Electrical problems.

Discussion in 'Microphones (live or studio)' started by BONGOMAN, Jan 23, 2005.


    BONGOMAN Guest

    Ello peeps... I've also posted this in the design and accoustics thread, wasn't sure where it belonged!

    Can anyone tell me what sort of charge a control room output of a mixer could hold? I've been getting some nasty shocks from the patch bay and I'm pretty sure these are not static, as the charge sticks around for a while and lasts longer than your usual static shock. I was thinking that this could just be the normal charge that goes between mixer and amp stage. The patch leads I have have metal ends, could this be the problem?

    I'm also worried this could be a sympton of a more serious problem. There is quite a hum coming through the speakers, which gets louder and quiter over time. Could it be an earth loop with equipment? Or could it be a problem with the mains supply?
    The shocks come when I unpatch the control room out, which is connected to powered speakers. Earlier, when the patch cord came into contact with another piece of gear, which I presume earthed the charge, it tripped out the fuse box. This is all new gear and I have only just wired this lot together. I have checked that all the earth wires are connected in the IEC plugs.

    I never had these sort of problems in the last studio I was in so I'm quite ignorant to the issues involved.

    Any help or links would be greatly appriciated, cheers.
  2. reginald

    reginald Guest

    You need clean rectification of electricity from ac to dc. The problem is normally caused by transformer overload and wrong capacitor placements making the current to ripple hence cause the noise. DO NOT ATTEMPT TO REPAIR THIS YOURSELF. You need an electrical eng/technician to line up ypur equipment well and advice you on the correct transformers to use. The sittuation also shortens the life of equipment and can destroy your precious equipment at any time. so its a matter of urgency.

    BONGOMAN Guest

    Many thanks, going to get a professional electrician on the case ASAP.
  4. elektro80

    elektro80 Guest

    Ramsgate eh? And you are using grounded plugs etc? The power outlet .. the mains. in the room.. is like grounded? You just also might have live electricity on the ground wire. If so, this is pretty uncool. Keep the lot disconnected until you are sure what is going on.

    BONGOMAN Guest

    Yep sunny Ramsgate lol! Will keep it all unplugged, got an electricain coming tomorrow morning.
  6. anonymous

    anonymous Guests

    Feb 10, 2001

    I have been doing electrical work for over 15 years, and you are doing the right thing by calling a professional.
    It is most likely a ground problem, or lack there of.
    Hope it all works out man!

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