Esaki Effect LED Flasher

Discussion in 'The Projects Forum' started by so54i88, Jun 15, 2011.

  1. so54i88

    Thread Starter New Member

    Sep 23, 2010
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    Hello all...I've been experimenting with different simple led flasher circuits with minimum number of components. I like the effect achieved by Easki circuit but it requires 12v or more. Can someone enlighten me what this is the case? Ideally, I'd like to use a 3-6v power source. Can someone help me please? Thank you in advance.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Perhaps you can give us a link to the Easki circuit?
     
  3. #12

    Expert

    Nov 30, 2010
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    Like the man said in the video, it absolutey, positively, must be (at least) 12 volts because you are depending on the reverse breakdown voltage of the base-emitter junction. They often require 7 to 9 volts to break down like a zener diode.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    And on top of the 7 to 9v to break down the PN junction, you need a few more volts for the LED and the voltage drop across the resistors in the circuit.

    You would need to build a boost converter circuit to run it from lower than 12v, but that defeats the point.
     
  5. #12

    Expert

    Nov 30, 2010
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    I would like to correct myself...

    I remember that there is a certain part number of transistor that is sorted for less than 6 volts reverse breakdown, but I can't remember the part number. Still, even with a transistor that is sorted for low breakdown voltage, add the LED voltage and base to collector junction, you could maybe, just barely do it with 9 volts...maybe.
     
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