Hi
I'm working on a project.
I want to have a time for two days. I am limited to 555 timers only can u please help me.
I was thinking to have a binary counter and count up when the signal is given and then when it gets to two days a buzzer goes off
Good approach, check out the CD4521 24 stage binary counter. It has a built-in oscillator, but you can drive it from a 555 if you want. The CD4045, 21 stage binary counter could also be used and may be more available.