my own DIY CD PLAYER

[ZERS]

Hi everybody,

I plan to build my own CD player in the coming months and I'm in the way to gather as much information as possible. I've read lot of threads in this forum (as well as others) and unless I did not understand, many points remain dark

Let's sum up what I've already decided :

1- The philips CDPRO2 will be the drive. I bought it last week and I'm still waiting for the delivery

2- the dac will be made of 2 TDA1541a in parallel (I2S input signal from the CDPRO2). This is the dac created by torben kirsten that I find very simple to build. Its output stage is made of tubes.

3- My first issue is the controller. I'm still looking for it, eventhough I have looked into the controller made by BrianGT. But i did not understand how it works. Maybe he could help me ?

4- As regards the PSUs, this is quite more difficult. I do not have sufficient skills to compute how many milli-Ampers are required for the drive and the dac, eventhough I looked carefully at the spreadsheets. Therefore, I could not rate the transformers. Actually, I want to make 3 PSUs : one for the +5V of the dac and the drive, the second will provide the 12V for the drive and the controller and the last one will be dedicated to the output stage (tubes). Each PSU will have is own transformer.

There exists thousand of regulated PSUs, which one to choose ???

5- At least my last concern is the clock. I've read over there several comments about clock and jitter issues. Some of you have changed the crystal provided with the CDPRO2, some of you built an external clock that drive both CDPRO2 and dac.
I must admit that I do not understand the differences between these two possibilities and then, I could not decide what is the best for my CD player and which is the simplest to implement.

Should my english not beeing good, I would apologize. Nevertheless, I hope that my questions are clear..

Thanks in advance for sharing your experiences...

[wazzup]

Hi,

About the controller:

Nico supplies a controller which u can hook up to the cd pro, with easy. That might be an option.

About the psu`s:

I used the schematics from http://www.geocities.com/agalavotti/cdpro.htm Its a pretty straight forward one, and it works fine -for me-

I used 3 transformers, 2 x dual 12 volt, and one 24 volt.
With the 12v`s I made 2x5v psu`s one for the cd pro and one for the controller. Then I made a 9 volt psu for the cd pro motor and I used the 24v one to create the power for the display.

All my toiroids are something like 1 amp max, which would make for 50 Va to be sufficient. And thats quite overdone, as most the psu have to deliver not more than a few miliamps -max 400-

12 volt for the drive is quite a lot, I think. I used 9.8v maybe its possible I don`t know.

Build or buy a clock from Elso or Guido, they will most certainly know what is best. I`m thinking of biulding/buying a clock and put it in the cd pro, reclocking doesnt make scence to me. But its all up to you.

Hope this helps...

[martijn]

Zers,

the dac you have chosen works with three different voltages.
There is only one mentionned in your text.

Martijn

[ZERS]

Originally posted by wazzup
Hi,

About the controller:

Nico supplies a controller which u can hook up to the cd pro, with easy. That might be an option.

I will try to find it and look at it.

Originally posted by wazzup

About the psu`s:

I used the schematics from http://www.geocities.com/agalavotti/cdpro.htm Its a pretty straight forward one, and it works fine -for me-

I used 3 transformers, 2 x dual 12 volt, and one 24 volt.
With the 12v`s I made 2x5v psu`s one for the cd pro and one for the controller. Then I made a 9 volt psu for the cd pro motor and I used the 24v one to create the power for the display.

All my toiroids are something like 1 amp max, which would make for 50 Va to be sufficient. And thats quite overdone, as most the psu have to deliver not more than a few miliamps -max 400-

12 volt for the drive is quite a lot, I think. I used 9.8v maybe its possible I don`t know.

Thanks a lot. I've seen this PSU's, I kept the schematics. That will be maybe the good one !

Originally posted by wazzup

Hope this helps...

Absolutly

Originally posted by martijn
Zers,

the dac you have chosen works with three different voltages.
There is only one mentionned in your text.

Martijn

Martijn,

Looking at the datasheet of the 1541A, the input voltage is +5V. The two others voltages (6V & 235V) are required for the output stage . That's why I precised that I will use a dedicated transformer for this stage, to provide these two voltages.

[martijn]

Zers,

you really need +5V/-5V/-15V to get a TDA1541A working


Martijn

[ZERS]

Originally posted by martijn
Zers,

you really need +5V/-5V/-15V to get a TDA1541A working


Martijn

you're right.
I'm gonna use the PSU's proposed by wazzup

[wazzup]

Plz keep in mind that the psu`s I mentiond are just for the cd pro2 , U`ll need to add the 5, -5, and -15 to get the dac to work.

Let us know how you progress.

[ZERS]

Well,

after wrinting down all the necessary voltages required for both CDPRO2 and the dac :

1- +/- 5V 1A for both CDPRO2 & DAC
2- +9V 1A for CDPRO2
3- +12V for CDPRO2 (flash of the µC). It might be suit for the contrroller
4- +15V 1A for DAC
5- +235 V et 6V AC for the output stage (tubes) of the DAC

With so many voltages, the PSUs are not easy to built, aren't they


That's why I'm looking for the best compromise between dividing the PSU's and decreasing the number of transformers...

[wazzup]

If u are using the psu`s in the schematics I posted ealier, I can send u a order list I made in Exel. It helped me sort out some things.

If u want it let me know.

[ZERS]

Originally posted by wazzup
If u are using the psu`s in the schematics I posted ealier, I can send u a order list I made in Exel. It helped me sort out some things.

If u want it let me know.

I would be very gratefull wazzup. Could you please send this excel sheet by email ?