🚀 go-pugleaf

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.