Nowadays students are required to answer a set of question in a given time of 15 minutes, 30 minutes or an hour. Hence the circuit describe below can be used [[wysiwyg_imageupload::]]by the student as a clock while they are preparing for the competitive exams.It will give them audio visual sound after the pre set time interval. In our circuit it is 15 minutes hence it will give an alarm after every 15 minutes. The timer could be programmed for other periods as well. By calibrating the variable resistor by some hit and trial method, you can vary the time period. We have also provided a reset switch so that you can reset it when you are required to start it again. The circuit is built around CD4060 and few more components. IC CD4060 is 14 stage ripple carry binary counter, divider and an oscillator.