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Old 12th December 2010, 08:52 AM   #3521
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Shuggi, look at post #3407 for a list of things to check. This problem seems to occur quite often. Its probably something simple.

It's very unlikely that both the transformers would fail in the same way, they are very well made.
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Old 12th December 2010, 12:48 PM   #3522
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Quote:
Originally Posted by shuggi67 View Post
I'm hoping someone can shed some lite to the problem I'm having with DAC.
The DIYDAC is using A-20 transformers and was working fine until about 7 months ago when it decided to pack it in. problem is I get to sound not even static noise from any of the inputs, I have ran a multimeter from input to out and the path is unbroken, could it be the trannies ? and if so would it be safe to bypass them and go straight from the DAC to the ANALOG outs or would this blow the AMP up, it would be great if anyone can think of something as I would rather not have to buy a new one if its something simple that could be fixed.
I have also tried 3 different amps and about 4 different sets of cables, the DAC powers up with pretty lights but its as quite as a mouse.
The A20s are surely not the problem, unless you are running the trafos without series resistors between them and the dac chip, and grounding the primary center tap. If you are using the upsampling board you can remove it and put the 4 jumpers in. If it works now then the upsampler board is dead, which has happened to a few people.
If it still doesn't work then you will need a scope to check the I2S lines from the 8416 to the 4398 chip.

You can run the output to an amp with ground off the board and one output (plus or minus) through a cap, but not directly. There is 2.5VDC on the output legs of the dac chip.

Good luck!

Last edited by Bill Fuss; 12th December 2010 at 12:54 PM.
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Old 13th December 2010, 01:35 AM   #3523
legarem is offline legarem  Canada
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Originally Posted by tussi68 View Post
Do you still have those LL1690 for sale ?
Yes they are.

Thanks
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Old 13th December 2010, 01:40 AM   #3524
legarem is offline legarem  Canada
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Quote:
Originally Posted by JBdV View Post
Thank you guys, I have decided to give the LL1690 a try.
Unfortenately Legarem doesn't respond to my interest for his LL1690, so I will order a pair in Holland (Price is around 300 USD for a pair) I coul not find really cheaper offers.

I have had ESL57 and ESL63's, now I am using FinalSound 400I, I might go to Martin Logan Spire soon.

regards,

Jan
Hi Jan

I never saw your message for my transformers

They're still for sale

Thanks
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Old 13th December 2010, 08:43 PM   #3525
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Thanks lads I'll try all your suggestions
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Old 13th December 2010, 08:48 PM   #3526
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Quote:
Originally Posted by Bill Fuss View Post
The A20s are surely not the problem, unless you are running the trafos without series resistors between them and the dac chip, and grounding the primary center tap. If you are using the upsampling board you can remove it and put the 4 jumpers in. If it works now then the upsampler board is dead, which has happened to a few people.
If it still doesn't work then you will need a scope to check the I2S lines from the 8416 to the 4398 chip.

You can run the output to an amp with ground off the board and one output (plus or minus) through a cap, but not directly. There is 2.5VDC on the output legs of the dac chip.

Good luck!
Bill when you write about removing the upsampling board and put the 4 jumpers in what do you mean, I think I have the board with the daughter card that you just remove if you dont want upsampling.
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Old 17th December 2010, 10:00 AM   #3527
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hi guys

i am interested with this dac.

however there is 2 version. which one should i take?
1. CS8416 Digital receiver +Up-bit modular CS8421 + PCM1798 DAC
New 24/192 DAC DA CONVERTER CS8416+CS8421+PCM1798 USB - eBay (item 160518883450 end time Jan-11-11 23:34:13 PST)

or

2. DIR-9001 Digital receiver + Up-bit modular CS8421 + CS4398 DAC
Gigawork DIR-9001 24/192 Up-sampling DAC DA CONVERTER - eBay (item 160510993000 end time Dec-24-10 23:38:54 PST)

whats the pro and cons of both boards

thanks in adv

erwin
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Old 17th December 2010, 10:19 AM   #3528
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Quote:
Originally Posted by shuggi67 View Post
Bill when you write about removing the upsampling board and put the 4 jumpers in what do you mean, I think I have the board with the daughter card that you just remove if you dont want upsampling.
If you remove the daughter board there are 4 jumpers needed to restore the signal path. You should have received them with the Dac but I didn't either. They are the same as the ones on the input matrix.
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Old 17th December 2010, 10:35 AM   #3529
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Quote:
Originally Posted by milen007 View Post
hi guys

i am interested with this dac.

however there is 2 version. which one should i take?
1. CS8416 Digital receiver +Up-bit modular CS8421 + PCM1798 DAC
New 24/192 DAC DA CONVERTER CS8416+CS8421+PCM1798 USB - eBay (item 160518883450 end time Jan-11-11 23:34:13 PST)

or

2. DIR-9001 Digital receiver + Up-bit modular CS8421 + CS4398 DAC
Gigawork DIR-9001 24/192 Up-sampling DAC DA CONVERTER - eBay (item 160510993000 end time Dec-24-10 23:38:54 PST)

whats the pro and cons of both boards

thanks in adv

erwin
Erwin,

I've never heard either one of those combinations. Some like the 9001 better than the 8416 receiver.

The 1798 is a current output chip, the 4398 is a voltage output chip. If you had transformer output in mind the 4398 is definately the way to go unless you know what you're doing with I/V conversion.
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Old 17th December 2010, 11:59 AM   #3530
sendler is offline sendler  United States
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Quote:
Originally Posted by milen007 View Post
hi guys

i am interested with this dac.

however there is 2 version. which one should i take?
1. CS8416 Digital receiver +Up-bit modular CS8421 + PCM1798 DAC
New 24/192 DAC DA CONVERTER CS8416+CS8421+PCM1798 USB - eBay (item 160518883450 end time Jan-11-11 23:34:13 PST)

or

2. DIR-9001 Digital receiver + Up-bit modular CS8421 + CS4398 DAC
Gigawork DIR-9001 24/192 Up-sampling DAC DA CONVERTER - eBay (item 160510993000 end time Dec-24-10 23:38:54 PST)

whats the pro and cons of both boards

thanks in adv

erwin
If you have a soldering iron, you can do a direct out mod. I have read many different reports of direct out mods to CS43122, 4397, 4398, AK4393,4395, and 4396 and all report a big improvement in the sonics. I have never read of anyone that tried direct and went back to active. Except for the I out chips such as PCM1798/ 1794 which sound best with a tube I/V conversion. My simple transformer I/V with the 1798 is not quite as good as any of the V out chips I have. If you want to mod you will want the 4398 for sure. I bought several different modules and two boards in order to compare the many different modules. The DIR9001 definitely sounds way better than the CS8416 but has problems with it's input switching. One of my 9001 only locks to the RCA and one only locks to the optical regardless of the input selector settings. And, neither upsampler works at all with either 9001. Also ask the seller if you can purchase an 8416 module in case the 9001 still has bugs. My CS43122 dacs sound better than the PCM1798 but can't use the upsampler either due to a low level whine so I would go with the 4398. Too bad because even despite the whine, the upsampler does sound better even though I can already upsample in my SCR2496. Upsampling somewhere sounds better. I haven't read about any problems upsampling into the 4398. Maybe the upsampler is doing for the 8416, and then some, what the DIR9001 already does via their onboard clocks. I would go with an 8416, 4398, with the upsampler and purchase a 9001 for $20 as an experiment if you don't mind wasting the money in the case that it still doesn't work right. shipping is expensive so it will be cheaper to buy the spare module together with the initial purchase just in case. It should be no problem for the seller to sell you the other input board if you ask him. Be very careful when trying to remove the modules as the high quality milled pin sockets fit very tight and are brittle. Very easy to snap if the module doesn't come straight up.
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