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THE 4017B DECADE COUNTER | |
V. Ryan © 2005 - 2022 | |
PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET BASED ON THE EXERCISE BELOW |
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The 4017B is an integrated circuit which has been designed to count pulses. It has 16 pins and looks like any other 16 pin integrated circuit. |
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They can be used in timing circuits and are often used to switch on and
off LEDs or motors or other circuits. They are versatile and relatively
simple to put together. Counters such as the 4017B are cheap and yet
surprisingly useful.
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A good example is seen below. A 555 astable circuit is used to pulse the 4017B at regular intervals. The pulse from the 555 IC is generated from pin 3. In the circuit seen below, pin 3 of the 555 IC feeds into pin 14 of the 4017B (called ‘clock in’). When this occurs pin ‘A’ of the 4017B emits current, lighting its LED. The next pulse from the 555 IC results in pin ‘B’ of the 4018B IC emitting current and lighting its LED. | |
Continuous pulsing by the 555 IC results the LEDs of the 4017B turning
on and off in sequence, creating a ripple effect. |
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The wires from the battery snap and also the ones
from the toggle switch are fed through small holes in the PCB. This
ensures that they cannot be accidentally pulled off the circuit easily. |
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Below is a 'manually operated 4017B circuit. Note: each time SW3 is pressed the next LED illuminates. SW2 is the reset switch. | |
FURTHER DETAIL - CIRCUIT DIAGRAMS - 4017B | |
QUESTIONS: 1. Build a 4017B Decade Counter using either a breadboard and components OR simulation software such as Crocodile Technology. Add a 555 timer to pulse the decade counter. |
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