Improving my old Marantz CD40?????

[riccardo]

Originally posted by jean-paul
Good point, your doubt is justified. Replace the electrolytics after the regs for standard BCComponents series 037/038 or similar. No low ESR types here, certainly not OSCONs.

Ok, jean Paul, many Thanks.
The last question: BEFORE? after the transformer?
Could you suggest a type and value?
Thanks
Riccardo

[jean-paul]

At the input of the regulators ( = after the transformer + diode bridge ) please use low ESR types like Panasonic FC and after the regulators ( i.e. at the output of the regulators ) standard BCComponents or similar. I can not express it any clearer.

You can use low ESR types ( Panasonic FC/OSCON ) for decoupling the SAA and other digital chips of course. Just do not use them directly in the proximity of the regulators outputs.

[riccardo]

Originally posted by jean-paul
At the input of the regulators ( = after the transformer + diode bridge ) please use low ESR types like Panasonic FC and after the regulators ( i.e. at the output of the regulators ) standard BCComponents or similar. I can not express it any clearer.

You can use low ESR types ( Panasonic FC/OSCON ) for decoupling the SAA and other digital chips of course. Just do not use them directly in the proximity of the regulators outputs.

Ok, thanks, very clear.
Curiosity kill the cat....i have now another question:
do you think could be right change the value (more capacitance) for the new cap?
In the 2 situation , after trasformer, and at the regulators output?
For example, at the regulator output the standard value are:
47uF, 25V and 33uF 16 V.
I could, in Your opinion, increase the value until 100uF? or greater? or this choice could be absolutely wrong, and leave too much emphasys to low frequencyes, or lower speed of the sound?
Thanks again
Riccardo

[riccardo]

Originally posted by jean-paul
At the input of the regulators ( = after the transformer + diode bridge ) please use low ESR types like Panasonic FC and after the regulators ( i.e. at the output of the regulators ) standard BCComponents or similar. I can not express it any clearer.

You can use low ESR types ( Panasonic FC/OSCON ) for decoupling the SAA and other digital chips of course. Just do not use them directly in the proximity of the regulators outputs.

Better.
First of all thanks, Jean Paul.
I'll try and effctively sanyo os con after the regulator produces a reduction in high frequencies. Better 037.
But know i have another question, please:
about decoupling SAA and other IC.
What do you think could be the cap's correct value?
The same of the original bypass, wich are 33uF and 47mF and 330uF, with BCC037, or try a 220uF with OS CON?
The cdp is a marantz cd40...
Many Thanks.
Riccardo

[jean-paul]

Originally posted by riccardo
I'll try and effectively sanyo os con after the regulator produces a reduction in high frequencies. Better 037.

No OSCON or low ESR caps after regular 78xx/79xx regulators. Please reread this thread. Do a Search on this forum. Check some other threads.

Originally posted by riccardo
What do you think could be the cap's correct value?
The same of the original bypass, which are 33uF and 47mF and 330uF, with BCC037, or try a 220uF with OS CON?

I can't read the schematic you attached but I would stick to 47 uF standard quality directly after ( = at the output ) all regulators. No more no less. It can not hurt to use slightly bigger electrolytics before the regs, i.e. the ones that filter the ripple.

[tvicol]

Please, can someone help me with schematic for Marantz CD-40 ?

tiberiu_vicol(at)yahoo.com
replace (at) with @

tibi

[mgm31]

Originally posted by tvicol
Please, can someone help me with schematic for Marantz CD-40 ?

tiberiu_vicol(at)yahoo.com
replace (at) with @

tibi

You can find service manual for a bit buck on E-Bay :

Example : http://cgi.ebay.fr/Marantz-Service-M...QQcmdZViewItem

[acccruz]

Originally Posted by riccardo

Ciao Ashley

the pcb directly from...Elso kwack, obviously.
Kwack clock 7.
The 40 it's the "pole" of my stereo.
My "old" marantz cd 40 it's like a Ferrari's car.
I put inside the cdp a transformer's output By Royal Device, (could you see on web) and now the new clock.It sound superb!
(i did buy the service manual on ebay, do you remember?)
ciao kind regards,
Riccardo

Hi Riccardo:

Please let me know where you bought the transformer's output Royal Device, and how do you have connect it to DAC.

I want to try it instead of any Op Amps.

Many thanks for your help,
Antonio