Inductors or filters/chokes???

Discussion in 'General Electronics Chat' started by mbohuntr, Oct 3, 2010.

  1. mbohuntr

    Thread Starter Active Member

    Apr 6, 2009
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    I bought these on ebay the other day thinking that if they were chokes, they would be labled as such. After reading a question here the other day, I gotta ask... I'm building a Colpitts oscillator....Thanks for the help.

    http://cgi.ebay.com/80-pcs-8-value-1uH-1mH-color-wheel-inductors_W0QQitemZ220466281597QQcategoryZ36338QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%252BDDSIC%26otn%3D10%26pmod%3D250701039404%26ps%3D63%26clkid%3D5243439749842248994
     
    Last edited: Oct 3, 2010
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,730
    759
    U need to give us more info on what you have , what you know and please show us the schematics
     
  3. mbohuntr

    Thread Starter Active Member

    Apr 6, 2009
    413
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    The link I provided shows some "inductors" from a chinese company. I was wondering if they are really chokes or "filters", and unsuitable for a colpitts oscillator?
     
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    Those are common encapsulated inductors and will work fine.

    A choke is just an older term for an inductor but still used and still the same thing, however when I think of a choke I think of something large with a core made to filter a power supply but that's only because I was around in the tube days.

    Of course we used the term interchangeably back then too, just a few turns of wire in an air-core situation could be referred to as a radio frequency choke.
     
  5. mbohuntr

    Thread Starter Active Member

    Apr 6, 2009
    413
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    Purrrfect!! thanks!!
     
  6. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    The term 'choke' is more of an application than it is a device. The term was common place years ago in power applications where one needed a filter or 'trap' to reduce noise or slow slew rates.
     
  7. bertus

    Administrator

    Apr 5, 2008
    15,634
    2,342
    Hello,

    Take a look at the PDF on RF-proto typing (attached).
    On the pages 8 - 10 there are the "chokes" discussed.

    Bertus
     
  8. mbohuntr

    Thread Starter Active Member

    Apr 6, 2009
    413
    32
    Thanks! I remember the professor talking about digital grounding, and traces acting as antenna's, but I guess I never put it together to de-couple it with an inductor.. Thanks all for the great info!!!
     
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