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hi need to work with non-linear elements, for example a light bulb. I can create new items from its transfer function or the equation that represents the object's behavior?

@miltonfonseca,

Welcome to CL.

You can do this with behavioural sources:

https://www.circuitlab.com/docs/circuit-elements/#behavioralsources

driven by expressons:

https://www.circuitlab.com/docs/expressions/

and parameters:

https://www.circuitlab.com/blog/2013/10/01/circuit-parameters-to-make-schematics-smarter/

Here are a some more examples of behavioural sources being used this way:

https://www.circuitlab.com/circuit/wb4qg4/dielectric-dependent-capacitor-non-linearity-02/

(Note that the bug is the capacitor voltage scaling referred to in the Y5V curve example may be fixed by now.)

Carl Sawtell's CdS photoresistor and my slight variation might be worth a look:

https://www.circuitlab.com/circuit/tbrz2g/cds-photoresistor-model/

https://www.circuitlab.com/circuit/8539c8/cds-photoresistor-model-02/

https://www.circuitlab.com/circuit/ywa754/behavioural-resistor-01/

https://www.circuitlab.com/circuit/s46352/12au7/

Search CL for behavioural for more.