Hello
I have those image and the specs sheets. The cxd2500, the tda1541 and the cxd2500 connect to the sm5840.
Gaetan
I have those image and the specs sheets. The cxd2500, the tda1541 and the cxd2500 connect to the sm5840.
Gaetan
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Attachments
Hi Gaetan,
Yes, all you need to do is connect the TDA1541A to the SM5840. Have a look at some of the TDA1541 threads in the Digital section.
The rest you don't need because it's already been done for you.
-Chris
Yes, all you need to do is connect the TDA1541A to the SM5840. Have a look at some of the TDA1541 threads in the Digital section.
The rest you don't need because it's already been done for you.
-Chris
Hello
As usual I did a small search, there is I2S and EIAJ standard, CXD2500 controller do have an EIAJ output. I would need to convert EIAJ to I2S if I want to use the TDA1541. So it seem that I can't use the TDA1541 in non-oversampling with a CXD2500, since the SM5840 are an oversampling chip.
Gaetan
As usual I did a small search, there is I2S and EIAJ standard, CXD2500 controller do have an EIAJ output. I would need to convert EIAJ to I2S if I want to use the TDA1541. So it seem that I can't use the TDA1541 in non-oversampling with a CXD2500, since the SM5840 are an oversampling chip.
Gaetan
Hi Gaetan,
Of course you could try to take your signal out before the digital filter, the CXD2500 and process it that way.
This bit about non-oversampling is silly. It forces you into analog brick wall filters and they are no fun. You should see many early filters. You see L-C compound filters (tuned) and potted precision filer "jungle chips". Then you are stuck with whatever op amp they used because you can't get to it. Build your own? Nah. Not a chance.
1 bit, now that I don't like the sound of either.
-Chris
Yes they are, and no I don't. Try to dig up a non-working CD player that uses those chips that you want. That's what I would do.
I don't understand why not. Some of the newer filters are much better than the old ones. The TDA1541 will accept data at a pretty fast rate I think. You do not want to use those old 7 th order analog filters. Believe me - you don't. You really do not want to send the audio into anything without filtering it either. Many reasons for this.
Yes, it's a good one.
Of course you could try to take your signal out before the digital filter, the CXD2500 and process it that way.
This bit about non-oversampling is silly. It forces you into analog brick wall filters and they are no fun. You should see many early filters. You see L-C compound filters (tuned) and potted precision filer "jungle chips". Then you are stuck with whatever op amp they used because you can't get to it. Build your own? Nah. Not a chance.
1 bit, now that I don't like the sound of either.
-Chris
Hello
Maby the SM5840 could be good since they said that there is no group delay, so it should be linear in phase ?
If I remember correct, the TDA1541 are better sounding than the PCM61, I think so ??
There is so much talk about the better sounding of non-oversampling dac, it's hard to know what really going on.
Gaetan
Maby the SM5840 could be good since they said that there is no group delay, so it should be linear in phase ?
If I remember correct, the TDA1541 are better sounding than the PCM61, I think so ??
There is so much talk about the better sounding of non-oversampling dac, it's hard to know what really going on.
Gaetan
Attachments
NJM4558D
Gaetan
The TDA154 as implemented in the earlier Philip/Marantz CD players can sound very good indeed when oversampled, and the multibit ladder capacitors replaced by quality units. Then you need to null the DC current of around 1.8mA going into the next stage so that you don't have DC out at half rail voltage, then better opamps etc. The list goes on and on. I went through all this years ago with an old Marantz CD65. Believe me, you really don't want to go there !Then of course is the sad fact that virtually all the remaining TDA1541s are second rate. They were graded into different grades. The very best ones can fetch much more than $1,000 , if anyone is willing to part with them (Golden Dragon, or something like that)
Chris has given some very good advice in his previous posting. Especially, the VERY BOTTOM line.
SandyK
Gaetan
The TDA154 as implemented in the earlier Philip/Marantz CD players can sound very good indeed when oversampled, and the multibit ladder capacitors replaced by quality units. Then you need to null the DC current of around 1.8mA going into the next stage so that you don't have DC out at half rail voltage, then better opamps etc. The list goes on and on. I went through all this years ago with an old Marantz CD65. Believe me, you really don't want to go there !Then of course is the sad fact that virtually all the remaining TDA1541s are second rate. They were graded into different grades. The very best ones can fetch much more than $1,000 , if anyone is willing to part with them (Golden Dragon, or something like that)
Chris has given some very good advice in his previous posting. Especially, the VERY BOTTOM line.
SandyK
Re: NJM4558D
Hello
Have you compared the TDA1541 vs the PCM61 ?
I allready have some new 10 years old TDA1541 , I did have them directly from Phillips Canada.
Gaetan
sandyK said:
Hello
Have you compared the TDA1541 vs the PCM61 ?
I allready have some new 10 years old TDA1541 , I did have them directly from Phillips Canada.
Gaetan
NJM4558D
Gaetan
No, I haven't compared them. Perhaps you could be better off wiring for SPDIF and feeding into a good DAC, either purchased, or from one of the Diy kits. I have no expertise in the Diy kit area.
I fear that you may be getting well out of your depth with these
ambitious plans.
SandyK
Gaetan
No, I haven't compared them. Perhaps you could be better off wiring for SPDIF and feeding into a good DAC, either purchased, or from one of the Diy kits. I have no expertise in the Diy kit area.
I fear that you may be getting well out of your depth with these
ambitious plans.
SandyK
OPA2604 Dual
I agree with Colin, the Burr Brown OPA2604 (Dual) will simply fit in place without oscilation problem. Removing the 2(two) SMD type muting transistors also will add clarity however will create click noise when powering on and off - to cure this noise switched off the Power Amp before switch off the CD and switch on the CD first before the Power Amp. Also replace the out put capacitor C429 and C438 with Tantalum (cheaper) or Black Gate NX series (expensive).
I agree with Colin, the Burr Brown OPA2604 (Dual) will simply fit in place without oscilation problem. Removing the 2(two) SMD type muting transistors also will add clarity however will create click noise when powering on and off - to cure this noise switched off the Power Amp before switch off the CD and switch on the CD first before the Power Amp. Also replace the out put capacitor C429 and C438 with Tantalum (cheaper) or Black Gate NX series (expensive).
Hi Gaetan,
As Sandy said ...
Personally I much prefer the BB PCM1702 DA converter. For what it's worth, I feel you lose too much when using an external DAC via toslink or RCA. So if you can find a way to tie the new converter in, then do it that way. I've been wanting to do some of this, but I haven't yet. I don't know enough to do a good job.
-Chris
As Sandy said ...
I tend to agree with him. Before leaping off with this, you may really benefit from doing some reading in the digital section. Try to avoid the FAD stuff.
Personally I much prefer the BB PCM1702 DA converter. For what it's worth, I feel you lose too much when using an external DAC via toslink or RCA. So if you can find a way to tie the new converter in, then do it that way. I've been wanting to do some of this, but I haven't yet. I don't know enough to do a good job.
-Chris
anatech said:
Hello
BB PCM1702 DA converter ?
I presume it is not pin compatible with my BB PCM61 DA converter ?
Is the BB PCM1702 are as good than the BB PCM63 DA converter ?
Gaetan
Hi Gaetan,
-Chris
Yes.
No, it's a larger package. Your DA is the better of it's pin compatible earlier design, the PCM56.
I think so, but everyone has an opinion.
-Chris
Hello
I did just found a CS8464 at a surplus store.
I did look in my old box of parts and I have also some TDA1541, AD1851. AD1865, AD1866, AD1892, DIR1701, AD825, and OPA627, that box was far under others box in the basement, I did buy them years ago but was not experiment enough to use them.
I've just received sample of THS4032
So one day I may do a nice DAC
Gaetan
I did just found a CS8464 at a surplus store.
I did look in my old box of parts and I have also some TDA1541, AD1851. AD1865, AD1866, AD1892, DIR1701, AD825, and OPA627, that box was far under others box in the basement, I did buy them years ago but was not experiment enough to use them.
I've just received sample of THS4032
So one day I may do a nice DAC
Gaetan
Hello
After finishing the last modifications on my Denon DCM-420 cd player (adding 400 uf cap on the rails, very close to the Dac PCM61 chips), I did some tests.
To test the jitter, I did found a 16bit/44.1kHz JTEST signal wave file. Made of a 11025Hz square wave with 229.6875Hz LSB.
So I did burn a cd with that signal and use it with my Denon DCM-420 cd player, and I use my sound card and a FFT software, the result seem good since my Denon have a jitter at -90 db in relation with the 0 db 11025Hz signal.
For the distortion at very low level I did burn a cd with a -60 db sine wave made with Cool Edit 96, and using again my sound card and a FFT software, I did reajust the MSB of the PCM61, and it give a -47 db distortions at that very low level sine.
For the PCM61, the I/V op amp are inside the PCM61, that integrated op amp have 12 volt us slew rate, we can diconnect the op amp but I don't know if it's worth it to use an external I/V op amp ?
Gaetan
After finishing the last modifications on my Denon DCM-420 cd player (adding 400 uf cap on the rails, very close to the Dac PCM61 chips), I did some tests.
To test the jitter, I did found a 16bit/44.1kHz JTEST signal wave file. Made of a 11025Hz square wave with 229.6875Hz LSB.
So I did burn a cd with that signal and use it with my Denon DCM-420 cd player, and I use my sound card and a FFT software, the result seem good since my Denon have a jitter at -90 db in relation with the 0 db 11025Hz signal.
For the distortion at very low level I did burn a cd with a -60 db sine wave made with Cool Edit 96, and using again my sound card and a FFT software, I did reajust the MSB of the PCM61, and it give a -47 db distortions at that very low level sine.
For the PCM61, the I/V op amp are inside the PCM61, that integrated op amp have 12 volt us slew rate, we can diconnect the op amp but I don't know if it's worth it to use an external I/V op amp ?
Gaetan
Geatan8888 , where did you find the jitter test signal ?
Can you give me a url or email a copy to me at ashokm(at)sify(dot)com .
Thanks.
Can you give me a url or email a copy to me at ashokm(at)sify(dot)com .
Thanks.
Hello
Here it is, it's a zip file;
http://www.diyaudio.com/forums/attachment.php?s=&postid=875279&stamp=1143041760
Gaetan
Here it is, it's a zip file;
http://www.diyaudio.com/forums/attachment.php?s=&postid=875279&stamp=1143041760
Gaetan
hey I am in need for a circuit diagram to use jrc 4558d ic for the purpose of using it as a stereo headphone amplifier.please share it with me if any one know about it
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