Ryohei Kusunoki's TDA1543 DAC

cusanus · 15th March 2006, 06:44 AM

Hello a question for those who's built one.

I've followed Ryohei Kusunoki's design pretty closely. I've used 6 TDA1543 instead of 4 in parallel, and changed i/v conversion resistor to 400ohms and Rref at 240 ohms according to TDA1543calc utility floating around, driving with 8.5V supply.

Sound comes out. but there is something fishy going on.

I thought I've wired the blasted thing properly but DC voltage of left and right channel are different. the utility suggests 4.55V, but I get 4.25V on one channel and 4.7 on the other.

The mismatch is far too great in my mind to brush off as a chip to chip performance variation. And too small to be a failure of one of the chip's output.

A question for those of you out there who's played around with this chip. Has anyone experienced this behavior?

-Cusa

ErikdeBest · 15th March 2006, 06:59 AM

Hi Cusanus

I can't be of much help, but anyway want to suggest something. What is the tolerance of the resistors you're using? The differences you're mentioning are within a 10% marge, way too much for 1% resistors, but normal for some unmatched NOS carbon types.

Erik

cusanus · 15th March 2006, 07:42 AM

Hello Erik

I am using holco 's (1%) measured them as well. So this probably isn't it.

Thanks for the interest however.

-Cusa

ErikdeBest · 15th March 2006, 07:51 AM

Hi Cusanus

Well, than I don't know. I see that at Fedde's Nonoz III
DAC he is using a variable resistor, but this one has other function.

Erik

Andypairo · 15th March 2006, 07:55 AM

Try with one chip and the appropriate resistors and see if the mismatch is still there.

Did you cool the chips?

Cheers

Andrea

cusanus · 15th March 2006, 08:58 AM

Andrea,

Yes, that would have been my next course of action but I put the chips on a heat sink with a LOT of thermal compound. Just couldn't motivate myself to clean the mess up, pull out each chip and change resistors.

Guess I have to get my hands dirty.

-Cusa

15th March 2006, 06:44 AM	#1
cusanus diyAudio Member Join Date: Mar 2006 Location: Korea	Ryohei Kusunoki's TDA1543 DAC Hello a question for those who's built one. I've followed Ryohei Kusunoki's design pretty closely. I've used 6 TDA1543 instead of 4 in parallel, and changed i/v conversion resistor to 400ohms and Rref at 240 ohms according to TDA1543calc utility floating around, driving with 8.5V supply. Sound comes out. but there is something fishy going on. I thought I've wired the blasted thing properly but DC voltage of left and right channel are different. the utility suggests 4.55V, but I get 4.25V on one channel and 4.7 on the other. The mismatch is far too great in my mind to brush off as a chip to chip performance variation. And too small to be a failure of one of the chip's output. A question for those of you out there who's played around with this chip. Has anyone experienced this behavior? -Cusa

15th March 2006, 07:55 AM	#5
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	Try with one chip and the appropriate resistors and see if the mismatch is still there. Did you cool the chips? Cheers Andrea __________________ I don't believe in audiophile components - except when I can get them at frugal-phile(tm) prices

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15th March 2006, 06:59 AM	#2
ErikdeBest mostly thinkerer diyAudio Member Join Date: Mar 2003 Location: Maputo - Mozambique	Hi Cusanus I can't be of much help, but anyway want to suggest something. What is the tolerance of the resistors you're using? The differences you're mentioning are within a 10% marge, way too much for 1% resistors, but normal for some unmatched NOS carbon types. Erik

15th March 2006, 07:42 AM	#3
cusanus diyAudio Member Join Date: Mar 2006 Location: Korea	Hello Erik I am using holco 's (1%) measured them as well. So this probably isn't it. Thanks for the interest however. -Cusa

15th March 2006, 07:51 AM	#4
ErikdeBest mostly thinkerer diyAudio Member Join Date: Mar 2003 Location: Maputo - Mozambique	Hi Cusanus Well, than I don't know. I see that at Fedde's Nonoz III DAC he is using a variable resistor, but this one has other function. Erik

15th March 2006, 08:58 AM	#6
cusanus diyAudio Member Join Date: Mar 2006 Location: Korea	Andrea, Yes, that would have been my next course of action but I put the chips on a heat sink with a LOT of thermal compound. Just couldn't motivate myself to clean the mess up, pull out each chip and change resistors. Guess I have to get my hands dirty. -Cusa