When we build the 10 LEDs running light for a hobby. Often use IC 4017 CMOS-IC. This really neat chip contains a counter and a decoder circuit, that can show a single output pin for each count from 0 to 9.
Do not just look at it. You should learn with doing many circuits using 4017. Below!
CD4017 CMOS-Decade counter/divider
And also use to build all kinds of the timer, LED sequencers and controllers circuits.
Look at the Figure below is a block diagram of inside IC 4017.
The IC 4017 counts with 5 D-type flip-flops.
Decoding and control are by 16 inverters and 15 gates.
The importance Pins look at the table below.
The power supply range of 3 volts to 16 volts and Maximum power supply voltage at pin 1 must not much than 18 volts.
2.) Pin 13 has Clock enabled pins to controls the clock.
When it is “0” logic, the clock is enabled and the counter advances one count for each clock pulse.
When “1” logic, the clock input is stopped, and the counter does nothing even when a clock pulse arrives.
3.) Pin 14 is the clock triggers one count.
The clock pulse must be “clean”.
If they are “noisy” the counter may advance two or more times during each clock pulse.
4.) Pin 15 is the reset pin. Normally, it is “0”.
When made “1”, the counter is reset to “0”.
5.) Pins 1-7 and 9-11 are the decoded output pins.
The active count pin goes high and all others remain low.
6.) Pin 12 is Carry output, for the clock input of an additional counter or an external circuit that the count is complete.
For example, basic circuit using IC-4017
10 LED Flashing using IC-4017
This the circuit light led flashing with show of 10 LED. By use integrated number circuit CD4017 perform be Decade Counter/Divider with 10 Decoded Outputs. Which it is integrated digital circuit CMOS then use the power supply about 9VDC. For a signal input continue the circuit can produce general frequency may use IC NE555 all right.
LED Chaser circuit using 555 and 4017
If you would like to learn basic digital, but it is difficult and boring. Let’s try to create a LED chaser circuit. It used in computer games and in many scientific and mathematics applications so is best for a beginner or for kids learn digital, also my son loves them. Continue Reading
Two way 12 LED running lights using 4017
This Two way LED running lights to use for beautiful. Which they are one of 4017 project that uses 12 LED lamps, arranged in 2 rows, each row of 6 LEDs. A green one and a red one, alternatively. use a different color for this. Continue Reading
10 Key Code Lock Switch Circuit
Simple Key code lock switch circuit using IC-4017 digital, uses 10 switch bottom to control output by Relay. No microcontroller so easier and cheaper! Continue Reading
1 Hz Timebase circuit using IC-4017
When we need a standard digital clock 1 Hz. but we have the input signal is square wave form 10 Hz so need to reduct it lower with digital frequency divider circuit 10 times
I suggest that IC 4017 (Decade Counter / Divider with 10 Decoded)
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