Unlike the potentiometer where the two terminals that are connected to the circuit are independent of the slider position, a rheostat has one of its terminals directly connected to the circuit in consideration. Potentiometer change the voltage across any component by adjusting the sliding connector across a uniform resistance material. Related Post: Traffic Light Control Electronic Project using IC 4017 & 555 TimerĪ potentiometer is a three terminal passive electronic device.It is said if the carry over pulse ripples the IC, if it has to correct the working. The function it performs is called given a name. This pulse which is provided at the pin 12 is called carry out signal, hence the pin 12 is also called a carry out pin. So when the sequence of the outputs is completed and the pulse from pin 12 does not complete its cycle, then the next batch of outputs will be halted to match the frequency at which they are supposed to work. To maintain the working of the sequential output properly, there is another pulse that is given to the IC, which completes a cycle in ten cycles of the input clock. The former being the ground and is connected to the negative supply voltage and the latter being the supply voltage to which the supply voltage is applied. This IC has a set of two pins for powering itself. When the reset pin is connected to the ground, the circuit resets itself.

This reset pin is present in pin 15 of the CD4017. There is also a reset pin which stops the ongoing sequence of outputs and starts them over from their initial state. And one thing to note is that the clock will function on the clock highs, which means that the sequential output will change only when this pin encounters a high from the input clock. If there is no clock, it should not be left unconnected it should be connected either to the supply voltage or to the ground, according to the input standard rules of CMOS. As we discussed above, this IC needs a clock according to whose clock cycles there is sequential high and low in the output pins. This clock is the frequency provider for the working of this IC. Related Post: Automatic LED Emergency Light Circuit Making the enable pin high will make the IC ignore the clock input it is getting. The IC switches off when the enable pin is made high. The IC will work as long as the enable pin in the IC is active low. The six other pins for the IC will be described below. These pins are used for controlling the IC directly. There are six other pins excluding the output pins. They then continue to repeat the process after the ninth output is reached. The input that comes from a timer IC will provide the timing at which the consecutive output should become high. This is the order in which they turn high one after another. Each of these 10 output pins are marked in an order. There are 10 output pins, which are from 1 to 7 and 9 to 11. The pinout for the CD4017 IC is given below.Īs we can see in the above picture, there are 16 pins in this IC.

It has a very high clock speed, about 5 MHz.

It works well with Transistor-transistor logic.

It has a range of supply voltages, it ranges from 3 to 15V.

Even though the IC does not have a high range, but it still has got some pretty unique features. This IC is generally used for low range counting. This IC is also called a Johnson 10 stage counter in honour of the inventor of this IC. As its name suggests, this IC can count from 0 to 10. There are many ways as to which a counter can be made. This IC is a CMOS decade counter, which means that this IC primarily uses CMOS as its base to function. The Decade counter IC CD4017 is the best fit for this application. The circuit in consideration has a requirement for a timer since the LEDs in the circuit are meant to repeat the flashing in a period manner. Related Post: Clap Switch Circuit Using IC 555 Timer & Without Timer Decade Counter IC 4017

In astable mode, the circuit of the IC produces a continuous pulse with exact frequency based on the value of the two resistors and capacitors which are connected in the external circuit.

In monostable mode, the circuit generates only single pulse when the timer gets an indication from input of the trigger button.

The output signals of low and high states signals are controlled by reset and activating the input pins.

In bistable mode, the circuit produces 2-stable state signals that are in low and high states.There are three modes of operation of the Timer IC, which are bistable, Monostable and astable mode. Open collector output to discharge capacitor Provides access to the internal voltage dividerĪcts as the threshold as to when to stop the timing interval Is driven to ~1.7V below Vcc or to ground

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