noise problem with TDA1541

vincent_brient · 5th March 2005, 12:26 PM

I made a no-oversampling DAC using a CS8412 and a TDA1541 (not TDA1541A) chip. The connection between CS8412 and TDA1541 is similar to:
http://users.verat.net/~rogic/1541/1...ev1_1b_sch.pdf
I used a NE5532 I/V.
I works fine for a 0dB 1KHz test tone. Could you confirm that the output signal has a 3.7V offset?
For low amplitude signal test I get a very distorded sound, even a -90dB 1KHz test tone make a huge distortion-noise and when I press pause on the CD player the noise totally disappears.

Any idea?

I have succeded to make a NOS dac using AD1862 and an OS dac using AD1955 and CS8412 and I had no problem. I will also test pcm56, ad1865 and pcm 1852.

vincent_brient · 5th March 2005, 05:09 PM

I found th problem. When I solder a 470p capacitor between pin 16 and 17 the problem disappears so my chips are TDA1541A although I read TDA1541 R1 on top of them.

JohnW · 7th March 2005, 10:26 AM

Vincent,

Now it appears you have it working, what does it sound like?

John

Fin · 8th March 2005, 11:30 AM

Quote:

Originally posted by vincent_brient
I found th problem. When I solder a 470p capacitor between pin 16 and 17 the problem disappears so my chips are TDA1541A although I read TDA1541 R1 on top of them.

They might still be the "Non A" version. I have read that Philips may not have included the internal capacitor between pins 16 and 17 - even though it shows it on the datasheet.

How have you dealt with pins 2 and 4?

vincent_brient · 9th March 2005, 08:31 PM

Quote:

Originally posted by JohnW
Vincent,

Now it appears you have it working, what does it sound like?

John

I listend the TDA1541 in a non-oversampling configuration, the CD drive was a CD723.
The sound is quite good but not has good as CD723 analog output. CD723 cd player uses a TDA1445 with a 4x IIR (not FIR according to datasheet) and a TDA1445.
Then I modified the CD723 to use the TDA1545A in a non oversampling configutation (using a CS8412) and again the sound was not as good.
I will investigate a will reclock the CS8412 using the CD player clock and if it is still not as good as the original CD723 than I will conclude that the 4x oversampling done in the CD723 is really better than the non-oversampling configuration.
I nice idea would be to connect a TDA1541 and other good DAC after the 4x oversampling.

vincent_brient · 9th March 2005, 08:32 PM

Quote:

Originally posted by Fin

They might still be the "Non A" version. I have read that Philips may not have included the internal capacitor between pins 16 and 17 - even though it shows it on the datasheet.

How have you dealt with pins 2 and 4?

Yes pin 2 and 4 are connected.

Fin · 10th March 2005, 12:14 AM

If they are "Non A" - you can separate them.

guido · 10th March 2005, 09:14 PM

Think it's the other way around

Fin · 11th March 2005, 03:19 AM

Hi Guido

I'm referring to the idea of using pin 2 for BCK - and pin 4 for an input directly from the masterclock.

guido · 11th March 2005, 06:23 PM

Yes, i'm mixed up. My bad.

5th March 2005, 12:26 PM	#1
vincent_brient diyAudio Member Join Date: Jan 2005 Location: France	noise problem with TDA1541 I made a no-oversampling DAC using a CS8412 and a TDA1541 (not TDA1541A) chip. The connection between CS8412 and TDA1541 is similar to: http://users.verat.net/~rogic/1541/1...ev1_1b_sch.pdf I used a NE5532 I/V. I works fine for a 0dB 1KHz test tone. Could you confirm that the output signal has a 3.7V offset? For low amplitude signal test I get a very distorded sound, even a -90dB 1KHz test tone make a huge distortion-noise and when I press pause on the CD player the noise totally disappears. Any idea? I have succeded to make a NOS dac using AD1862 and an OS dac using AD1955 and CS8412 and I had no problem. I will also test pcm56, ad1865 and pcm 1852. __________________ Vincent http://vincent.brient.free.fr/main.htm

5th March 2005, 05:09 PM	#2
vincent_brient diyAudio Member Join Date: Jan 2005 Location: France	I found th problem. When I solder a 470p capacitor between pin 16 and 17 the problem disappears so my chips are TDA1541A although I read TDA1541 R1 on top of them. __________________ Vincent http://vincent.brient.free.fr/main.htm

7th March 2005, 10:26 AM	#3
JohnW diyAudio Member Join Date: Jan 2004 Location: Discovery Bay, Prague, Paris...	Vincent, Now it appears you have it working, what does it sound like? John __________________ Life shouldn’t be take it too seriously, you will not come out alive anyway…

10th March 2005, 12:14 AM	#7
Fin diyAudio Member Join Date: Dec 2003 Location: -	If they are "Non A" - you can separate them. __________________ Regards Fin

10th March 2005, 09:14 PM	#8
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	Think it's the other way around __________________ GuidoB


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11th March 2005, 03:19 AM	#9
Fin diyAudio Member Join Date: Dec 2003 Location: -	Hi Guido I'm referring to the idea of using pin 2 for BCK - and pin 4 for an input directly from the masterclock. __________________ Regards Fin

11th March 2005, 06:23 PM	#10
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	Yes, i'm mixed up. My bad. __________________ GuidoB

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