matt
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Last edited by tofurky; 5th January 2014 at 06:22 PM.
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Old 5th January 2014, 06:39 PM   #2632
esgigt is offline esgigt  Netherlands
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Thanks Matt!

I understand that in the -120 db S/N range, not much improvement is to be expected in terms of measurements. This is clearly indicated in the graphs (I somehow don't believe the -160db ). You don't mention the audible differences... can you expand on that subject?

Thanks,
Edwin
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Old 7th January 2014, 06:48 PM   #2633
esgigt is offline esgigt  Netherlands
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Join Date: Dec 2013
DIY Kit recieved! And compared to other orders I placed in Asia, rather fast.

First I'll check-out the BOM. Got 3 15.000uF caps (ok. it's not 22.000 but it will do nice I guess).... The ESR measures less than 0.01 Ohms.

Probably I'll also add some CLC filtering in the AC-lines to the board.

Think I'll also order the enclosure....

Anybody experience with the enclosure?
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Old 9th January 2014, 02:59 PM   #2634
esgigt is offline esgigt  Netherlands
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Join Date: Dec 2013
Thumbs up First check the package...

Remarkable!

Having read several relevant posts in this thread, the R and C values for the I/V and filter still are according to the 93 and 95 requirements, no matter the 96 replaced the 93 some two years ago.

To be honest: this was what I expected. The resistors also proved to be 5% types, since they are in the signalpath, I will replace them by selected 1% types of the correct value. For the 680pf caps I want some nice foil types.

A good reason to do some shopping tomorrow
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Old 15th January 2014, 12:34 PM   #2635
esgigt is offline esgigt  Netherlands
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Default First: smoketest

Building completed.

I configured the PCB for only 15Vac-0V-15Vac and tested with a 9V battery.

Both voltage regulators for the opamp (not connected yet) provided some rail (6a7 volts), so these regulators appeared to be functional. Also the regulator for the digital supply worked. I got approx. 3.3V on the unloaded LED ports.

After connecting LEDs the Power, 96K and ERROR LEDs came ON. The NOAUDIO stayed OFF. There was no SPdif cable connected.

Can somebody confirm these findings before I proceed with connecting the 15+15V transformer?
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Old 16th January 2014, 08:13 PM   #2636
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i just order the CS8416 kit and i think:
can i use battery's instead waist lots of money on PS?
thanks
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Old 16th January 2014, 08:50 PM   #2637
esgigt is offline esgigt  Netherlands
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Quote:
Originally Posted by erez1012 View Post
i just order the CS8416 kit and i think:
can i use battery's instead waist lots of money on PS?
thanks
At the end of the day a regular PS will be cheaper and more reliable, I think.
You can operate the DAC with a single 15+15V transformer. 500mA will do as a minimum.

But 3 9V batteries will do too.. just lose the 78 and 79 voltage regulators
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Old 16th January 2014, 09:32 PM   #2638
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Join Date: Dec 2009
hi esgigt
as i read this trade now (page 50) i do not want the preamp, so i don't need the +-15dc !
i steel don't understand what's is the best cap or transformer instead the op amp.
thanks
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Old 16th January 2014, 09:57 PM   #2639
esgigt is offline esgigt  Netherlands
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Join Date: Dec 2013
Quote:
Originally Posted by erez1012 View Post
hi esgigt
as i read this trade now (page 50) i do not want the preamp, so i don't need the +-15dc !
i steel don't understand what's is the best cap or transformer instead the op amp.
thanks
Ok, so you don't need the opamp. One problem less

As far as I understood, using the right caps is critical to obtain the best quality possible, starting with the cap for the SPdif Input. Just download Claves BOM. This will be a good guide.
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Old 16th January 2014, 11:45 PM   #2640
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yes i follow the bom.
what about the battery, its good solution?
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