First of all may I give my apologies for ask a very basic question.....I am new to the building of circuits.

What I want to do is build a circuit that runs off a 9 volt battery, has one LED, rocker switch to turn on LED and a timer to turn of LED.

Sorry once again for basic question and will be grateful for any help

Rob

 

I'm not sure what question you are referring to, I see none here...

You could probably use a 555 in a monostable configuration to do this. I'm sure Bill has an example on his blog...

Edit:Bill's Blog

 

Basically I just want to buy/build a circuit that I can turn on the LED and automatically turns off after a set time

 

How much time?

 

Few minutes

 

You can get there with a 555 timer chip designed as a monostable (one-shot).
See post #2.

 

Look into the next topic:
http://forum.allaboutcircuits.com/showthread.php?t=87853

 

Here is a circuit with info on how to get the desired time. If you want the timer to start when you flip the rocker switch, then add a power-on trigger to pin 2 (scroll down the link above).

 

Cheers all for the help