hey eric, all op amps are universal opamp

Hi Lee,
I see that, but the original drawing suggests a type with additional pins??
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hi Lee,
This what I have so far with a 'fudge' mod on IC2.
Note the BAT diodes D1 ,D2.
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BTW my pot symbols are different from yours.View attachment 364906

that looks perfect, what is the "fudge" mod though? do our pots behave the same regardless of the symbols? and would the output change if the postion if S1 is switched to S2?

 

Hi Lee,
I see that, but the original drawing suggests a type with additional pins??
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Apologies, the original drawing has caused me confusion. However, i double checked and found that IC1 is TL074 and IC2 is a CA3140, but i cant find these models on LTspice. I attached the components list.

 

hi Lee,
Files to build CA3140 and TL074
PDF for CA3140, note the extra pins.

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hi Lee,
Files to build CA3140 and TL074
PDF for CA3140, note the extra pins.

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hey there, thank you for the files. I replaced the opamps with the new models and im getting an error

 

hi Lee,
If you need to create a CA3140 with offset pins, check this link
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https://www.google.com/search?q=lts...vCBwgwLjYuMTMuMcgHUYAIAQ&sclient=gws-wiz-serp

 

Hi Lee,
Are you using OneDrive as your LTSpice folder???
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Hi Lee,
Are you using OneDrive as your LTSpice folder???
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im using file explorer, and i added the sym and sub files of the 2 op amps you sent me, but im not sure where to add the .lib file for the tl074

 

im using file explorer, and i added the sym and sub files of the 2 op amps you sent me, but im not sure where to add the .lib file for the tl074

the problem occurs for te ca3140 op amp, i assume its missing a file? not sure though.