I have some tweets in my monitors...

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offnote
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2011/11/22 09:53:51 (permalink)

I have some tweets in my monitors...

Guys,
help me out, I have some birds in my monitor especially active when i close up my USB plug from my VS100 audio interface
to my PC socket, don't have to even plug in completely, but when I do it's still there...come on it's not  spring time for birds grooming in my monitors  any tips how to get rid of them?


p.s.
BTW I'm not a tweeter user...
#1

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    bitflipper
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    Re:I have some tweets in my monitors... 2011/11/22 11:51:56 (permalink)
    Sounds like your monitors aren't well-shielded. Try substituting a shielded USB cable, one that has a braided metal sleeve around it.


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    #2
    offnote
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    Re:I have some tweets in my monitors... 2011/11/22 16:01:53 (permalink)
    will try to buy one, thanks. Disconnecting laptop power supply solves the problem BTW.
    #3
    offnote
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    Re:I have some tweets in my monitors... 2012/01/07 11:53:41 (permalink)
    OK I have tried  shielded USB cable and no change, still same problems.
    I think the only solution is getting UPS and linear power supply for my laptop...  
    #4
    bitflipper
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    Re:I have some tweets in my monitors... 2012/01/07 17:12:03 (permalink)
    UPS's can radiate RFI, too. Buy it retail rather than on line and save your receipt.


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    ampfixer
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    Re:I have some tweets in my monitors... 2012/01/07 22:21:05 (permalink)
    It sounds like you have a problem with the laptop power supply. I've had this issue when building pedal boards. Most guitar tuners have to be on their own wall wart or else noise is put on the audio chain. Isolate the power supply for the one bad box (tuner) and the problem is gone. The same thing may be at work in your case also.

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    Guitarhacker
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    Re:I have some tweets in my monitors... 2012/01/08 09:15:26 (permalink)
    Yeah... it sounds like radiated noise. 

    Dropping back to laptop battery (straight DC power) solves it so it is definitely coming in as radiated noise. 

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    #7
    offnote
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    Re:I have some tweets in my monitors... 2012/01/08 10:06:29 (permalink)
    Guitarhacker


    Yeah... it sounds like radiated noise. 

    Dropping back to laptop battery (straight DC power) solves it so it is definitely coming in as radiated noise. 


    Guitarhacker


    Yeah... it sounds like radiated noise. 

    Dropping back to laptop battery (straight DC power) solves it so it is definitely coming in as radiated noise. 

    since this is a common problem with laptops I am surprised there are no filters available or shielded box solution to buy.
    I have seen filter on audio cables but this reduces the signal band, kinda like muffle.


    #8
    bitflipper
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    Re:I have some tweets in my monitors... 2012/01/08 13:54:29 (permalink)
    All computer power supplies radiate RF noise. They are essentially high-powered oscillators. In a desktop computer, they're enclosed in a grounded cage so you usually don't have a problem unless you place sensitive gear on top or right beside them. But laptop power supplies are cheaply made in plastic enclosures. 

    What you might try is wrapping the power supply - and the entire length of both cables - in aluminum foil and grounding it. That may or may not help, but it's cheap to try.


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    #9
    Jeff Evans
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    Re:I have some tweets in my monitors... 2012/01/08 14:06:54 (permalink)
    Aluminium foil may not work because it might not act as a very good shield. The powersupplies inside a desktop are cased inside a steel enclosure and that is grounded and that is why it works. From what I know any shielding needs to be magnetic. A lot of the little boxes that you can buy for electronic projects are also not steel either they are die cast aluminium so you will have to look around for that.

    You could try and get a nice steel box and ground it and organise it so you put the laptop powersupply inside it. You could cut two semi circular holes at the top that allow you to lay the in and out cables in and the power supply itself inside the steel box and a lid would need to be attached some how as well. All a bit fiddly though but it might work.
    post edited by Jeff Evans - 2012/01/08 14:08:41

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