Tweaker's Asylum

• Re: Can DAC (TDA1541 or PCM63) be stacked? - Ric Schultz 00:53:13 08/14/01 (5)
  In Reply to: Can DAC (TDA1541 or PCM63) be stacked? posted by PW on August 13, 2001 at 22:55:48:

  Don't know about the 1541 but I think you could. I have stacked PCM 63s and turned on others to do so, including Monarchy Audio. With the PCM 63s it is way better to stack. Going to 2 is the biggest difference. Another 2 and it is a little better. Anotherwords, one (non stacking) is OK, two is mind blowing, four is a touch more so. Accuphase started all this about 8 years ago. They had 16 PCM 63s in parallel per channel (I believe).

  Ric Schultz
  
  

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  • PCM63 stacking - wildmonkeysects 09:39:53 08/14/01 (1)
    In Reply to: Re: Can DAC (TDA1541 or PCM63) be stacked? posted by Ric Schultz on August 14, 2001 at 00:53:13:

    Do you pararllel *all* of the pins, including the ref decouple pins?

    Traditional engineering, um, wisdom, would preclude paralleling lowish impedance voltage outputs, such as the reference decouple pins and the msb potentiometer drive pins.

    But, if it passes the smoke test, and sounds good, that is what matters, not pedantic neurosis, right?

    As usual, power meter is unwinding,

    WMS
    
    

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    • Re: PCM63 stacking - Ric Schultz 11:51:09 08/14/01 (0)
      In Reply to: PCM63 stacking posted by wildmonkeysects on August 14, 2001 at 09:39:53:

      Yes, solder all the pins and let er rip. Remember, that your power supply has to handle twice (or more) the current (shunt regulator users will have to alter the series resistor value and power rating).
      
      However, if you do not have a servoed IV converter or other way to set the offset voltage, you may get some DC offset. If both (or more) DACs error to one direction or the other you can get as much as 2-300mv of offset(either positive or negative). I use an all fet IV converter and I just trim the differential stage for 0 offset.

      Digikey has the PCM-63 in stock.
      You could also try C.C. Poon at Monarchy Audio. I believe he bought thousands of these things and would love to get rid of them.

      Ric Schultz
      
      

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  • Re: Can DAC (TDA1541 or PCM63) be stacked? - PW 03:41:02 08/14/01 (1)
    In Reply to: Re: Can DAC (TDA1541 or PCM63) be stacked? posted by Ric Schultz on August 14, 2001 at 00:53:13:

    Hi Ric,

    thanks for your reply on the AA. Actually, I have a Rotel 991 CD player, it uses PMD100 + two PCM63s, can I jusy buy two additional PCM63s and solder them on top of the current ones? Do I have to change anything? power supply? decoupling caps?

    Many thanks for your help.

    P.S. do you know where can I get some PCM63s? many places don't sell them anymore.
    
    
    

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    • Re: Can DAC (TDA1541 or PCM63) be stacked? - Ric Schultz 11:55:47 08/14/01 (0)
      In Reply to: Re: Can DAC (TDA1541 or PCM63) be stacked? posted by PW on August 14, 2001 at 03:41:02:

      See above post about power suppy, etc. I have stacked as many as four right on top of each other without failure in a very well ventilated chassis. The power supply bypasses can be upgraded, of course, but should work OK without mods.

      Ric
      
      

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  • You meant physically stacked, right? (nt.) - PW 02:55:31 08/14/01 (0)
    In Reply to: Re: Can DAC (TDA1541 or PCM63) be stacked? posted by Ric Schultz on August 14, 2001 at 00:53:13:

    .
    
    

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