what is the most efficient joule thief I can build with one transistor?

Discussion in 'General Electronics Chat' started by volt879, Jul 1, 2016.

  1. volt879

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    Mar 27, 2016
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    what is the most efficient joule thief I can build with one transistor?
     
  2. ElectronicMotor

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    May 1, 2016
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    As a jewel thief, I use the three legged variety, as they run faster.
     
    Last edited: Jul 1, 2016
  3. volt879

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    Mar 27, 2016
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    i mean the joule thief voltage elevator
     
  4. Alec_t

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    Sep 17, 2013
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    The most efficient would used ideal components, but in reality you would probably choose a transistor with very high current gain and very low saturation voltage, a transformer with minimal wire resistance, a capacitor with minimal ESR.
     
  5. volt879

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    Mar 27, 2016
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    thanks.and what can be the transistor you said?
     
  6. Papabravo

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    It's all in the datsheets, you just have to look.
     
  7. volt879

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    Mar 27, 2016
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    ok.but is there a way to make a joule thief more efficient by adding capacitor or other resistor?? or making the circuit LC resonant?
     
  8. Alec_t

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    More efficient than what? You haven't posted a schematic of the circuit you have in mind.
     
  9. volt879

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    Mar 27, 2016
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    the classical one transistor tapped coil circuit
     
  10. Papabravo

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    Your words fail to communicate what you are talking about. A picture is worth several thousand words. Also how do you define and measure efficiency?
     
  11. ronv

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  12. volt879

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    Mar 27, 2016
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    thank you
     
  13. volt879

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    Mar 27, 2016
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    this is the basic version of the circuit I meant.[​IMG]
     
  14. volt879

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    Mar 27, 2016
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    it is this
     
  15. bertus

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  16. volt879

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    Mar 27, 2016
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    ok.thank you
     
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