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flashing LED timer off chip.

Forums: Led Timer, Electronics
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Domenic p
 
Reply Fri 26 Sep, 2014 02:49 am
I would like to find out if it is possible to design a 9 volt circuit that when a small micro switch is switched on, 2 small red and blue LED's flash for a short time and then time out. The only thing is that the micro switch will still be in the on position.

Kind regards Domenic from Perth WA.


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Type: Question • Score: 2 • Views: 1,483 • Replies: 4
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timur
 
  2  
Reply Fri 26 Sep, 2014 08:10 am
@Domenic p,
Well, it's called a one shot timer.

http://teachmetomake.com/wordpress/wp-content/uploads/2013/10/oneShot.jpg
Quote:
This circuit uses the popular 555 timer in a monostable configuration. The output (LED in this example) is normally off, until the switch is closed momentarily. The LED stays on for about 1 second, regardless of whether the switch is let go or not. After being on for a second, the LED will not light again until the switch is opened and closed again.

R3 and C2 determine the length of time the LED is on. The on time T(on) is:

T(on) = 1.1 * R3 * C2
dalehileman
 
  1  
Reply Fri 26 Sep, 2014 01:13 pm
@timur,
Wow Tim gotta give ya credit for than'n

As a former ham, inventor and electronics writer, without revealing anything revealing I wonder if you might reveal a bit of your background
timur
 
  1  
Reply Fri 26 Sep, 2014 01:28 pm
@dalehileman,
What good would it do?
dalehileman
 
  1  
Reply Fri 26 Sep, 2014 03:58 pm
@timur,
Quote:
What good would it do?
Satisfy curiosity Tim, at least mine

Then we might chat
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