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-   -   Marantz CD-50 and CD-60, TDA1541, CDM4/19 (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a.html)

Mayday 4th December 2011 09:27 PM

I'll probably build an LM317 or LM350 regulator based on the schematics I posted earlier, atleast to begin with. The diodes in the circuit...can I use BYV95A as I have lots of those(I'll go through my boxes again to see what other diodes I might have).
Got the advice to put a Wima(?value) on pin24 of the SAA7220 +5Vdc ->wima(soldered directly on pin24).

When I adjust the voltage, how much can the voltage differ from 5,000Vdc? Of course I'l try to get as close as possible to precisely 5Vdc.

Ordered 6pcs Sanyo Low ESR 1000uF/25V to put under the pcb(2 each in parallell with 2703, 2713 and 2707).

Tomorrow I think the 22.000uF TSUP's arrive and I hope the DIP8 sockets arrive so that I can test my OPA2134 in the cd-60.

Then I'm just waiting for Rubycon 470uF (2704, 2714, 2715 and 2712), Axial 4,7uF/400V MKP's (2673, 2700) and some other bits.

Can I replace the 100uF electrolytes around the opamps to Rubycon 470uF too?

UV101 4th December 2011 09:43 PM

Quote:

Originally Posted by Mayday (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a-post2806313.html#post2806313)
Sounds great, my problem too...can't find schematics(maybe because I'm not sure what to look for).

Plz let me know if you find the schematic :)

Found one!!!! Look in the previous post by Tubee!!! Its a link to a schematic for a reasonable reg using LM317. The LED's are used to set the ADJ voltage and the result is much lower noise than the usual std 317 reg config.

There is always the TPR I suggested. The diagram will be in the LM317 datasheet.

Quote:

Originally Posted by Mayday (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a-post2804894.html#post2804894)
What about 220pF? Any good or useless for this?

Check the advance reclocking document I linked to. Andrew also suggested the info was available here.

Mayday, You seem to be asking lots of questions but not really listening to the answers being given here which is a little frustrating. Most of the questions you have asked in the last 3 pages of posts have been answered in the first 7! Please slow down and read back through the thread. :o:hug:

Get rid of those ceramic caps on the TDA bit decoupling and refit those wima's again on their own and you'll hear what they are doing!!! :eek: ;)

UV101 4th December 2011 09:50 PM

Quote:

Originally Posted by Mayday (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a-post2806650.html#post2806650)
Got the advice to put a Wima(?value) on pin24 of the SAA7220 +5Vdc ->wima(soldered directly on pin24).

You wont get a high enough value film cap as a usable size. I think I suggested 470uF Rubycon ZLG (40p) here but you could try a solid polymer electrolytic (40p). I've previously used 2 x BG std 220uF on 7220 with excellent results but the costs are high. Otherwise you choose, Nichicon MUSE, Elna Silmic or Cerefine.....Caps often are a personal choice which is why I have here and previously suggested caps that are very low cost but extremely effective. :)

Mayday 4th December 2011 09:51 PM

Quote:

Originally Posted by UV101 (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a-post2806678.html#post2806678)
Found one!!!! Look in the previous post by Tubee!!! Its a link to a schematic for a reasonable reg using LM317. The LED's are used to set the ADJ voltage and the result is much lower noise than the usual std 317 reg config.

There is always the TPR I suggested. The diagram will be in the LM317 datasheet.



Check the advance reclocking document I linked to. Andrew also suggested the info was available here.

Mayday, You seem to be asking lots of questions but not really listening to the answers being given here which is a little frustrating. Most of the questions you have asked in the last 3 pages of posts have been answered in the first 7! Please slow down and read back through the thread. :o:hug:

Get rid of those ceramic caps on the TDA bit decoupling and refit those wima's again on their own and you'll hear what they are doing!!! :eek: ;)


You're right. Will do:)

UV101 4th December 2011 09:54 PM

Use those 470uF Rubycons for any analogue rails inc on the opamps and the TDA!! ;)

Use the solid polymer type for all digital rails - 7210, ram, poss 7220, servo etc.

AndrewGM 4th December 2011 11:02 PM

Quote:

Originally Posted by Mayday (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a-post2806650.html#post2806650)
When I adjust the voltage, how much can the voltage differ from 5,000Vdc? Of course I'l try to get as close as possible to precisely 5Vdc

My worry is the 5000vdc
Where on earth is that coming from ?

Anton is right - and is saying again what I said when no one was responding at the start of the thread.
Slow down - your not taking it in and seem in an incredible hurry to do everything at once - you just can't - you'll eventually make a mistake and ruin it

Do it in logical steps and you'll do it better

There really are threads everywhere on this site relating to it all - ' SEARCH ' really works

Are you sleeping ?
You need to do this too !;)

Mayday 5th December 2011 12:41 AM

Quote:

Originally Posted by AndrewGM (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a-post2806762.html#post2806762)
My worry is the 5000vdc
Where on earth is that coming from ?

Anton is right - and is saying again what I said when no one was responding at the start of the thread.
Slow down - your not taking it in and seem in an incredible hurry to do everything at once - you just can't - you'll eventually make a mistake and ruin it

Do it in logical steps and you'll do it better

There really are threads everywhere on this site relating to it all - ' SEARCH ' really works

Are you sleeping ?
You need to do this too !;)

Not 5000, I ment 5Vdc with 3 decimals, how accurate I need to be.

You're right, sorry if I push to hard.

I'm perhaps overly eager to know what I need to know when I get the parts.

I do search, but I doubt myself and my ability to turn theoretical texts into actually applying them in real life. Don't want to go wrong.

I have (don't know the correct word) early retirement due to being to sick to work. So this is what I do when I'm not with the fiance or we are out with the dogs. I DO tend to get a bit manic about stuff, so I appreciate you letting me know when I become to much.

Anyhow, removed SMD's and fitted only wima's.
Took out 2707, and soldered leads in place so I can fit the TSUP tomorrow.

https://i196.photobucket.com/albums/...aps_done_3.jpg
https://i196.photobucket.com/albums/...lingcaps_2.jpg
https://i196.photobucket.com/albums/...ads_TSUP_2.jpg
https://i196.photobucket.com/albums/...ads_TSUP_1.jpg

tubee 5th December 2011 06:11 AM

Have a modded CD880 here, kept OS.

As i said: stunning results (PS to chips, separate IV, kwak clock, reclocking and dem reclock, MSB caps changed, Oscons all around)

Can make a picture of the used shunt schematics

tubee 5th December 2011 06:14 AM

Have a modded CD880 here, kept OS.

As i said: stunning results

(PS to chips, separate IV with own PS from mains, kwak clock, reclocking and dem reclock, MSB caps changed, Oscons all around)

Never had a CDP that good

Can make a picture of the used shunt schematics

UV101 5th December 2011 06:14 AM

Cool, I suspect it was easier fitting those wima's the second time too ;)

The 5v reg doesn't need to be exact. It's the noise on the psu thats important rather than the actiual voltage. Some of my regs run as low as 4.85v. This happens when you use fixed value components due to tolerances. That reg that Tubee linked to on PFM would be worth building as a starter. Only thing I would do is leave out the 10r on the supply.

Make sure you get the polarity right on that big cap! I normally use different coloured wires like red and black in order to avoid confusion. :)


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