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-   -   Q: Zen-lite with -30~+30 voltage rail? (http://www.diyaudio.com/forums/pass-labs/106479-q-zen-lite-30-30-voltage-rail.html)

Peter Huang 7th August 2007 01:41 AM

Q: Zen-lite with -30~+30 voltage rail?
 
2 Attachment(s)
I want to build a Zenlite cooperated with an existed power-supply with -30 and +30 voltage rails. Hence, I modified some points in the original circuit, as shown in the attached drawing.

Is it ok? Thanks.

Nelson Pass 7th August 2007 03:56 AM

Unfortunately, the design depends on very low noise from the
(-) voltage rail. In the original, that rail is ground, so there is
no problem. In your proposed modification, the noise at the
Source of the Mosfet will be amplified.

I suggest that you simply tie the V+ and V- together to form
V+ and ground, with the positive at twice the original value.

:cool:

Peter Huang 7th August 2007 11:42 AM

Ya---Ya---Ya!!!
I missed the keypoints of a diferential pair and made such a basic mistake.
Thank you very much.

Cheers,


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