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capacitor question on lundahl pulse transformer input

Discussion in 'General Electronics Discussion' started by bazz, Jan 11, 2018.

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  1. bazz


    Jul 11, 2017
    hi ive recently replaced the pulse transformer in my metrum octave dac with a lundahl 1572 ,it requires a .01 cap on the input which i fitted ,then i noticed downstream was a SMC capacitor ,the value i know not(KA5 ???) IMG_20180108_233318(2).jpg ,my question is should i bypass the SMC cap with the one ive fitted,or ditch the one ive fitted and use the SMC cap ?

    this is the original pulse transformer

    and the new one -input below the 2,earth below 1,both connected to the resister ,input also connected to the cap

    looks like KA5 printed on the cap ?

    Attached Files:

  2. davenn

    davenn Moderator

    Sep 5, 2009

    if you cannot find service info for the board, then you will have to remove the cap and measure it with a capacitance meter
    it's value could be anything between 10nF and 100nF (.01uF to .1uF)
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
  4. bazz


    Jul 11, 2017
    many thanks, looks like its the wrong value,so ive bypassed it with great results,thanks.
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