Time delays on the order of seconds can be generated using 555 timer circuits, provided the timing capacitor values do not exceed the limit specified by 555 datasheets. When the time delay needed goes ...

[Mano Arrostita] has a video about simulating delay and timer circuits in LTSpice. The video isn’t specifically about the 555, but it does show how the basic circuits inside a timer chip work.

[Mano Arrostita] has a video about simulating delay and timer circuits in LTSpice. The video isn’t specifically about the 555, but it does show how the basic circuits inside a timer chip work.