🚀 go-pugleaf

Aren't we over this discussion, it really isn't one for a pro audio group.
Please stop cross posting.
-- 
Martin Harrington
Lend An Ear Sound
Sydney Australia
0414 913 247
"D" <tarb@bk.ru> wrote in message 
news:1192821296.145466.46540@i13g2000prf.googlegroups.com...
> On Oct 19, 4:40 pm, Bob I <bire...@yahoo.com> wrote:
>> D wrote:
>> > On Oct 19, 1:37 am, Bob I <bire...@yahoo.com> wrote:
>>
>> >>D wrote:
>>
>> >>>On Oct 17, 10:13 pm, Bob I <bire...@yahoo.com> wrote:
>>
>> >>>>The problem is likely caused by the combination of "speakers" being
>> >>>>disconnected by the insertion of the head phones AND the volume knob 
>> >>>>of
>> >>>>the speakers being cranked up rather high. Now the speakers are
>> >>>>amplifying the hum of the little power wart.
>>
>> >>>>D wrote:
>>
>> >>>>>On Oct 17, 1:44 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>>
>> >>>>>>"D"  wrote ...
>>
>> >>>>>>>It does not hum when no headset is plugged in.
>>
>> >>>>>>Then you can eliminate any problem with the computer,
>> >>>>>>the sound card, or any software including drivers, etc.
>>
>> >>>>>>>One of the headsets is brand new and checked.
>>
>> >>>>>>What does "checked" mean?  Do either of the headsets work
>> >>>>>>OK on another computer?
>>
>> >>>>>>>Yes, the hum changes when I move the headset around the room: the
>> >>>>>>>further from the computer case the louder.
>>
>> >>>>>>I would take a wild guess that it has a shielding or grounding 
>> >>>>>>problem.
>>
>> >>>>>>>Yes, it hums when I try using a differen computer mic: both 
>> >>>>>>>headsets.
>>
>> >>>>>>The problem may be with the basic design if both headsets
>> >>>>>>show the same symptoms.
>>
>> >>>>>Thanks Richard Crowley for your suggestions!
>> >>>>>The hum is from speakers, not from the case.
>> >>>>>Yes, either of the headsets work OK on another computer.- Hide 
>> >>>>>quoted text -
>>
>> >>>>- Show quoted text -
>>
>> >>>Thanks Bob I for your explanation!
>> >>>How can the speakers amplify the hum of the little power wart if they
>> >>>are disconnected by the insertion of the head phones?
>> >>>A Sony ECM-T6 microphone and another desk-top microphone don't hum! A
>> >>>new Koss sb/45 headset and Philips SBC HM300 headset hum from their
>> >>>microphones.
>> >>>How to make Koss sb/45 headset microphone work?
>> >>>Best regards,
>> >>>Dima
>>
>> >>The speakers are only disconnected from the audio source, the "wall
>> >>wart" is still powering the speakers amplifier. Try turning the volume
>> >>knob down or unplug the speakers little power supply.
>>
>> >>- Hide quoted text -
>>
>> >>- Show quoted text -- Hide quoted text -
>>
>> >>- Show quoted text -
>>
>> > Thanks Bob I for your explanation!
>> > The speakers are in a headset. There are no other speakers. A "wall
>> > wart" is not powering a headset.
>> > Why does the hum appear from a headset microphone only, not from a
>> > separate microphone?
>> > Best regards,
>> > Dima
>>
>> The confusion comes from the misuse of the term "speaker". The sound
>> producing components in a headset are called "headphones" or "earphones"
>> not "speakers", the condition I described applies to powered speakers
>> not headphones or earphones.- Hide quoted text -
>>
>> - Show quoted text -
> Hello!
> The headsets hum from their microphones even through another sound
> card Creative SB 16, although they do not hum on another computer.
> How to prevent the hum?
> Best regards,
> Dima
>