LTspice question

Discussion in 'General Electronics Chat' started by Kermit2, Sep 14, 2010.

  1. Kermit2

    Thread Starter AAC Fanatic!

    Feb 5, 2010
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    I'm a breadboard guy, from way back. Haven't done any of it in ages though. So with all the talk and referenced to spice i've seen here, I downloaded it and am playing around to get a feel for how it functions.

    I'm a little puzzled by the lack of two input logic devices. They all seem to be three input models, but that's OK.

    What I need to know is how do you get a gate to give a 5 volt output amplitude. I'm triggering an AND gate with two different speed pulses and it functions correctly for the inputs I'm giving, but WHY does it only go to 1 volt amplitude? ???
     
  2. eblc1388

    Senior Member

    Nov 28, 2008
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    You can change the logic high output voltage by right clicking on the AND gate and in the popup menu, enters "VHigh=5" in the attribute row(i.e. the fourth row) marked "Value".

    [​IMG]
     
  3. Kermit2

    Thread Starter AAC Fanatic!

    Feb 5, 2010
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    That's easier than I thought it would be. I spent most of the night(since I wasn't sleeping anyway) reading through the library and trying to figure out how the model info is written and what its doing, then I went looking for the 'AND' gate model only to discover that it wasn't there. :confused:

    Still I learned alot, and increased my desire to break out my old breadboarding stuff as well. :)

    Thanks for the answer,
    Kermit
     
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