Best place for the clock is mounting it at the backside left from the SPDIF output. Please use a metal case around it for shielding.
I don't see a possibility in this one for mounting the Tent XO supply. Till now I used a generic supply PCB with a tiny 12 V transformer, a Graetz bridge and some low ESR caps + coils. I designed this PCB for these purposes. I really hate external supplies for various reasons so I can't/won't advise you on that.
BTW the upper power transformer often hums mechanically. It stops humming when you remove the tie wraps. The cable connecting it to the analog board is too long, you can shorten it a few cm at the power pcb side.
I don't see a possibility in this one for mounting the Tent XO supply. Till now I used a generic supply PCB with a tiny 12 V transformer, a Graetz bridge and some low ESR caps + coils. I designed this PCB for these purposes. I really hate external supplies for various reasons so I can't/won't advise you on that.
BTW the upper power transformer often hums mechanically. It stops humming when you remove the tie wraps. The cable connecting it to the analog board is too long, you can shorten it a few cm at the power pcb side.
Thanks Jean-Paul - this helps a lot.
Maybe one of those diecast aluminium boxes - just big enough to hold the XO2 module.
What about another small metal case attached to the outside of the rear panel and back-to-back with the XO2?
Would that be close enough not to be considered an external supply?
Good tip!
Maybe this is why Farguar suggests replacing it with a torroid.
And another good tip!
Any more...............?
jean-paul said:
Maybe one of those diecast aluminium boxes - just big enough to hold the XO2 module.
jean-paul said:
What about another small metal case attached to the outside of the rear panel and back-to-back with the XO2?
Would that be close enough not to be considered an external supply?
jean-paul said:
Good tip!
Maybe this is why Farguar suggests replacing it with a torroid.
jean-paul said:
And another good tip!
Any more...............?
Just do it 
Farguar suggested to replace the transformer but I found it to be quiet when the tie wraps are removed. Nice when you're on a budget but replacing them is better. Problem is that the pinout is non-standard so replacing it for a standard type is unconvenient. Reason that I don't like that transformer is that it hums and that it becomes too warm IMO.
Fitting a toroid is more difficult to fit as the mounting screw comes very close to the mains wires/tracks on the power pcb. Too close if you ask me. I never did this in reality but with the last 70.2 I saw I thought about making a bracket on the pcb for mounting a toroid. I also thought about the toroid having an extra coil for the 12 V for the clock. When I would own a 70.2 I would probably design a new pcb for new power transformers as it can be designed in a very short time. Just some thoughts....
Best tip is probably to make a small pcb with the XO module and a small power pcb as space is tight in this cdplayer.
Carlos Filipe, I'll send you a PM, OK ?
Farguar suggested to replace the transformer but I found it to be quiet when the tie wraps are removed. Nice when you're on a budget but replacing them is better. Problem is that the pinout is non-standard so replacing it for a standard type is unconvenient. Reason that I don't like that transformer is that it hums and that it becomes too warm IMO.
Fitting a toroid is more difficult to fit as the mounting screw comes very close to the mains wires/tracks on the power pcb. Too close if you ask me. I never did this in reality but with the last 70.2 I saw I thought about making a bracket on the pcb for mounting a toroid. I also thought about the toroid having an extra coil for the 12 V for the clock. When I would own a 70.2 I would probably design a new pcb for new power transformers as it can be designed in a very short time. Just some thoughts....
Best tip is probably to make a small pcb with the XO module and a small power pcb as space is tight in this cdplayer.
Carlos Filipe, I'll send you a PM, OK ?
jean-paul said:Just do it
OK - Mr. Nike!
jean-paul said:
Based on all of this - I will change it for one of my PCB mount encapsulated toroids - which is waiting for a nice home.
jean-paul said:
My toroid is 60mm x 60mm x 38mm - so, mounted on a small pcb with stand-offs to raise it clear of the existing transformer pcb might work.
jean-paul said:
Would you retain the existing Digial transformer (the bigger one)?
jean-paul said:
If only I could get a small PCB from someone who has previously made these..........and who might want a SM58..........!!!
The following thread focuses heavily on power supply design with lots of input from KYW. I've asked for some ideas on how to addapt his designs to the Delta - as it could be implimented at the same time as the transformer replacement.
http://www.diyaudio.com/forums/showthread.php?postid=503904#post503904
Not sure whether the discussion should be is that thread or this one??
http://www.diyaudio.com/forums/showthread.php?postid=503904#post503904
Not sure whether the discussion should be is that thread or this one??
jean-paul said:Question is, do I know I have it ?
Which one do you need ?
I need the MN50423FP (processor/digital filter) datasheet.
I googled with "MN50423FP datasheet"
Guess where's the only place I found it:
http://www.diyaudio.com/forums/showthread.php?postid=271829#post271829
Thanks in advance
I have, it's very easy.
The word clock, bit clock and data are terminated by a resistor right by the DAC. I just lifted the ends of the resistors and soldered the min coax onto them and then back to the filter board, so it's easliy reversable for comparison. Do a search for pin info.
Good luck,
Simon
The word clock, bit clock and data are terminated by a resistor right by the DAC. I just lifted the ends of the resistors and soldered the min coax onto them and then back to the filter board, so it's easliy reversable for comparison. Do a search for pin info.
Good luck,
Simon
Ii didn't make any changes to the filtering. Subjectively, the music became slightly more "organic" however I can't honestly say it made a huge difference.
I have another 70.2 with a tube output stage and first order HF filtering which is still oversampling which I feel is superior in almost every respect to the op-amp based one.
I'd like to compare the two more scientifically... so many mods, so little time!
I have another 70.2 with a tube output stage and first order HF filtering which is still oversampling which I feel is superior in almost every respect to the op-amp based one.
I'd like to compare the two more scientifically... so many mods, so little time!
Reclocking
Hi all
In the Delta 70.2 - a 74HC74 dual flip flop is use to reclock BCK going to the DAC, and the SPDIF output.
In the Delta 70.3 - a 74HC175 quad flip flop is used to reclock BCK, WS and DATA going to the DAC, and the SPDIF output.
I wonder if anyone has tried to impliment reclocking of all lines in the Delta 70.2 - as it is done in the 70.3? Maybe someone has an idea for an neat way to do this?
Hi all
In the Delta 70.2 - a 74HC74 dual flip flop is use to reclock BCK going to the DAC, and the SPDIF output.
In the Delta 70.3 - a 74HC175 quad flip flop is used to reclock BCK, WS and DATA going to the DAC, and the SPDIF output.
I wonder if anyone has tried to impliment reclocking of all lines in the Delta 70.2 - as it is done in the 70.3? Maybe someone has an idea for an neat way to do this?
Schematics Arcam Delta 70.2
Hello to all.
They have been very interested from this tribune that I have acquired on Ebay a CD player Arcam delta 70,2.
I kindly ask if someone is disposed to send me the schematics of the Arcam Delta 70,2, I have no problem of space on my email:
giovanni_giovannini@tin.it
Moreover, I would like to know if someone has tried to replace the digital filter SAA7220P/B with the modification MicroClock Master of the "audio NET"
http://www.net-audio.co.uk/microclock.html.
Excuse for my English.
Thanks in order to have read to me.
Giovanni.
Hello to all.
They have been very interested from this tribune that I have acquired on Ebay a CD player Arcam delta 70,2.
I kindly ask if someone is disposed to send me the schematics of the Arcam Delta 70,2, I have no problem of space on my email:
giovanni_giovannini@tin.it
Moreover, I would like to know if someone has tried to replace the digital filter SAA7220P/B with the modification MicroClock Master of the "audio NET"
http://www.net-audio.co.uk/microclock.html.
Excuse for my English.
Thanks in order to have read to me.
Giovanni.
Hi Giovanni
Check your email
The Arcam Delta 70.2 is a little bit different to most other CDP's with SAA7220 - the clock is not generated at this chip. Instead, it is generated using a hex inverted (Z206) on the audioboard. This same inverter package is then used to distribute the clock to the SAA7220 and dual flip-flop (Z207) - which is used to reclock BCK on its way to the DAC (TDA1541A).
What are you trying to achieve - non-oversampling or a clock upgrade?
Check your email
The Arcam Delta 70.2 is a little bit different to most other CDP's with SAA7220 - the clock is not generated at this chip. Instead, it is generated using a hex inverted (Z206) on the audioboard. This same inverter package is then used to distribute the clock to the SAA7220 and dual flip-flop (Z207) - which is used to reclock BCK on its way to the DAC (TDA1541A).
What are you trying to achieve - non-oversampling or a clock upgrade?
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