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:
Your post really helped me to understand this.Its really a good post. Thanks for spreading this information here..
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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
Thanks for the post, it has helped me to understand 555, please help me understand, how long does the timer stay off?
I need a adjustable timer with display the time spending
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