LTSpice Unit Step Function (Heaviside) and Time-dependent Switch RLC Circuits

We will learn to implement:
1. Unit step function
2. Time based Switch (Another way of looking at the Unit Step Function)
3. RC Circuits
4. RL Circuits
5. Transient response of the system.

[juanjorojash]

You can easily define a step function using a "arbitrary behavioral source" and define their voltage or current using the step function as "{2*u(time - 1)}" for example... that will be 0 below 1s and 2 above 1s

[Jnglfvr]

Much easier to just define 0 volts at t1 =0 and then 20 volts at t2 = 1 microsec. Runtime 20 ms and you won't have to expand a graph that's scaled in units of full seconds. Also technically u(t) is zero until t =0. If you want the function that is zero until t = 1 then that would be u(t-1).

[Aaron-lpzt]

I followed your instructions exactly and my plot shows a flat line