Re: 555 timer circuit

From: Bill Bowden (wrongaddress_at_att.net)
Date: 12/29/04 

Date: 29 Dec 2004 11:43:50 -0800

burtonfamily@dodo.com.au wrote:
> Hello,I made a simple astable 555 timer circuit the same as the one
on
> the 555 web site,but im having trouble working out the values of the
> two resistors and the capacitor so it will turn on for 3 minuts and
off
> for 5 minuts.Could someone please point me in the right direction as
i
> found the data *** a bit confusing.thankyou in advance

There is a 555 calculator on my site that will work out
times based on components entered. But in operation
the times will be a litte longer due to the capacitor
leakage. Probably get about 10% additional time for 3 minutes
calculated.
http://ourworld.compuserve.com/homepages/Bill_Bowden/555.htm

-Bill