Bug 11294 – Unwanted Noise from headphone jack

Bug 11294 - Unwanted Noise from headphone jack

Summary:

Unwanted Noise from headphone jack

Status:	RESOLVED FIXED

Product:	SB Touch
Classification:	Unclassified
Component:	Product Quality
Version:	unspecified
Platform:	PC Other

Importance:	-- normal (vote)
Target Milestone:	MP
Assigned To:	Maurice Alou

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2009-03-09 11:23 UTC by Dan Evans
Modified:	2009-09-08 09:13 UTC (History)
CC List:	0 users

See Also:
Category:	---

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Description Dan Evans 2009-03-09 11:23:41 UTC

With a set of speakers plugged into the headphone jack (or with actual headphones) you can hear quite a bit of noise.  At least that is true with my PB2 unit.

Comment 1 Blackketter Dean 2009-03-09 11:42:30 UTC

Hm, this isn't good.  Can you show this to Maurice?

Comment 2 Dan Evans 2009-03-09 12:02:51 UTC

I have demo'd this for Maurice.  He has my PB2 now.

Comment 3 Maurice Alou 2009-03-09 15:26:50 UTC

Here are some observations:
- noise only on right channel and only on headphone;
- the noise is sporadic

The noise dissapears when the AC coupling capacitor C101 (ceramic 1uF, logitech p/n 111645-A105) is removed.
Replacing the capacitor with a new one solved the problem...

Comment 4 Maurice Alou 2009-03-09 15:27:55 UTC

BTW, the MAC address of the unit ends in 22:01:A4