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Adding Independent Sources

An independent voltage source in SPICE is a circuit element that provides a constant voltage across its terminals, regardless of the current flowing through it.

An independent current source in SPICE is a circuit element that delivers a constant current regardless of the voltage across its terminals.

Adding Dependant Sources

A dependent voltage source in SPICE is a circuit element that generates a voltage proportional to a specified current or voltage in another part of the circuit.

A dependent current source in SPICE is a circuit element that produces a current proportional to a specified voltage or current elsewhere in the circuit.