What are these inductors?

Discussion in 'General Electronics Chat' started by brightnight1, Oct 2, 2018.

  1. brightnight1

    Thread Starter Member

    Jan 13, 2018
    46
    1
    I have three questions I'm hoping to get help with.

    1) I'm wondering if someone could help me identify the inductors L1 and L3 in the circuit. I see L2 and that makes sense to me as a single inductor, but for L1 and L3 it looks like an inductor with an iron core on one side and a variable cap...Did I read that correctly? Is that typical for some applications and is there a common name for this inductor and cap setup? Bonus points if you know the purpose of the components ;)

    2) Would you agree that there is 4 way connection within the red circle?

    3) Why list a schematic with polarized caps? I guess the benefit is it gives you the option to use polarized or unpolarized caps, but is there any benefit to unpolarized caps...are they usually smaller or something? Am I missing something else? Why not just always use unpolarized caps? Thanks in advance!


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  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,413
    5,654
    brightnight1 likes this.
  3. brightnight1

    Thread Starter Member

    Jan 13, 2018
    46
    1
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