DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 77 - diyAudio
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Old 23rd October 2011, 09:44 PM   #761
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Join Date: Oct 2011
Hi - I've just bought this 4396 kit and have yet to start any mods. I do have a question though I intend to integrate into a single DAC/AMP with an Icepower module.

I intend to use the Op Amp output (having adjusted the LPF to the correct values). Will this output drive a 125ASX2 ICEPOWER module directly? I hear the input impedance is low on the Icepower.

If I want a volume control, where should I put it? Should I add another opamp preamp prior to the Icepower?

Appreciate any advice!

Simon
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Old 24th October 2011, 12:45 AM   #762
erin is offline erin  Australia
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Quote:
Originally Posted by Simes123 View Post
I intend to use the Op Amp output (having adjusted the LPF to the correct values). Will this output drive a 125ASX2 ICEPOWER module directly? I hear the input impedance is low on the Icepower.
If I want a volume control, where should I put it? Should I add another opamp preamp prior to the Icepower?
Simon
Occasionally you do get clicks and pops or buzzing sounds when turning on this kit, or changing sample rates as the PLL locks on the digital reciever. So a volume control will save your speakers and hearing under these circumstances. A basic pre-amp or buffer kit with a volume pot will do the job. The low input impedance of the B&O amp is not generally an issue for most op-amps to drive. But check the datasheets if in doubt.
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Old 24th October 2011, 01:11 AM   #763
i2k92 is offline i2k92  Indonesia
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Quote:
Originally Posted by fmahia View Post
A quick reply to i2k92: I don't know more than what I've read in the seller text about the Valab DSIX board. It's a reclock board for the SPDIF signal. I've no mesurement of its real effect on the jitter but I can tell that it provide a really good improvement with my computer SPDIF out. The sound is really more detailed and the bass are very good.
Thanks a lot. What kind of transformer do you use with the board ? The seller mentions that it requires 1.5A which IMHO is surprisingly big for such small digital circuit.
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Old 24th October 2011, 04:58 PM   #764
rss388 is offline rss388  United States
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Hello all,

I just bought one of the 4396 kit on eBay and putting together a list of mods to integrate as I assemble. One thing that I thought but did not find any discussion on is the use of a precision reference rather than just a cap across Vref pins. In my past industrial automation design experience, I have had very good and cost effective results from the likes of Linear Technology LT1021. Anyone with thoughts or experiences with similar approach?
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Old 24th October 2011, 05:10 PM   #765
rss388 is offline rss388  United States
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Quote:
Originally Posted by rss388 View Post
Hello all,

I just bought one of the 4396 kit on eBay and putting together a list of mods to integrate as I assemble. One thing that I thought but did not find any discussion on is the use of a precision reference rather than just a cap across Vref pins. In my past industrial automation design experience, I have had very good and cost effective results from the likes of Linear Technology LT1021. Anyone with thoughts or experiences with similar approach?
I guess I should be complete by saying I propose generating a separate Vref with the LT1021 back to 7815 and separate Vref from AVdd.
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Old 24th October 2011, 05:39 PM   #766
fmahia is offline fmahia  France
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Quote:
Originally Posted by i2k92 View Post
Thanks a lot. What kind of transformer do you use with the board ? The seller mentions that it requires 1.5A which IMHO is surprisingly big for such small digital circuit.
I use a 12V 6800mAH rechargeable Li-ion battery for best result.
I've tried successfully a linear power supply with a LT1083 but with an oversized 40VA transfo so I can't tell you about minimum requirement.
I've also tried the Li-ion battery with the DSIX + USB Isolator (Adum chip) + TeraLink X2-M (USB to SPDIF) without any problem, good performance and very long lasting.
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Old 25th October 2011, 01:37 AM   #767
erin is offline erin  Australia
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Quote:
Originally Posted by rss388 View Post
Hello all,

I just bought one of the 4396 kit on eBay and putting together a list of mods to integrate as I assemble. One thing that I thought but did not find any discussion on is the use of a precision reference rather than just a cap across Vref pins. In my past industrial automation design experience, I have had very good and cost effective results from the likes of Linear Technology LT1021. Anyone with thoughts or experiences with similar approach?
I have read on other threads about people doing the same thing as you propose, so It should not be a problem.
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Old 25th October 2011, 02:29 AM   #768
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guys would like to ask again where are the pads that needs to be shorted in order to just use one AC voltage?
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Old 25th October 2011, 05:46 AM   #769
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Originally Posted by erin View Post
I have read on other threads about people doing the same thing as you propose, so It should not be a problem.
Hello Erin,
thanks for your reply. I have decided not to use the LT1761, or any other chip regulator, but to use Greg Ball's "Minireg." These are a low noise (<1uV) and low impedance discrete that Grg designed to replace the 78xx/79xx family and have a very small PCB. Either a PCB or a complete kit is available

I currently use them on the DAC and analog out of my Rotel CDP and on Greg's Optivol (LDR volume control) and FET buffer that I use as a preamp.

The restriction with the Minireg is that the max current it can supply is 100mA. But that is more than enough for this stuff.

Greg's website and SKA forum is: SKA sponsored Audio Forum - Index and the Minireg thread is: SKA sponsored Audio Forum - MiniReg discrete low noise Regulator

Looking at another part of this kit, has anyone done anything with the PLL filter components on the CS8416? I mean using SMD components for C36 and C5 (COG/NPO types) and an SMD for R2. From the photos I think I see how to do it without doinf too much violence to the tracks. Several years ago I built a few TDA1543 DACs with CS8412 receivers and used SMD components soldered as close to the PLL loop filter pins as I could get them (different filter values of course). Post #34 on this thread tells the benefit of SMD components in this location. It's worth a read : Cs8412

Last edited by jnewbold; 25th October 2011 at 05:50 AM.
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Old 25th October 2011, 09:17 AM   #770
erin is offline erin  Australia
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You are totally right, that improvements to the PLL will be beneficial. Problem is that the tracks are arranged for leaded components and not optimised for SMD parts. But I also think that you could fit them on the board, with the current track layout, perhaps SMD will have no advantage? Perhaps you can try both and tell us if you notice any difference.
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