🚀 go-pugleaf

D wrote:

> On Oct 25, 4:37 pm, Bob I <bire...@yahoo.com> wrote:
> 
>>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.- Hide quoted text -
>>
>>- Show quoted text -
> 
> Thanks Bob I for your suggestion!
> I installed the sound cards to different slots. This did not help.
> Best regards,
> Dima
> 

Then it would seem that the motherboard would be the problem. Is there 
perhaps any "swollen" or leaking capacitors on the motherboard.