Support and General Use > Recording

Buzz / Hum recording on H120 - plug in power issue?

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dreamlayers:

--- Quote from: petur on March 04, 2009, 04:22:01 AM ---could it not also be from a bad ground connection somewhere (jack, cable,...) ? I admit I haven't yet listed to the soundfile (I'm at work atm)

--- End quote ---
If I just looked at the sound file I would suspect that.  However, the following part of the first message seems to say that the buzz happens if nothing is plugged in:

--- Quote from: davehouse on March 03, 2009, 02:44:59 AM ---If I monitor the recording screen with no mic at all but Source set to Line In, buzz.

--- End quote ---

davehouse:
yes, the buzz happens if nothing is plugged in. The above recordings were made with no mic plugged in, infact. This is why I thought it might be a plug in power issue as when that power is being 'used' (forgive my lack of technical knowledge) the buzz goes away.

What is strange is that my old H120 had no such issue with any build - the old REP ones or the latest releases. And the new H120 seems fine with iRiver firmware, and even somewhat better using the latest build of Rockbox (although the ringing is still present on recordings).

petur:
If the issue is gone in the iriver firmware, it can't be the plug power. That plug power is always there, it can't be switched off...

davehouse:
dreamlayers was right - it was the backlight fading out causing the buzz! Thanks so much! There's still a tiny 'bump' when the light comes on but its bearable. The ring is still present though, can't seem to get rid of that and think its down to HD activity.

The most annoying thing is my old H120 was silent as a mouse. Even the remote didn't click. How can different units differ so?

dreamlayers:
This may be a hardware problem.  For example, maybe some electrolytic capacitor degraded or failed.

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