Making an Oscillator Bomb with a 555 for Left4Dead

[Tesladude]

Hi i use the 555 a lot and I am also a gamer.
in the game "left4dead" they have a bomb that has an occilator to tell you when the bomb is going to go off bu blinking slowly at first, like 1hz then slowely increasing frequency up to maybe 10hz over somthing like a 10 second span. Does anyone know how to do this with a 555?

Example

 

[NascentOxygen]

Hi i use the 555 a lot and I am also a gamer.
in the game "left4dead" they have a bomb that has an occilator to tell you when the bomb is going to go off bu blinking slowly at first, like 1hz then slowely increasing frequency up to maybe 10hz over somthing like a 10 second span. Does anyone know how to do this with a 555?

I don't have data to expend on a YouTube video ATM, but do you want the duty cycle fixed at about 50%, even at 1Hz?

 

[Tesladude]

wait, ok i completely forgot something.
I was messing around with the 555 trying to acomplish what I want but I have little or no Idea what the duty cycle is. I FEEL SO STUPID! lol is that saying the frequency will increase by 50% every 1 second or somthing?

 

[NascentOxygen]

Duty cycle is the proportion of each cycle that the LED is lit. 50% duty cycle means it spends equal time ON as OFF.

 

[pantaz]

The 555 chip is extremely popular. There are numerous "how to" pages, such as...

Here's a good little overview of the 555:
http://english.cxem.net/beginner/beginner1.php

This page calculates component values given frequency and duty cycle:
http://www.changpuak.ch/electronics/calc_05.php

 

[Tesladude]

ok thanks guys