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inductor questions

Discussion in 'Electronic Basics' started by Eric R Snow, Aug 2, 2004.

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  1. Eric R Snow

    Eric R Snow Guest

    The Jameco catalog doesn't have any inductors that are 1000
    micro-henrys. Only less. Can these be connected in parallel or series
    to increase the inductance? Or is it easy to wind my own accurately?
    How can the inductance be measured? I have a Tek 465B 'scope but I'm
    still learning how to use it and don't know if it can be used to
    measure inductance.
    Do I need a ferrite core? I have a machine shop so making the
    mechanical parts to wind coils is easy for me.
    Thank You,
    Eric R Snow
     
  2. Activ8

    Activ8 Guest

    Series, but check Mouser and I forget who else I've ordered from.
    Could be.
    With a Dip meter or inductance meter.
    It would just be acting as a volt meter.
    Probably. It would lower the turn count but without knowing your
    application I can't say.
    Great. I'll do your electronics and you do my machine work ;)
     
  3. Digikey sells lots of inductors in the 1000 uHy and above range. The
    other critical specifications for any inductor are the current rating
    (both thermal and core saturation may be involved), the self resonant
    frequency (above which, it looks like a capacitor, instead of an
    inductor), the DC resistance (affects the heat it produces) and the
    effective Q (quality factor) at a given frequency, if you are going to
    use it in a tuned application.

    Inductors are one of the few kinds of components you can mak,
    yourself, that rival the quality of what you can buy. You will need
    enameled wire of the appropriate size, and ferrite or powdered cores
    and possibly plastic winding bobbins. The cores and bobbins are what
    are hard to find. But some are available. For radio frequency
    inductors, you often need only a form to hold the wire, with air
    making up the magnetic field path. The whole story is more than I can
    put in 1 post.

    The best way to measure inductance is with a meter made for the
    purpose, but all sorts of inductance bridge measurements are possible
    that include a scope or meter as a magnitude and/or phase display that
    you watch while you null the bridge with known components.
     
  4. BobGardner

    BobGardner Guest

    How can the inductance be measured?

    Resonate against known value cap. f=1/2*pi*sqrt(LC)
     
  5. Richard

    Richard Guest


    Funny, I still have an "Allied Radio Corp" coil calculator (paper
    slide rule) for dimensions so you can wind your own RF inductors.
    From high school days, back when we had to walk 10 miles through chest
    deep snow to get to school...
    Richard
     
  6. Tom Biasi

    Tom Biasi Guest

    From high school days, back when we had to walk 10 miles through chest
    deep snow to get to school...

    Up hill both ways?
     
  7. Rich Grise

    Rich Grise Guest

    You had snow? We had to swim through the magma that was yet to become
    crust...
     
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