to construct inductor

Discussion in 'General Electronics Chat' started by rabiya, Nov 20, 2011.

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  1. rabiya

    Thread Starter New Member

    Nov 20, 2011
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    can anyone please tell me the accurate parameters for constructing 1nH and2.2nH.............please...i need it urgently.......


    thanks in advance
     
  2. steveb

    Senior Member

    Jul 3, 2008
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    Those are very small values, in the range of stray inductance of leads and wires; hence, it's very difficult to get accurate parameters. But, a straight piece of wire less than 1 cm in length, or a small single turn loop inductor, of even smaller diameter, might get you in that range. If you are making a printed circuit board, then you can make a trace behave as the inductor.

    You need to know current levels to get the right wire diameter.
     
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  3. SgtWookie

    Expert

    Jul 17, 2007
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    You couldn't use a whole loop. More like a slight kink in a very short piece of wire.

    The leads on a TO220 package have somewhere between 4nH and 8nH inductance, depending on how long you cut them off - and they are straight and flat.
     
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  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    1/2 turn of a 1/4 watt resistor wire around a 1/4 watt resistor is about 5nH, can't really tell since my hand near it changed the reading a lot.

    Are you sure you didn't mean millihenry or microhenry?
     
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  5. rabiya

    Thread Starter New Member

    Nov 20, 2011
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    no no its nH only.

    thanks a lot to you people.
     
  6. steveb

    Senior Member

    Jul 3, 2008
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    I think that's true from a practical point of view. The reason why I mentioned this is because a single loop inductance formula indicated that a 36 gauge magnet wire wound with a 1 mm single loop would make a 1.4 nH inductor. This is barely in the practical range, but then one needs to consider lead connections and the difficulty of doing this accurately.

    It would be interesting to know the details of the application and the frequency range. Is this a radio frequency design, ... microwave ... ? What are the other components in the system, what is their size and how are they connected?
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The circuit you show is a cell phone jammer.
    Those circuits are NOT allowed over here.

    Bertus
     
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