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How To Modify Model Train Controller?

Discussion in 'General Electronics Chat' started by muso52, Aug 18, 2017.

  1. dr pepper

    dr pepper Well-Known Member

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    Its been so long since you started the post I've forgotten what the aim was, but your right there will be a V drop across the const current source, and that will affect the minimum o/p voltagem dont forget though if your using a darlington it will drop 1.2V itself, so your 2V becomes 0.8v, and you could always bodge this a little putting a diode in series with the o/p dropping it another 0.6V and protecting the transistor.

    The ad654 looks like an interesting device, never used one of those.
    Heres a link to a calc for the 4046 vco if you need another option, one benefit is it has a programmable minimum frequency:
    http://www.changpuak.ch/electronics/calc_03.php
     
  2. muso52

    muso52 Member

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    Hi dr,
    I'm pretty ok with the dc voltage controller aspect of this project thanks to the like's of yourself and others so can I invite you to look at a new thread I hope to write later today with respect to very low frequency voltage to freq. convertor?
    The plot thickens but I hope you will consider it of interest as it unfolds!
    Willy
     
  3. dr pepper

    dr pepper Well-Known Member

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    Yup certainly will, progress is interesting.
     

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