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I understand how to perform transient response with AC voltage source as input. My question is, how to make the AC voltage source ON at t1 and OFF at t2 (t2>t1>0) Any example could tell me how to do so?

In the list of circuit elements, in the Switches section, there is a time-controlled switch.

I have made a small simulation which operates on a single cycle of 112v 60Hz mains: ON at 3mS (t1); OFF at 13mS (t2). See TruncatedSine in EF82 public circuits.

Hope his helps.

Wow, it works. Thank you so much.