Re: 6569 luminances

From: Gerrit Heitsch <>
Date: Tue, 15 May 2012 09:20:48 +0200
Message-ID: <>
On 05/15/2012 04:29 AM, Segher Boessenkool wrote:
> I cannot verify for 6581 (and 6582) right now, but in the 8580 the
> higher voltage supply (+9V there) is used for _all_ the analog
> circuitry, starting with both DACs; not just the output stages.

I stand corrected...

> Curiously, the "middle" voltage for the audio ("analog ground"
> if you will, +4.5V) is generated from +5V, not +9V. I wonder
> why that is.

Maybe because +5V is already very close to what was needed?


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