i tried increasing simulation time but i don't get the square and triangle signals. there is no signal at allYou have told LTspice to stop simulating at 2 seconds. What frequency do you expect to see?
Also, it is often a problem using an op-amp without selecting a specific part. LTspice defaults to a model that does not always do what you would expect.
Astable multivibrator does not need external input to start it.maybe my question wasn't clear. what i meant was, do i need to apply an input voltage at the first stage, or is the circuit supposed to work like this. I am confused because there needs to be an input voltage/current for an opamp circuit, right?
That is the key to making it oscillate. Prior to a TRANSIENT (time domain) simulation, all Spice-derived simulators try to place all of the nodes in the circuit to a voltage derived from the way the circuit is biased. That puts the nodes where the circuit is ready to do what it is going to do later, but because, unlike in the real world, the simulation is noiseless, there is no perturbation to get amplified so that oscillation starts.great it works. i don't know why though. could you explain the .ic V(Y) = 1u?
The metastability problem comes up only in simulating oscillators or flip-flops; not with amplifiers. Skipping the initial DC bias solution is not appropriate for most of the circuits you will simulate.... There are an infinite number of ways to create this initial perturbation that it takes to get the circuit going...
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by Jake Hertz
by Jake Hertz