This circuit starts timing when switched on. A green LED lights to show that timing is in progress. When the time period is over the green LED turns off, a red LED turns on and a bleeper sounds. The time period is set by a variable resistor and it can be adjusted from 1 to 10 minutes (approximately). It could be used to set a time limit when playing games or as an egg-timer in the kitchen.
Read more at : http://www.kpsec.freeuk.com/projects/timer.htm
Read more at : http://www.kpsec.freeuk.com/projects/timer.htm
Please update the link to www.electronicsclub.info/p_timer.htm
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