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555 timer

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rukid88

New Member
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

Thanx
 

Russlk

New Member
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.
 

rukid88

New Member
Duos any one know the formula for what kind of capacitors and resister I will need for say an hour or two.
Thanx
 
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