Maybe option to choose op-amp type ?
I'm not sure about this one and I may be running into the limits of the program. I tried making a triangle-square wave generator using 3 op-amps - op1 is integrator with 100nf feedback, op2 is comparator with positive feedback (a voltage divider or a pot), and op3 is an inverter with output back to the input of op1. All resistors are 10kohm. 15V is assumed for all op-amps. I should be getting a triangle at op1 out and square wave at the other two. I'm not seeing this at all on the scope. Maybe the op-amp is 'too perfect' ? Maybe the voltage rails need to be there ? I don't know.
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Colin Reynolds
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I design variants of the circuit you describe pretty regularly and iCircuit works quite for most of them (it can get finicky when you put diodes in the feedback loop). One thing that the model has a problem with is that it behaves like an ideal op amp, with no input offset voltage or bias currents so some oscillator types require a small series voltage at one of the inputs to help run the comparator output to one of the supply rails...