Creating a circuit¶

Define from string¶

The most convenient method is to define a circuit with a string

from fasteis import Circuit

circ = Circuit("R1-(R2,C2)")

Here:

• R1 means a resistor R with label 1
• R2 means a resistor R with label 2
• C2 means a capacitor C with label 2
• A hyphen x-y means element x and y are in series
• Brackets (x,y) mean element x and y are in parallel

Labels can be any number, as long as elements do not have the same type and label.

Circuits can be arbitrarily nested and complex. See Element in the API reference for the available elements.

E.g. for a suppressed two arc circuit with finite length Warburg diffusion:

from fasteis import Circuit

circ = Circuit("R0-(R1,CPE1)-(R2-Wo2,CPE2)")

Setting parameter values¶

Use with_values(...) and supply a list of values in order of elements and their attributes:

from fasteis import Circuit

circ = Circuit("R1-(R2,C2)").with_values([10.0, 20.0, 1e-3])

Or use with_named_values(...) and supply a dict of "{element}.{attribute}": value:

circ = Circuit("R1-(R2,C2)").with_named_values(
    {
        "R1.r": 10.0,
        "R2.r": 20.0,
        "C2.c": 1e-3,
    }
)

Define from Python objects¶

You can also create a circuit from element objects directly by giving Series and Parallel lists of Element objects.

The Element objects accept positional or named arguments, e.g. R(10.0) and R(r=10.0) are both valid.

from fasteis import Series, Parallel, R, C

circ = Series([R(10.0), Parallel([R(5.0),C(1e-3)])])