help in function generator Project

Discussion in 'The Projects Forum' started by M070RealKing, Apr 18, 2013.

  1. M070RealKing

    Thread Starter New Member

    Apr 18, 2013
    2
    0
    hi!
    I'm working on function generator Project , but there is a problem i can't solved .
    the problem in the triangle wave like this :
    [​IMG]


    Such as in the picture, the field of My function generator between 5v-3v and the real 5v-0v.
    here the circuit :

    [​IMG]


    and Thanks :)
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,965
    743
    as its a schmidt gate ic, the voltage across C1 will swing from 1/3 to 2/3 of the supply, so thats 3V to 6v output.
     
    M070RealKing likes this.
  3. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,672
    2,706
    Best I can tell, the circuit shown shouldn't even oscillate....
     
    M070RealKing likes this.
  4. M070RealKing

    Thread Starter New Member

    Apr 18, 2013
    2
    0
    thanks guys !
    Problem solved :rolleyes: but after hours of headaches and tests,
    here's the schema :
    [​IMG]

    I wish if I can help who faced the same problem :(
     
  5. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
    Look at this:
    OpAmp Triangle Generator

    Notice the triangle wave from the 74HC14 is slightly curved and not symmetrical. This is due to the non-linear charging of the capacitor through the resistor.
    An op-amp provides constant current charging which gives a more linear triangle wave.
     
    Last edited: Apr 19, 2013
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