We start out by using electronic circuit simulation software to design the circuit and tweak in component values. You can define your power supply voltages, input signal type, frequency and amplitude, and your test conditions.
Once you’ve designed your circuit and assigned the component values on the bottom half of the screen, you can plot simulated output signals on the top half of the screen. Just click your mouse pointer on any node in the circuit diagram to see the simulated output at that point in the circuit.