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noise whilst recording using mains power

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Nimai

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i recently used my nh900 to record a long recording. I had it connected to the mains for the whole period. when i heard my recordings i heard a buzzing sound in the background. Should this happen? If not then is it a fault of my player?

Otherwise what would you reccomend i should do to increase battery life whilst recording? would the batteries from the MZN1 net MD work on a nh900? all suggestions would be appreciated.

thanks

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I have noticed that with my NH700, regardless of how clean the power source is or whether the chokes are installed or not, trying to record with a powered mic while using the AC adapter is an exercise is utter futility.

HUMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM.

On the other hand, with a no-name AA battery and a HiMD disc I have successfully made recordings in excess of 7 hours in length [with a powered mic, in Hi-SP mode] and still had enough juice to use the unit as a player for a couple of days [of heavy use] afterwards.

PCM mode would be another matter, though.

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I have had the same buzzing on the MZ-NH1 when using mains while recording from a mic - with suppressors on.

I have found that 5 NiMH rechargable AA size in a battery pack (5 because they are 1.2 v and the 4.8v from 4 gave erratic service) plugged into the charging station worked very well - Maplin (maplin.co.uk) in the UK sells battery holders for 6 and dummy batteries to take up the sixth position and the power supply plug etc.

With 2300mAh AA cells available there is a lot of juice for hours of buzz free-recording...

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Sony's video cameras and other devices with "plug in power" for mics are also very well-known for this "feature". [i've also experienced this with Canon miniDV equipment. It appears that power filtration isn't a concern for equipment manufacturers.]

It should only happen with powered mics though.

I've met budget video crews who carry around their own power along with their equipment - marine or motorcycle lead-acid batteries in cases, and a 12V recharger, because getting good AC at any given location is iffy for one - secondly because of problems with powering condensor mics.

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