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The segment associated with U2 will count up to 9 before returning to 0. Then it starts displaying the value 1 in its segment.Ĭircuits Library - 220+ practical circuits So thus when U1 segment counts up to 9 CO signal will sent out to U2.
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This will the clock input to the next IC U2. When the count reaches the maximum value of 9 a high signal was sent out through the pin 5 CO of U1. With each incoming pulse in to the CLK pin of this IC ,the counter increments by one which in turn gets decoded and displays the value in 7 segment accordingly. The 1Hz clock from oscillator is fed into CLK pin of U1. Use switch START/STOP to start and stop counting of Stopwatch.įour IC 4026 (Decade counter with decoder which converts counter values to 7 segment outputs) was used to drive each of the 7 segment displays. Switch “ON/OFF” used to turn the counter ON or OFF. The 7 segments marked as “S” for seconds and “M” for displaying minutes in the above circuit diagram. The display block uses 4 common cathode 7 segment for displaying the seconds and minutes of the count.
#PENGGANTI IC 4017 GENERATOR#
You can always use other 1Hz clock generator circuits rather than the crystal oscillators provided your application have some tolerance on the accuracy. We are not going to discuss the oscillator section briefly in this article since this 1 Hz oscillator circuit will do a pretty good job for our DIY stopwatch project. The deviation of output might not be that big but its good to have it under consideration.Ĭrystal powered oscillator will be the perfect solution for this problem. Even a simple 555 timer can be used here, but temperature drift might affect the accuracy of output. There are plenty of ways to do this but each method might differ in accuracy of output wave produced. The oscillator should provide an output clock frequency of about 1Hz. Oscillator provides the clock source for stopwatch we are about to build. Even though using an MCU will be a lot better option still this project will be a great DIY for those who love to play with Digital chips. The most highlighting feature about this project is the fact that it doesn’t use any MCU to do the job.
#PENGGANTI IC 4017 HOW TO#
Today we are about to see how to build a DIY stopwatch just using Digital IC’s 40.