MFSPICE is a simple electronic circuit simulator for Electric Circuits II course. From a list that describes a circuit (NETLIST), the program can predict the node voltage values.

python3 spice.py <netlist_file_name>

Circuit and NetList for circuit example:

R1  1  2  2
R2  2  0  4
R3  2  3  8
R4  1  3  4
I1  0  1  DC  3
F1  3  0  1  2  2
.DC

Obs: The program uses numpy lib for calculations.

Components format for NETLIST:

• Voltage Source: V<name> <a(node+)> <b(node-)> <source_type>
• Current Source: I<name> <a(node+)> <b(node-)> <source_type>
• Resistor: R<name> <a(node+)> <b(node-)> <R(resistence)>
• Capacitor: C<name> <a(node+)> <b(node-)> <C(capacitance)>
• Indutor: L<name> <a(node+)> <b(node-)> <L(inductance)>
• Mutual Inductance: K<name> <inductor_1_name> <inductor_2_name> <M(coupling_coefficient)>
• Voltage Controlled Current Source: G<name> <a(output_node+)> <b(output_node-)> <c(reference_node+)> <d(reference_node-)> <Gm(gain)>
• Voltage Controlled Voltage Source: E<name> <a(output_node+)> <b(output_node-)> <c(reference_node+)> <d(reference_node-)> <Av(gain)>
• Current Controlled Current Source: F<name> <a(output_node+)> <b(output_node-)> <c(reference_node+)> <d(reference_node-)> <Bi(gain)>
• Current Controlled Voltage Source: H<name> <a(output_node+)> <b(output_node-)> <c(reference_node+)> <d(reference_node-)> <Rm(gain)>
• Amp. op.: O<name> <a(output_node+)> <b(output_node-)> <c(input_node+)> <d(input_node-)>
• Source types:
  • DC <Value>
  • SIN <DC_level> <Amplitude> <Frequency> <Delay> <Attenuation> <Angle> <Cicles>

The last line in the Netlist file has one of these formats:

.DC

or

.SIN <frequency>

OBS: Currently the program only supports one frequency per circuit, so if it is not a DC circuit the frequency used is passed in the last line.

OBS_2: The order of the components in the netlist must be:

1. passive components(resistors, capacitors and inductors)
2. independent sources and AmpOps
3. current controlled sources
4. voltage controlled sources

• multi-frequency compatible (implement superposition)
• literal resolutions
• graphical user interface
• stories (share the circuit you're working with your friends) just kidding

• Queiroz, A.C.M. (2019). "Circuitos elétricos, métodos de análise e introdução à sintese".
• Alexander, C.K. and Sadiku, M.N.O. (2007). "Fundamentals of electric circuits".