I want generate a 5 volt, around 55 Hz(50-60) square wave with an NE555S-13. In the datasheet, I found the configuration for astable operation which I assume is what I want: [![enter image description here][1]][1] screenshot from datasheet: https://www.diodes.com/assets/Datasheets/NE555_SA555_NA555.pdf I found that the NE555S-13 is featured in the [Falstad web simulator.](https://www.falstad.com/circuit/) The problem is that in Falstad, the configuration for square generation is different and I don't know what to make of it, the main difference I see is that the "output" is pulled up to 5 volts at the Vcc pin in the datasheet's example while in the Falstad simulation it's pulled up at the trigger pin. Is there some significant difference because when I simulated both configurations I saw seemingly similar results in the wave generation. Is there something I am not seeing? [![enter image description here][2]][2] [![enter image description here][3]][3] [1]: https://i.sstatic.net/JDw90b2C.png [2]: https://i.sstatic.net/89GfiwTK.png [3]: https://i.sstatic.net/V0AbGf7t.png