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CPA200 - LTspice missing nodes error
CPA200 - LTspice missing nodes error
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Old 19th June 2018, 01:11 PM   #1
janusz is offline janusz  Australia
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Default CPA200 - LTspice missing nodes error

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
Attached Images
File Type: jpg CPA200_V3.0_sch.jpg (179.8 KB, 89 views)
Attached Files
File Type: asc cpa200_1.asc (22.5 KB, 11 views)
File Type: asc cpa200_2.asc (24.3 KB, 7 views)

Last edited by janusz; 19th June 2018 at 01:13 PM.
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Old 19th June 2018, 01:47 PM   #2
Mooly is offline Mooly  United Kingdom
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CPA200 - LTspice missing nodes error
It seems related to the 'variable' command you placed next to R21 and the bias preset.
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Old 19th June 2018, 01:53 PM   #3
jazbo8 is offline jazbo8
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CPA200 - LTspice missing nodes error
You have an eagle eye! BTW, I tried to include the discrete models.txt, but there are still a bunch of missing models, do you have all of them running in the sim?
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Old 19th June 2018, 01:56 PM   #4
Mooly is offline Mooly  United Kingdom
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CPA200 - LTspice missing nodes error
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
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Old 19th June 2018, 02:00 PM   #5
Mooly is offline Mooly  United Kingdom
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CPA200 - LTspice missing nodes error
Try this (cut my discrete models command out and replace with yours). There is no bias current as I snipped the pot out.
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File Type: asc cpa200_1.asc (21.4 KB, 10 views)
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Old 19th June 2018, 02:32 PM   #6
jazbo8 is offline jazbo8
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CPA200 - LTspice missing nodes error
Forgot I was running IV, updated the library and the sim ran ok.
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Old 21st June 2018, 01:03 PM   #7
janusz is offline janusz  Australia
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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,

Last edited by janusz; 21st June 2018 at 01:07 PM.
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Old 21st June 2018, 04:56 PM   #8
Mooly is offline Mooly  United Kingdom
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CPA200 - LTspice missing nodes error
I didn't test it much beyond just getting the sim to run tbh.
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