Oscillator circuit help needed

Discussion in 'The Projects Forum' started by Denym, Feb 7, 2012.

  1. Denym

    Thread Starter New Member

    Feb 7, 2012
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    0
    Hi everyone, I have been trying to build an oscillator circuit that is the super penny oscillator by ibpointless without the magnet or antenna, I am using a 2.4 to 3.7v power source, what is happening is that if in the section with the 1 nf cap has a 1 mega ohm resistor it does not trigger the transistor, if it is replaced with a 1k resistor the circuit seems to be shorting (the led goes out) can anyone help me out with getting this circuit going?
     
    Last edited: Feb 7, 2012
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Welcome to AAC!

    How about

    1> a schematic

    2> a Link?

    Telepathy has never been my strong suite.
     
  3. Denym

    Thread Starter New Member

    Feb 7, 2012
    2
    0
    Last edited: Feb 7, 2012
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Try a voltage range from about 1v to 1.4v.

    It won't work with voltages above around 2.1v - not in simulation, at least.
     
  5. DickCappels

    Moderator

    Aug 21, 2008
    2,656
    632
    Sgt. Wookie's solution should get it running.

    If for some reason it still doesn't oscillate, make sure the two coils are magnetically coupled, and properly phased with respect to one-another. Usually the two coils are either wound as two parallel winding on the same core or coil form, or wound as a center-tapped inductor -winding as a center tapped inductor assures both coupling and phasing are correct.

    Also, make sure you have the transistor connected correctly (you would be surprised at how many people have a problem with that).

    After that, I would reduce the base resistor in case your 2N2222 doesn't have high enough gain.

    After that, eliminate the 1 nf capacitor.
     
  6. Experimentonomen

    Member

    Feb 16, 2011
    331
    46
    That looks alot like a joule thief.
     
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Yes, the circuit is called a Joule Thief.
     
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