This LED based stop watches circuit can be worked as a clock in this counter will advance after every one second. When you provide power supply it start it’s counting from zero and you can stop the timer any time with the help of switch.In this circuit you can monitor the time from 1 second to 60 minutes. It can be used while cooking or while doing exercise or in laboratories. It can be used by students preparing for competitive exams. Important feature of this circuit is you can switch off the stop watch any time with the help of switch S1 and it will hold that value. Keep on reading to find out how the circuit is assembled and how it is put to use.