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Got a 2n2222 npn?

Discussion in 'General Electronics Discussion' started by cjdelphi, Apr 6, 2016.

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  1. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    Want one of the worlds simplest oscillators?

    Screenshot_2016-04-06-16-13-00.png

    Here's the end result, it's got three interesting features..

    1. It's an exploit of this type of transistor, as it should not really work

    2. Current is really quite low even though i used a 1000uf 16v cap only a few ma no more than 1 - 5ma, this would be an ideal security car alarm as it does not flash, it pulses which implies extra gubbins/circuitry which leads to the plausibility of it being a real car alarm

    3 the reverse collector/emitter once it reaces a certain voltage, the collector emitter opens up and the capacitor drains away to the led until the voltage is low enough and the transistor is pinched off


    It will run off a car battery for months if not years, very efficient considering
     
  2. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    Although stepping up the voltage might be required, i should try it at 11.8v
     
  3. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    (*steve*) did some experiments some time ago to look at the degradation of using a transistor in this way.
    The base/emitter voltage can also be exceeded with too much voltage applied to a two transistor bistable.
     
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