Triangle Oscillator Cont....

Discussion in 'The Projects Forum' started by rueffy, Oct 15, 2013.

  1. rueffy

    Thread Starter Member

    Jun 29, 2013
    39
    3
    Hi,

    Some of you may remember I was trying to generate a stable Triangle Wave Oscillator a few months back. Still cracking away at it, have made some vast improvements and am very close to finished but I have one final problem to solve. As can be seen from images I have some ringing or spiking at the threshold points, this only started occurring once I introduced the TL071's as the op amp of choice replacing the 741's. The TL's are giving me a much better slew rate and sharper triangle wave however. Any ideas on how to solve this one?

    Thanks,
    Rueffy.

    CIRCUIT
    [​IMG]

    WAVEFORM
    [​IMG]

    CLOSE UP OF THRESHOLD SWITCH
    [​IMG]
     
  2. iimagine

    Active Member

    Dec 20, 2010
    129
    9
    Why not help me test my 7 transistor circuit instead? If it works it would be very efficient...and then we can talk about stabilizing it :D
     
  3. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,059
    3,820
    What kind of power supply do you have? It looks like you have a virtual ground made by a pair of resistors only. If that is the case, make an active virtual ground with an op amp follower circuit.
     
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