As a part of my school project I have a timer astable with NE555 and I need to generate a square signal. It has 12V supply and 65% duty cycle normally.
In my simulation on LTSpice I get exactly what I want but when I do the setup on my breadboard, although I have the same duty cycle I don't have 12V-0 as the peaks for my output, it is 10.4V.
It's not a very important problem but since it's a school project I have to explain the cause of a such difference in my report.
I can't read the manufacturer's name on the component and I have tried with different NE555 we have in the lab but there is always an offset of about 1,5V. Probably it's because something inside is not ideal but I just need to know what.
I put the setup just in case.