Capacitor discharge

Discussion in 'General Electronics Chat' started by Bloc Riff Nut, May 16, 2011.

  1. Bloc Riff Nut

    Thread Starter New Member

    May 16, 2011
    1
    0
    Hi gents/ladies,

    This is my first post so please bear with me.

    I want to do some repair work on my tube/valve amplifier and need some advice on discharging the filter capacitors. I was thinking of making a discharge tool comprising of a 10Kohm resistor, wire and crocodile clips.
    I don't know the formula for the time it takes to discharge the capacitors using the 10K resistor. Could someone help this blind fool out. :confused:

    The amp contains the following capacitors;-
    220nF 400v Poly, 100nF 350v Poly, 22uF 450 Axial, 220uF 400v Radial, 1000uF 63v Axial.

    Yours,

    Phil.
     
  2. #12

    Expert

    Nov 30, 2010
    16,278
    6,791
    The formula written on my wall says, Vo=dV (e^-t/rc)

    so Vcap = original Vcap times e to the negative time over (resistance x capacitance)
     
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