Hi Andy,
One "last" (I can't promise 🙂 ) thing: in the PSU, C2452 was a 1500µF35V cap. The tension indicated on the shematics is 18.6 V. I wish to order some new caps, but the closest they have is 2200µF 25V. Theoretically the input voltage should be ok, but do you think the 25V characteristics will be strong enough for that purpose?
Henri
One "last" (I can't promise 🙂 ) thing: in the PSU, C2452 was a 1500µF35V cap. The tension indicated on the shematics is 18.6 V. I wish to order some new caps, but the closest they have is 2200µF 25V. Theoretically the input voltage should be ok, but do you think the 25V characteristics will be strong enough for that purpose?
Henri
nebula schematic
hey munchingmalc - did you see my post about the Linx Nebula Schematic? I've been trying to contact you but this forum won't let me because I'm a new member...or something...
Anyway, let me know if you think I can help.
Cheers.
hey munchingmalc - did you see my post about the Linx Nebula Schematic? I've been trying to contact you but this forum won't let me because I'm a new member...or something...
Anyway, let me know if you think I can help.
Cheers.
CD104 mod with 2 TDA1541a's
I modified my 3rd CD104 with NOS and 2 TDA1541A's
This time the decoupler caps etc are on the upper side of the
PCB. see attached photo.
(MSB=1mf)
On the saa7000 every decoupler cap (0,022mf) is parallelled with a 0,1 mf mkt cap
The data and clock lines go directly from the SAA7000
to the TDA1541A's with thick copper wires ( Including the groudline, I cut the lines on the PCB.)
In a former post I mentioned that I have replaced the output caps
with tantaliums. That was a big mistake !!
Now there are two 3.3 mf (MKT) parallel, and that differs a lot !!
(6.8 mf MKT were not available)
Again I compared this mod with a NOS mod and 2 tda 1540P.
And the difference is clear. The 2 TDA1541A sound nicer !
Is there actually somebody who has done this mod too ???
Regards to all
Onno
I modified my 3rd CD104 with NOS and 2 TDA1541A's
This time the decoupler caps etc are on the upper side of the
PCB. see attached photo.
(MSB=1mf)
On the saa7000 every decoupler cap (0,022mf) is parallelled with a 0,1 mf mkt cap
The data and clock lines go directly from the SAA7000
to the TDA1541A's with thick copper wires ( Including the groudline, I cut the lines on the PCB.)
In a former post I mentioned that I have replaced the output caps
with tantaliums. That was a big mistake !!
Now there are two 3.3 mf (MKT) parallel, and that differs a lot !!
(6.8 mf MKT were not available)
Again I compared this mod with a NOS mod and 2 tda 1540P.
And the difference is clear. The 2 TDA1541A sound nicer !
Is there actually somebody who has done this mod too ???
Regards to all
Onno
Attachments
hi
onnosr
i want to use TDA1540D(i love its sound) with SAA7210.is that possible?
and how to do it?
thanks...
robo
onnosr
i want to use TDA1540D(i love its sound) with SAA7210.is that possible?
and how to do it?
thanks...
robo
Re: hi
The SAA7210 is 16 bit and outputs only I2S. (serial data)
The TDA1540d is 14 bit and takes only parallel data. (L or R)
So IMHO it is not possible.
PS I emailed the datasheet of the SAA7210 to you.
Regards,
Onno
robo said:
The SAA7210 is 16 bit and outputs only I2S. (serial data)
The TDA1540d is 14 bit and takes only parallel data. (L or R)
So IMHO it is not possible.
PS I emailed the datasheet of the SAA7210 to you.
Regards,
Onno
oh
pity....
thank you all the same.
i love TDA1540D more than TDA154AS1.maybe i have to use SAA7000/7010/7020/7030 to drvie it....
robo..
pity....
thank you all the same.
i love TDA1540D more than TDA154AS1.maybe i have to use SAA7000/7010/7020/7030 to drvie it....
robo..
Re: hi
It is possible so long as you understand you will loose two bits. A good place to start would Analog Devices application note AN-207.
This shows how to connect the SAA7220 to a pair of mono dacs. The circuit will then have to be modified to suit the SAA7210.
robo said:
It is possible so long as you understand you will loose two bits. A good place to start would Analog Devices application note AN-207.
This shows how to connect the SAA7220 to a pair of mono dacs. The circuit will then have to be modified to suit the SAA7210.
yeth
thanks for your reply.
i just want to use TDA1540D as easy as possible,and also as well as possible.
of course i can use it in those CDP just like CD104 or CD25 of marantz.but i want to disign a new PCB for CDM3 laser,which uses TDA5708/TDA5709 as its SER,it has been done.and also uses SAA7210/MAB8441,it is in my plan,easy things.
the only problem is:how to use TDA1540D in my new disign?i think the main thing is how to cnonnet SAA7030 to SAA7210.
anybody can help?please
robo
thanks for your reply.
i just want to use TDA1540D as easy as possible,and also as well as possible.
of course i can use it in those CDP just like CD104 or CD25 of marantz.but i want to disign a new PCB for CDM3 laser,which uses TDA5708/TDA5709 as its SER,it has been done.and also uses SAA7210/MAB8441,it is in my plan,easy things.
the only problem is:how to use TDA1540D in my new disign?i think the main thing is how to cnonnet SAA7030 to SAA7210.
anybody can help?please
robo
Hi guys.
I just love this thread.
The TDA 1540 which is used in the earliest machines, seems to gather some attention.
Allthough it doesn't measure very well, for instance it reveals quite a lot of harmonic distortion, some like the sound of it despite of measurements.
Count me in, because i like the sound from it as well 😀
Now.
I have this odd idea.
In one of the other threads, building the ultimate DAC using coupled TDA 1541A's looks very interesting.
Modifying the internal parts of TDA 1540 machines is also very interesting.
Instead of modifying, why not taking all the internal parts out of TDA 1540 machines and replacing them with new ones, constructed from scratch ?
If we're keeping the CDM0/CDM1 and the powersupply, it must be possible to build new electronics around a set of TDA 1540.
The idea of taking the old boards out is because, that it later can be put back, in order to remain its originallity.
Constructing new electronics. Would that really be that impossible ?
With software anno 2006/2007, PCBs could be made more compact.
I'm not into the fundamentals of digital construction and perhaps my ignorance undermines my realistic approach, but could it be possible to connect a number of TDA 1540s in order to reach true 16 bit handling ?
Maybe I'm just a braindead head with a lot of braindead idea, so bear with me please 😱
Kindest regards
Brian Hougaard Baldersbæk
I just love this thread.
The TDA 1540 which is used in the earliest machines, seems to gather some attention.
Allthough it doesn't measure very well, for instance it reveals quite a lot of harmonic distortion, some like the sound of it despite of measurements.
Count me in, because i like the sound from it as well 😀
Now.
I have this odd idea.
In one of the other threads, building the ultimate DAC using coupled TDA 1541A's looks very interesting.
Modifying the internal parts of TDA 1540 machines is also very interesting.
Instead of modifying, why not taking all the internal parts out of TDA 1540 machines and replacing them with new ones, constructed from scratch ?
If we're keeping the CDM0/CDM1 and the powersupply, it must be possible to build new electronics around a set of TDA 1540.
The idea of taking the old boards out is because, that it later can be put back, in order to remain its originallity.
Constructing new electronics. Would that really be that impossible ?
With software anno 2006/2007, PCBs could be made more compact.
I'm not into the fundamentals of digital construction and perhaps my ignorance undermines my realistic approach, but could it be possible to connect a number of TDA 1540s in order to reach true 16 bit handling ?
Maybe I'm just a braindead head with a lot of braindead idea, so bear with me please 😱
Kindest regards
Brian Hougaard Baldersbæk
haha
it looks we have words....do you have any way to use TDA1540s?
😀
robo regard.
DK6400Brian said:
it looks we have words....do you have any way to use TDA1540s?
😀
robo regard.
Re: Re: yeth
well...
maybe i cannot take what you mean..sorry..
i know that SAA7030 receives 16BIT data and changes it into 14BIT for TDA1540,just like conneting with SAA7000.but as i know,SAA7000 is dirferent from SAA7210.if i can connet TDA1540 with SAA7210,that will be quit simple for me to do it than conneting to SAA7000 while i want to design a piece of PCB.
so,what is you suggestion?about TDA1540--SAA7030--SAA7210.
thanks
robo
rfbrw said:
well...
maybe i cannot take what you mean..sorry..
i know that SAA7030 receives 16BIT data and changes it into 14BIT for TDA1540,just like conneting with SAA7000.but as i know,SAA7000 is dirferent from SAA7210.if i can connet TDA1540 with SAA7210,that will be quit simple for me to do it than conneting to SAA7000 while i want to design a piece of PCB.
so,what is you suggestion?about TDA1540--SAA7030--SAA7210.
thanks
robo
hey,
i just got given an old gray/silver philips cd104 but there is a problem with it, it will play the first three tracks but that is all, it only recognises the first three tracks..
Could this be a problem with the throughholes or mabey i need to clean the mechanism that moves the laser? or is it more likley to be something completely different?
any chance someone could send me the schematics for it aswell?
Cheers,
Owen
i just got given an old gray/silver philips cd104 but there is a problem with it, it will play the first three tracks but that is all, it only recognises the first three tracks..
Could this be a problem with the throughholes or mabey i need to clean the mechanism that moves the laser? or is it more likley to be something completely different?
any chance someone could send me the schematics for it aswell?
Cheers,
Owen
DoomPixie said:
It could be the through-hole links (griplets). It is always good practice to desolder them and redo with a wire link ( search this thread for griplet )
Does the swing-arm mechanism travel all the way back and forth freely ?
Does the cd player display the correct track information eg 10 tracks for a 10-track cd ?
Cleaning the lens carefully will do no harm.
Andy
I'm at my g/f's at the moment and dont have any tools here but as soon as i get it home i'll rip it open and check if the mechanism is moveing freely and atack the griplets with a dremmel.. I did run a cleaning cd through it and that didnt help but since i dont have any tools here i havent had a chance to open it and clean the lense properly yet. It does rcognise the cd's properly and recognises all the tracks are there but just refuses to play anything past track 3 on most cd's.. tried with a cd that has abnormally long tracks and it only played the first two tracks and a bit of the third.. so it seems more like it is haveing problems reading past a certain point on the cd. lets for arguments sake say it will play the first 9 mins of a cd. apart from that it works very well. bit of a crackle if you move the signal wires around but i'm going to rip them off and replace with some decent rca sockets anyway.
cheers,
Owen
cheers,
Owen
forgot to mention i have read this entire thread, been following it as i plan to mod mine, only just got it in my hands though, my g/f's dad's old cd player, it went wrogn and he went and bought a new one and asked if i wanted the old philips and i was like.. "hell yes" but only just got hold of it and dont have any tools till i get home so in a couple of days i should be able to find out more.. unless i have some spare time and head of into town to buy some tools :/
Owen
Owen