I need Help!!!
The attached cpa200 amplifier schematic refuses to be simulated in LT spice. The error message is "missing node(s)". I can't see that. The amp does not use any submodels, which could have some errors of that kind or anything like that. The amp is pretty standard and all the components are standard.
Could you please enlighten me and help to solve the problem.
Thanks,
cheers,
PS the second asc file has current limiter included
The attached cpa200 amplifier schematic refuses to be simulated in LT spice. The error message is "missing node(s)". I can't see that. The amp does not use any submodels, which could have some errors of that kind or anything like that. The amp is pretty standard and all the components are standard.
Could you please enlighten me and help to solve the problem.
Thanks,
cheers,
PS the second asc file has current limiter included
Attachments
Last edited:
No (lol) I added my usual 'discrete models' file and looked to see what errors were thrown up. I snipped the 4007 diodes out, used MJL21194c and MJL21193C for the outputs and MJE340/350 for the drivers. The two 12 volt zeners I used default models for. I think that was all I changed.
And I cut all the .op commands out and reverted to basics
And I cut all the .op commands out and reverted to basics
Great thanks, that was it. I placed variable and Var_500 as text but the system somehow automatically coded it as spice directive and I did not notice it. Great thanks again. Problem solved.
By the way, what do you think about this amp? AlexM asked me to simulate it as he's got pcb design for it. Now, that I have simulated it I see that it does not look so good.
cheers,
By the way, what do you think about this amp? AlexM asked me to simulate it as he's got pcb design for it. Now, that I have simulated it I see that it does not look so good.
cheers,
Last edited:
I also had a "missing node" error and I tried to find the solution; that way I found this thread.
My error came from a comment I made as a memory pad, but alas - - I had marked it as a 'Spice Directive'.
It was this:
Ticking the 'comment' box made the error disappear.
Hope this might help someone.
albert
My error came from a comment I made as a memory pad, but alas - - I had marked it as a 'Spice Directive'.
It was this:
laplace ((75e-6*s+1)*(3.183e-3*s+1))/((3.183e-4*s+1)*(3.183e-6*s+1))
that I wanted to store because I abbreviated the equation by taking out the last part of the equation.Ticking the 'comment' box made the error disappear.
Hope this might help someone.
albert
CPA200
Attachments
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Banda Frecvente.png63.7 KB · Views: 78
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Contest Power Amplifier V3.0.pdf40.3 KB · Views: 110
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CPA200 V3.0 Bode .png52.9 KB · Views: 71
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CPA200 V3.0 Limitare Uinput +10% .png61 KB · Views: 81
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CPA200 V3.0 1kHz sin 200w 8ohm.png59.3 KB · Views: 85
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CPA200 V3.0 FFT+THD 1Khz 200w.png62.2 KB · Views: 85
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CPA200 V3.0 Slew Rate.png22.3 KB · Views: 51
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FFT+THD-1Khz 200w.png174.9 KB · Views: 48
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limitare.png61.4 KB · Views: 50
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FFT+THD-1Khz Pnom.png183.2 KB · Views: 70
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