Re: [Qucs-devel] Creating a component model

[Stefan J. <st...@gr...>]

Am Di, 5.04.2011, 21:13 schrieb Keith Roberts:

Hi!

> I'm trying to create a component for the LM358 Dual Op Amp,
> and it looks like I need to specify the actual internal
> schematic of the LM358 circuitry, in my library file. Is
> this correct?
>
> I have downloaded the Fairchild datasheet for their LM358
> from:
>
> http://www.datasheetcatalog.com/datasheets_pdf/L/M/3/5/LM358.shtml
>
> Any tips on how to modify an existing OP Amp model to make
> it compatible for the LM358 would be appreciated.
>
> So far I have copied the OpAmps.lib file to
> AAA-karOpAmps.lib and am modifying the 4th entry for the
> ua741(mod) Op Amp.
>
> I have changed the component diagram to show the new name,
> but I still need help on getting the internal specification
> of the .def section set correctly for the LM358 so the
> simulator works OK.

For that purpose, you can try to find an appropriate SPICE definition
of the model and insert it into a schematic using the SPICE file
component.  When trying to simulation this schematic, you'll get the
Qucs netlist representation.

Best regards, Stefan.