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Eico 324 inductors

Discussion in 'Datasheets, Manuals and Component Identification' started by alfa88, Jan 14, 2021 at 12:26 AM.

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  1. alfa88


    Dec 1, 2010
    I'm restoring an EICO 324 Sig Gen and while I find the documentation is readily available a closer look reveals that the actual inductor values are missing and simply referred to as coil "A" through coil "E". Not that I need to change them but it would be nice to know.

    Attached Files:

  2. shrtrnd


    Jan 15, 2010
    Holy cripes. Variable Inductors that need to be tweaked for calibration.
    If the manufacturer doesn't list the values, (and I found the need to know), I would probably
    pull each one and put it on a Sencore Z-Meter to find the values.
    Somebody here might have another idea, but that's mine.
  3. alfa88


    Dec 1, 2010
    I had another thought but pretty much ran into a dead end. The circuit uses a tank circuit via a variable air capacitor. If I have the low and high values of said part I just do a lot of calculations. I don't have a cap tester with me but maybe someone out there has some insight.

    Attached Files:

  4. bertus

    bertus Moderator

    Nov 8, 2019


    Dec 19, 2019
    Yes if you knew the low and high value of the variable capacitor, you can determine the inductance. I have a chart that lists frequency and L and C impedances. A long time ago I saw a parallel tank circuit that used a 5-30pF variable but no value for the inductor. At 30pF it resonated at 70MHZ, at 5pF it resonated at 130MHZ. Using a ruler I "connected the dots" to determine it was a something like a .1uH inductor.
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