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Power output #3

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sp5wwp opened this issue Oct 12, 2020 · 5 comments
Open

Power output #3

sp5wwp opened this issue Oct 12, 2020 · 5 comments
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bug Something isn't working mainboard This issue affects the mainboard

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sp5wwp commented Oct 12, 2020 •
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  1. Power output is limited to 0.75W. At that power, the bias voltage is 2.9V.
  2. There's a high pitched sound audible when PA is active.

ALC circuitry works.
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sp5wwp commented Oct 12, 2020

Squeak was eliminated by adding a 10k resistor in parallel to C106.

@sp5wwp sp5wwp self-assigned this Oct 12, 2020
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sp5wwp commented Nov 12, 2020

Maybe we should get rid of Q3 (BGA6589).

@tkuester tkuester added bug Something isn't working mainboard This issue affects the mainboard labels Nov 12, 2020
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Is this related to issue #8/9 in the errata, about R64 and C106?

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sp5wwp commented Nov 12, 2020

@tkuester yes, it is.

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sp5wwp commented Nov 14, 2020 •
edited

The RF lowpass stage (around L9, L10) has to be redesigned.

My proposal:
obraz

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