🚀 go-pugleaf

D wrote:

> On Oct 24, 11:01 pm, Bob I <bire...@yahoo.com> wrote:
> 
>>D wrote:
>>
>>>On Oct 24, 5:13 pm, Bob I <bire...@yahoo.com> wrote:
>>
>>>>D wrote:
>>
>>>>>On Oct 24, 1:04 am, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
>>
>>>>>>"D"  wrote ...
>>
>>>>>>>Microphones with a battery do not hum. Why?
>>
>>>>>>Because the battery is independent of the mains power.
>>
>>>>>>That confirms that the problem is coming from the mains-
>>>>>>derived microphone power coming through the sound card.
>>
>>>>>>>How to make microphones without a battery not hum?
>>
>>>>>>Replace the sound card with one that works properly.
>>>>>>(Or just continue to use the battery.)
>>
>>>>>Thanks Richard Crowley for your answers!
>>>>>I have two cards: SB Live ct4830 and SB 16 PnP. They both hum from a
>>>>>headset microphone.
>>>>>Best regards,
>>>>>Dima
>>
>>>>I suspect that it isn't the Microphone that is humming but that a HUM is
>>>>heard in the headphones WHEN the microphone is plugged in? If that is
>>>>the case then perhaps the problem is the filter capacitors on the
>>>>motherboard or powersupply are the problem?- Hide quoted text -
>>
>>>>- Show quoted text -
>>
>>>Thanks Bob I for your opinion!
>>>A HUM is heard in the headphones WHEN the microphone is plugged in and
>>>not muted. The hum is not heard when the microphone is muted.
>>>How to know which filter capacitors are the problem: on the
>>>motherboard or powersupply?
>>>Best regards,
>>>Dima
>>
>>That would be a hardware issue, the powersupply would be the easiest to
>>swap out. You've proved the soundcards don't make a difference.- Hide quoted text -
>>
>>- Show quoted text -
> 
> Thanks Bob I for your suggestion!
> Could a mainboard BIOS setting be the problem? The same hum was with
> an old power supply. The hum increases if I increase the microphone
> volume.
> Best regards,
> Dima
> 

I would doubt that a BIOS setting would have an effect on this. Since 
the hum is being picked up in the microphone circuitry and being 
amplified, increasing the mike volume increases the sounds. You might 
try moving the sound card to a different motherboard slot to see if 
there is any reduction in the hum by moving it further away from some 
component.