Modifying the Mission DAD5

[borges]

Hi,

I have an old Mission DAD5 that uses Philips Bitstream conversion. Now I'd like to put my own DA board into it.

How do I modify this player to get to the internal digital signals? Preferably, I'd get in before the S/PDIF generation.

Hope this player has a decent crystal oscillator and power supplies that I can hack into.

Any schematics out there?

Greetings,

Børge

 

[whats gan on]

hi i have one here if i was you i would change all the diodes for 11dq 10 then add a 5 volt super reg and change the opamps you will be very suprised how much better the cd player will sound

 

[rfbrw]

Hi,

I have an old Mission DAD5 that uses Philips Bitstream conversion. Now I'd like to put my own DA board into it.

How do I modify this player to get to the internal digital signals? Preferably, I'd get in before the S/PDIF generation.

Hope this player has a decent crystal oscillator and power supplies that I can hack into.

Any schematics out there?

Greetings,

Børge

A little more info on the chipset.

 

[whats gan on]

a little bit of soap will wash away the lips stick from my face

 

[rfbrw]

a little bit of soap will wash away the lips stick from my face

Your cross dressing issues are no concern of ours.

 

[whats gan on]

it is a song never heard of it george lolhttp://www.showaddywaddy.net/

 

[Gasho]

I think that Beatstream conversion is not a problem in sound of your player.

Poor Clock section, simple and noisy power supply , generic analog section are the problems.

What DAC chipset uses DAD5?

 

[whats gan on]

saa7321 dac saa7310 decoder

 

[Fin]

saa7321 dac saa7310 decoder

Same chips as Philips CD618/624/634/840/850 and similar to Rotel RCD865/965. QED Digit also used that DAC chip.

It is the first generation bitstream with the filter, dac, and analogue stage in one chip. The chip can be used just as a filter and the final internal opamps can be bypassed....but not the ones used for I/V. It has five 5V power pins.

The decoder is fairly common - found in many CDPs of that time. It is easy to access the I2S between the two chips.....but it would be nice to see someone having a real go at making something with 7321 sound better instead of just bypassing it completely.

Jean-Paul likes this chip and thinks it compares well to some of his TDA1541 machines. KWY hates it mainly because you cannot bypass all of the onboard opamps.

 

[whats gan on]

change power supply to the opamps

THE MISSION DAD5
with the opamps replaced with AD826an schottky diodes 11dq10
and pure silver wire bypass the two nikon bp caps creates a lot more life to my player it is so damn musical now with lots more detail. has any one powered the opamps on there own i would love to do that there is a -15 vot reg and a 5v + which i think powers the opamps

 

[Fin]

Re: change power supply to the opamps

THE MISSION DAD5
with the opamps replaced with AD826an schottky diodes 11dq10
and pure silver wire bypass the two nikon bp caps creates a lot more life to my player it is so damn musical now with lots more detail. has any one powered the opamps on there own i would love to do that there is a -15 vot reg and a 5v + which i think powers the opamps

I haven't seen the circuit/schematics of the DAD5....but I would think that the +5V reg powers the DAC chip....and there should be a +15V reg and -15V reg for the opamps.

 

[whats gan on]

hi mate there is only 0ne fixed 7805 and one 7915
thank you for your reply

 

[whats gan on]

silver mica caps

just replaced 2 little surface mount caps with siver mica in the clock of my dad 5 and the sound is fast clean just like what would happen when you fit a trichord clock 4 any one know why they have made a huge improvement

 

[Fin]

Re: silver mica caps

just replaced 2 little surface mount caps with siver mica in the clock of my dad 5 and the sound is fast clean just like what would happen when you fit a trichord clock 4 any one know why they have made a huge improvement

Have you seen this thread?
Silver Micas for Clock in CD40