I would've tried to find answers that have already been given, but since the search facility here is, let's say, less than optimal, I'm asking here.
So I've got a circuit I want to simulate in LTspice, all set up and ready to go. I can run it, but I'm not getting the waveform I should be seeing (triangle wave).
I think there may be a problem with the op-amp model I'm using. I copied National Semi's model for the LM358, but I may have screwed it up: the symbol I inserted was a generic op amp ("opamp2"), and I gave LM358/NS (Nat'l.) as the value. Is this right?
It ran and gave me a flat waveform at the output until I connected U2 to power. Now it runs a bunch of iterations, very much slower, then gives an error message ("Singular matrix: check node u2:6 Iteration No. 1").
Isn't there some way to indicate that these 2 op-amps are in the same package, and only one of them needs power connections?
Lots more questions to follow ...
So I've got a circuit I want to simulate in LTspice, all set up and ready to go. I can run it, but I'm not getting the waveform I should be seeing (triangle wave).
I think there may be a problem with the op-amp model I'm using. I copied National Semi's model for the LM358, but I may have screwed it up: the symbol I inserted was a generic op amp ("opamp2"), and I gave LM358/NS (Nat'l.) as the value. Is this right?
It ran and gave me a flat waveform at the output until I connected U2 to power. Now it runs a bunch of iterations, very much slower, then gives an error message ("Singular matrix: check node u2:6 Iteration No. 1").
Isn't there some way to indicate that these 2 op-amps are in the same package, and only one of them needs power connections?
Lots more questions to follow ...