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4

In your top circuit Zab plays no role at all, except to pass some pointless current. It's connected directly across two voltage sources, one (the input) that doesn't care one iota what's connected to it, and the other (the opamp output) which will adopt whatever voltage is necessary to bring its inverting input potential to zero (to equal the voltage at its ...


0

It seems that your model is probably "bad" or "bad use" (I see DTC is grounded ?, see my schematic, others things missed ?). Here is a simulation with another simulator (operational test circuit from TI, datasheet of TL494). In this model, frequency changes with R and/or C. In TRANS analysis, click on component and use arrows keys up or ...


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