inductor help

Discussion in 'The Projects Forum' started by markosillypig, Mar 30, 2013.

  1. markosillypig

    Thread Starter AAC Fanatic!

    Jul 21, 2008
    hi everyone
    could do with a little help here
    i have a schematic of a transmitter but the problem i have is this
    the area marked in red says 5 turns of 0.5mm 3.5mm dia
    so is it 5 turns of 0.5mm over 3.5mm in wound length
    or is it 5 turns of 0.5mm to 3.5mm enameled wire
    or is it 0.5mm wire 5 turns over a 3.5mm non inductive core
    for any help

  2. #12


    Nov 30, 2010
    First, let us declare that the wire diameter is .5mm. It does not need an enamel coating at 3 volts unless it is going to be very bunched up, so I will ignore coating thickness. The original formula refers to "mean diameter" and that would mean a form that is 3.25mm OD on which you wind 5 turns. Most people use a bolt to get the windings evenly spaced. After the project is built and the frequency is wrong, they bend the coils to use up more length, thus lowering the inductance.

    ps, it is probably "air core". Air has a permeability and that is probably what is wanted.
    Last edited: Mar 30, 2013
  3. aanya

    New Member

    Apr 4, 2013
    hey whozsoevr dis post iz..can u plz tell is this ckt u provided here worked or not ???...can u give a little description of it !