Need Help with HV system

Discussion in 'General Electronics Chat' started by n_uhnak, Mar 11, 2010.

  1. n_uhnak

    Thread Starter New Member

    Mar 11, 2010
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    0
    I am working on the development of a High voltage chemical sensor, and I have run into a little hiccup.

    I was looking for some common things that would blow a resistor, and if a relay switch could be stuck on a setting.

    Any help would be appreciated.
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Too much current can blow a resistor, and relays CAN have their contacts welded together from too much current, causing them to fail in a particular 'setting'.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Exceeding the power dissipation rating of the resistor will do it every time.

    Select a resistor with a wattage rating that is twice what is required.

    Power in Watts = Voltage x Current = VoltageSquared / Resistance
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If there is several amps current involved with a few hundred volts, it's amazing how much of an arc will jump between relay contacts. They weld together easily after that.
     
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