Zen IV
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.
https://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 https://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 https://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.
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.
https://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 https://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 https://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.
Total Comments 2
Comments
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Lots of the information I need is contained in the D1 thread
Here is a post that answered a lot for me.
https://www.diyaudio.com/forums/digit...ml#post2201569
https://www.diyaudio.com/forums/digit...ml#post2191518Posted 22nd September 2010 at 05:39 PM by DougL
Updated 22nd September 2010 at 06:26 PM by DougL -
Posted 22nd September 2010 at 05:44 PM by DougL
