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Zen IV

Posted 13th September 2010 at 06:05 PM by DougL
Updated 15th September 2010 at 11:37 PM by DougL

Nelson has created a storm of interest with the Zen I/V.

I have a DAC that I can use this with, a K&K RAKK DAC Mk1.

Currently, it has a passive supply and a switchable shunt resistor.

So I am brainstorming on what it would take for an active Zen I/V with a shunt volume control, and both SE and Balanced outputs.

Basics: PCM1794 has differential outputs with 8 ma current output.
http://focus.ti.com/lit/ds/symlink/pcm1794.pdf
So I need 2 Zen I/V per channel.
At present, I am running a DCX2496 Digital crossover, so balanced outputs are a plus.

I am considering using the buffer from this post.
Since bipolar supplies are required for the I/V section, a buffer that does not require additional caps seems prudent.

For the volume control, either http://www.kandkaudio.com/linestage.html Shunt Stepped attenuator or a single LDR replacing the K&K unit.

Finally, for Balanced to SE conversion, a variation on the Broskie cathode follower with jfets seems appropriate.

Idea # 2. SE all the way.
Use 2 I?V modules, but only use 1 output to http://www.diyaudio.com/forums/analo...ml#post2258073.
Volume control, I/V and buffer.

A work about power supplies. Shunt regulators seem to be the way to go here. 100 ma @ 60 volts is 6 watts.
Posted in My Projects
Views 2204 Comments 2
Total Comments 2

Comments

  1. Old Comment
    Lots of the information I need is contained in the D1 thread

    Here is a post that answered a lot for me.

    http://www.diyaudio.com/forums/digit...ml#post2201569

    http://www.diyaudio.com/forums/digit...ml#post2191518
    permalink
    Posted 22nd September 2010 at 06:39 PM by DougL DougL is offline
    Updated 22nd September 2010 at 07:26 PM by DougL
  2. Old Comment
    permalink
    Posted 22nd September 2010 at 06:44 PM by DougL DougL is offline
 
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