Clock pin (pin14) – Whenever pin 14 goes high it will provide you the output. Now after every third output it will automatically starts counting from zero.ī. Like you want the counter to count up to third output then connect the fourth output to pin 15. Reset pin (pin 15) – It is used to reset the counter to zero. It has 3 input pin and 10 output pin and one is ground pin and another is used for power supply and one is Carry out pin. In order to understand the working of IC one must know about its individual pin. It is the most popular IC and extremely useful in various project like Light Chaser, Matrix Die. It take clock signal from the clock input and turn on the 10 output in sequence, each time when it receives clock input pulses. The frequency of oscillation of 555 timer can be calculated by-į=1.44/ (R1+2*(R2)*C1) and CD4017 is a CMOS counter/ divider IC. You can vary the speed of oscillation with the help of R2. In this circuit NE555 a-stable generates a clockįor the Circuit, which provide a oscillating wave to the output pin 3 of IC1. This simple circuit is based on two IC’s namely NE555 timer and CD4017 with few more discrete components.ĥ55 timer IC wired as an a-stable oscillator. 1: Prototype of Clock with LED Pendulum with Tick Tock sound Circuit on Breadboard So you can make your own watch in much less price as compared to market.įig. In this circuit, LED’s are arranged such that you will get time in the form of a pendulum first in one direction than in opposite direction. The circuit described here produces a tick tock sound and also indicate the time with the help of LED. Many of us see different kinds of wall clock available in market which produces sound but they are very expensive.
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