Running a 555 timer?
I'm wondering if anyone can explain something to me: When I run the program in astable mode, the duty cycle must be above 50%. I want to power an LED that flashes very briefly, but has a relatively large interval of being off until if flashes again. Something more along the lines of a duty cycle of maybe 5%-20%.
First, could you explain why the program constrains the value like this? Is it because the 555 can't run at a duty cycle that isn't greater than 50%? If that is the case, why can't it?
Second, if I can't run it like that, what would you propose I do to power the LED in the manner I described?
btw, if you want the program follow this link: http://clarkson-uk.com/555-timer/
It's actually a pretty cool program! :D