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2V/6V signal dropped to TTL levels?

Discussion in 'General Electronics Discussion' started by sirch, Jul 2, 2013.

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  1. sirch

    sirch

    109
    1
    Dec 6, 2012
    I have a signal that swings between around 2V and 6V and I would like to use this as the input to a micro-controller, is there a simple way of getting the signal down to TTL levels – e.g. 0-5V?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,516
    2,651
    Nov 17, 2011
    A very simple circuit uses two diodes in series with the input signal plus a resistor (e.g. 1kOhm)
    [​IMG]
    You can use a single 2.7V zener diode instead - note that the zener diode is connected with cathode to "in".
     

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  3. sirch

    sirch

    109
    1
    Dec 6, 2012
    Thanks Harald that's great. Why didn't I think of that - inexperience I guess
     
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