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Sine wave generator

Discussion in 'Electronic Design' started by Noonie, Nov 25, 2003.

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  1. Noonie

    Noonie Guest

    I am doing a project on a sine wave generator circuit. problem: when I
    simulated it, it gave me triangular wave instead of sine!!!
    So, Could you please help me discover what's wrong?!
    The circuit schematic is on the following site:

    Thanks in advance...
  2. Fred Bloggs

    Fred Bloggs Guest

    The most likely problem is that the thermal time constant of your
    incandescent bulb is too short- this is a non-trivial modeling problem
    that requires you to produce a resistance as a non-linear function of an
    integration of the RMS bulb current over several thermal time constants
    of past history. I have never done this simulation but it seems the only
    hope of producing a useful SPICE simulation would be to bound the
    circuit by theoretical calculation, linearize a bulb model around small
    variation at steady state, and run a circuit model with calculated
    steady state node initialization values. Have fun...
  3. I read in that Fred Bloggs <>
    I doubt if it's as simple as that. (;-)

    Just build it and see if the simulation is correct. By the time you've
    corrected the simulation from first principles, you could probably have
    built and tested a hundred oscillators.
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