Saturday, July 24, 2010

1-10 Minute Adjustable Timer using 555 IC

This project uses 555 timer  IC in monostable mode. The circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds.

The time period is set by adjusting the variable resistor. It can be adjusted from 1 to 10 minutes (approximately) with the parts shown in the diagram. You can mark the times on a scale drawn on the box.


 Source: http://www.kpsec.freeuk.com/projects/timer.htm




4 comments:

rajmangal said...

Your post really helped me to understand this.Its really a good post. Thanks for spreading this information here..
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arnel said...

sir where do i put the no,5 in the 555 IC because i dont know what is the function of no. 5 pin can you plss reply ASAP :D because i have a project in circuit tnx

Bezaleljm said...

Thanks for the post, it has helped me to understand 555, please help me understand, how long does the timer stay off?

DANISH said...

I need a adjustable timer with display the time spending

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