Does the LM555 circuit work as intended or did I mess something up?

[llaffer]

I'm trying to duplicate the Ben Eater 555 timer circuit as shown in this video: https://www.youtube.com/watch?v=kRlSFm519Bo

My cru file can be downloaded from this link: https://1drv.ms/u/c/7e033efef8f2402f/EXOyOs_p-sFPs40wZBopp_MBHHXH746X90LhVi736mH0Uw?e=BXvqeX

Just wondering if I made a mistake in constructing it or if the 555 chip doesn't function as a real chip would.

Thanks.

[mike.bushell]

It certainly does, it is modelled on a standard “perfect” model. Try turning up the simulator frequency to make sure that it works if you are using small capacitor values

In the recent video I’ve done with the new update, my 8bit clock module is built exactly as per Ben eaters guide 😌

https://youtu.be/JnqHqxYl2Cg?si=k8hfR6LVCTQcRPB4

I shall take a look at your file

[mike.bushell]

Really simple solution. You are missing a live input to the |RST pin, its an inverted logic pin. So reset is enable when low or floating

Simply connect 5v to the pin and it works

[AdmiralVonGilbert]

Thanks Mike! I stumbled upon the same issue. In the linked video, you can see that the Reset pin is also floating. Looks like the 555 Ben used does not require the RST pin to be connected. :)

//Edit: Maybe your ICs could benefit from some kind of datasheets?
//Edit2: In the linked video, Ben is talking about that Pin starting at 23:30 :)

[llaffer]

Originally posted by mike.bushell:

Really simple solution. You are missing a live input to the |RST pin, its an inverted logic pin. So reset is enable when low or floating

Simply connect 5v to the pin and it works

Thanks. That worked.

[mike.bushell]

Originally posted by AdmiralVonGilbert:

Thanks Mike! I stumbled upon the same issue. In the linked video, you can see that the Reset pin is also floating. Looks like the 555 Ben used does not require the RST pin to be connected. :)

//Edit: Maybe your ICs could benefit from some kind of datasheets?
//Edit2: In the linked video, Ben is talking about that Pin starting at 23:30 :)

Yes it would appear that my “floating” value is biased to high

In theory, good practice is to not have any floating pins 😋 ones I release a component editor, the community can argue and make adjustments 😂😂

[llaffer]

I based that original design based on how his circuit worked at the start of the video. By the end of the video he did add the 5 volts to pin 4 and a few caps to pins 5 and 6, so I replicated those as well. Things are working well. Thanks again.