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Boost Dieing AA

Discussion in 'Electronic Design' started by BeeJ, Oct 9, 2012.

  1. BeeJ

    BeeJ Guest

    Looking for that circuit that boosts very low voltages, around 0.3VDC,
    up to 3 to 5 VDC.
    The circuit used a germanium transistor in an oscillator configuration
    to do it. Anybody know where to find the circuit?
     
  2. Tim Williams

    Tim Williams Guest

    Works the same either way.

    Perhaps you're thinking specifically of an old Fred Nachbaur circuit which
    appeared in Electronics Now, I think ca. 1995? IIRC, it was a
    two-transistor chopper, which is just a two-headed joule thief.

    LOL, we've been here before..
    http://sci.tech-archive.net/Archive/sci.electronics.design/2008-04/msg04282.html
    though I don't have immediate access to the article.

    Can't find any hits online.

    Tim
     
  3. Guest

    What's the point? There's no energy left in the chemistries I can
    think of at 0.3v.
     
  4. Guest

    I've made simple boost converters from silicon BJTs that work to
    ~550mV. Theoretically you could get lower than that--Si BJTs still
    work well below 600mV Vbe if i(c)'s super low enough. But, there's no
    point. The i^2r losses make it grossly inefficient, and the battery
    realities are that there's nothing there to harvest.

    Win Hill's reports almost tempted me into making a, say, 10nA
    bootstrap stage, just for silliness. But, I got over it.
     
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