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.
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.
Figure 1 block diagram inside CD4017-IC
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.
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