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Old 7th August 2007, 01:41 AM   #1
diyAudio Member
Join Date: Jul 2002
Location: Taiwan
Default Q: Zen-lite with -30~+30 voltage rail?

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.
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File Type: jpg zen-lite circuit -2-var voltage rail.jpg (35.3 KB, 243 views)
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Old 7th August 2007, 03:56 AM   #2
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Nelson Pass's Avatar
Join Date: Mar 2001
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.

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Old 7th August 2007, 11:42 AM   #3
diyAudio Member
Join Date: Jul 2002
Location: Taiwan
I missed the keypoints of a diferential pair and made such a basic mistake.
Thank you very much.

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