Counter digital electronics

1. Made by :
TOPIC : EVENT COUNTER (OEP)
SUB : DIGITAL ELECTRONIC

2. Simple 4026 Manual Digital Counter
Circuit with Reset and Pause
 In our normal practical life, we may face circumstances
where we need a digital event counter in order to count
certain events. Here I will give you some examples: people
counter circuit in an auditorium, to count the number of
products in a godown, to calculate an athlete’s performance
and above all, all the digital clocks are basically counter
circuits which generates an one second clock. Here we are
providing similar kind of counter circuit diagram.

4.  In this led 7 segment display counter circuit we are using a
single digital counter IC (4026) both as counter and 7
segment driver. A common cathode 7 segment display is used
here. The IC used here requires only clock pulses for
operation.
 By increasing the number of ICs and seven segment displays
you can extend the counting limit up to infinity. This can also
be made into a digital frequency counter circuit.

6. Components Required
 IC 4026
 7 segment display
 Resistor 220 Ohm
 9V power supply

8. Working of Digital Counter Circuit
 IC 4026 is basically a decade counter (10 States – counts 0
through 9). Also it has an inbuilt 7 segment display driver
which makes interfacing of 7 segment display easily.
 4026 drives only common cathode seven segment displays.
As the name indicating a common cathode seven segment
display has its cathode shorted and grounded.

10.  Pin 1 is the Clock input and Pin 2 is the clock inhibit which is used for
disabling the clock. It can be used to pause the counting when desired.
 Pin 15 (Master reset pin) helps to reset the counter. Pin 2 and 15 are active
high, so we are grounding them to enable the counting process. They
should be connected to Vcc for their respective actions.
 Pin 3 is display enable pin which enables the display.
 Pin 5 is the carry output pin which generates a carry each time the count
exceeds 9. It is used for extending the counting limit by connecting to the
next IC’s clock pin.
 You can use a 555 astable multivibrator as clock input. To know more
about the basic working of a 555 timer astable read Astable Multivibrator
using 555 timer.
 For 2 digit display digital counter circuit 0 to 99 connect the carry out of
the first IC as the clock of 2nd IC as seen below. You can increase the
digits as much as you want by repeating the process with more ICs and
displays.

12.  Resistor R1 is used as current limiting resistor. You can vary
the brightness of the display by varying the resistance value.
But this brightness will not uniform for each digit, Uniform
brightness can be attained by connecting individual resistors
for each anode segment.