coil/antenna design

Discussion in 'General Electronics Chat' started by pafrazier, Jun 25, 2012.

  1. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
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    Hi,

    I am trying some different coil/ antenna designs. I am picking up some a/c voltage on the coil. I figure it is from the house wiring. However it is also registering a dc voltage as well. Is that normal? I am not sure about the current.

    Thanks
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
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    ???
    coil/antenna for what exactly? What did you use to measure the voltages?
     
  3. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
    57
    0
    Hi,

    I read it with a voltmeter. The voltmeter registered constant 2.8 volts a/c with a 60 hertz frequency. The d/c was not steady but seemed to be discharging. Is this normal?

    Thanks
     
  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    A piece of wire should not have any dc voltage on it, so i guess you´re still not telling something.
    Please post a schematic and tell me what are you measuring or doing with that antenna.
     
  5. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
    57
    0
    Hi Kubeek,

    Please see attached file. The coil/antenna is something I developed and have been working with it for some time.

    There is a dc voltage across c1. It seems that the charge builds up over time and when I measure the voltage across c1 it appears to discharge from the coil. The discharge voltage varies depending on the network of coils.

    The ac voltage registers if the coil is not grounded. If I touch the ground lead of the voltmeter to ground and the postive lead to circuit the ac voltage registers in the circuit. It is a constant voltage.

    I can rectify the ac voltage and get a 3:1 ratio roughly of ac voltage to dc voltage.

    I hope that helps.

    Thanks
     
  6. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Some values maybe? Size of the coil? Anyway you are probably getting some static chrage from the air on the capacitor or are looking at the memory effect if it is electrolytic. Anyway i don´t see what this kind of setup could possibly be used for.
     
  7. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
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    HI Kubeek,

    One circuit I was using the discharge was 3 volts dc and charged a 1uf capacitor to one volt.

    Thanks for your help
     
  8. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    FFS can you tell me what do you want to discuss when you basically dont say anything?
     
  9. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
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    0
    Ok. No further questions.

    Thanks again.
     
  10. radiohead

    Active Member

    May 28, 2009
    474
    31
    Can you post a photo of your coil antenna and tell us what the antenna is intended to pick up?
     
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