DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 165 - diyAudio
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Old 18th April 2012, 03:12 AM   #1641
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to anyone who's looking for further mod, maybe you can replace the hex inverter with the better one: Buy Inverter Schmitt Trigger IC,Logic,VHC Family,Inverter Hex CMOS,SOIC14 Fairchild Semiconductor 74VHC04M online from RS for next day delivery.

someone recommended me this in the dacmagic mod thread, he said the improvement is noticeable. it's a cheap upgrade, should be worth the shot

i haven't tried this myself since my components hasn't arrived yet
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Old 18th April 2012, 03:21 AM   #1642
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The schematic I've seen shows the Hex inverter driving three LEDs, providing a static signal driving unused inputs, and generating the reset pulse.

Please explain how changing the hex inverter made a "noticable improvement".
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Old 18th April 2012, 03:38 AM   #1643
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Quote:
Originally Posted by TheGimp View Post
The schematic I've seen shows the Hex inverter driving three LEDs, providing a static signal driving unused inputs, and generating the reset pulse.

Please explain how changing the hex inverter made a "noticable improvement".
no idea. i'm just passing away information

maybe you should give them a try and see for yourself. since this mod costs almost nothing
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Old 18th April 2012, 03:58 AM   #1644
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My board hasn't arrived yet (due in 2-3 weeks), try it and let us know what you think.
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Old 18th April 2012, 05:37 AM   #1645
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i quoted the conversation between me and this guy, who recommended the inverter mod

Quote:
Regarding 74vhc14, is the distributor of the clock signal DacMagic. Before installing the Flea 5volts put another clock in and burned 74. The code "V" 74 "V" hc indicates an integrated low noise. Currently installed the 74HC14 is not low noise but it works.
is the ak4396 chip getting the clock signal from 74VHC04M as well in this module?

Last edited by idjoel2000; 18th April 2012 at 05:40 AM.
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Old 18th April 2012, 01:09 PM   #1646
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The kit is finished.

It works perfectly! Voltages are all in +/- 0.02V tolerance. I used two separate transformers.

Compared to the internal DAC of my Yamaha DSP-A1 (12 years old), and the new kit, the difference is noticeable. The original Yamaha DAC is very "harsh" sounding, the new kit with the NE5532 as an op-amp is much better. Much "warmer".

Maybe I should change it to and OPA627 or OPA2132?

Or just leave it.
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Old 18th April 2012, 01:43 PM   #1647
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idjoel2000 very good. IF the clock is buffered by the 74HC/VHC inverter, then there is the possibility of improving the SQ as jitter can be noise related.

In this case I agree it might be worth changing.

The schematic I saw did not buffer the clock with it, so it would make no difference in that version.
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Old 18th April 2012, 01:46 PM   #1648
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Quote:
Originally Posted by haik View Post
The kit is finished.

It works perfectly! Voltages are all in +/- 0.02V tolerance. I used two separate transformers.

Compared to the internal DAC of my Yamaha DSP-A1 (12 years old), and the new kit, the difference is noticeable. The original Yamaha DAC is very "harsh" sounding, the new kit with the NE5532 as an op-amp is much better. Much "warmer".

Maybe I should change it to and OPA627 or OPA2132?

Or just leave it.
try the 627, many people like them. but it comes in an expense as well, the price is quite steep
Quote:
Originally Posted by TheGimp View Post
idjoel2000 very good. IF the clock is buffered by the 74HC/VHC inverter, then there is the possibility of improving the SQ as jitter can be noise related.

In this case I agree it might be worth changing.

The schematic I saw did not buffer the clock with it, so it would make no difference in that version.
ahha.. it would not be worth the effort then

Last edited by idjoel2000; 18th April 2012 at 01:56 PM.
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Old 18th April 2012, 02:05 PM   #1649
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Quote:
Originally Posted by haik View Post
Maybe I should change it to and OPA627 or OPA2132?

Or just leave it.
OPA827, much cheaper than OPA627 and better sounding, IMHO.

Quote:
Originally Posted by idjoel2000 View Post
ahha.. it would not be worth the effort then
No, what TheGimp wrote is that in MINI2496 changing that component has no effect on audio...

On the PCB there's no clock at all to buffer...
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Old 18th April 2012, 02:06 PM   #1650
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Originally Posted by ClaveFremen View Post

No, what TheGimp wrote is that in MINI2496 changing that component has no effect on audio...
so you think changing the inverter would yield some result? i thought the mini2496 schematic is the same as in this one?
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