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help!!!

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qyc88

New Member
could anyone help me create a timing circuit which:
.... has a capability of timing from 30 minutes to 2hours
.... using two 555 ic to create one ic for the main timing and the other for changing the time a LED stays working for and pulse speed of it

thanx :) [/img]
 

panic mode

Well-Known Member
It is hard to get any kind of accuracy for long periods
using only timer chip. I would recommend using counter(s) to
achive long times. Check the datasheet for 4020

https://fenix.student.utwente.nl/~fenix/datasheets_4000.html

It's 14-bit counter (divide by 16384).
Half an hour is 30*60=1800 seconds (16384/1800=9.1Hz).
Two hours is 2*60*60=7200 seconds (16384/7200=2.2Hz).

So all it takes is to make adjustable oscillator that would cover
range 2-10Hz (maybe flash LED as well so you can easy tell the
difference).
 

mozikluv

New Member
timer

:D

you can also try CD4536 and you can also use the site cited by panic mode :D :D
 
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