They are used to improve the readability of the digits. Pins 3 & 4 are the ripple blanking input & output pins. Pin 2 is the Clock Inhibit pin and should be grounded while the counter is incremented by one value for each pulse. The output of CD 4033 is displayed by the seven segment LED display LT543. For each pulse the out put of CD 4033 advances by one count. IC NE 555 is wired as an astable multivibrator for triggering the CD4033 IC on Clock Input Pin (Pin 1). While using the IC make sure that you use it alternatively, as it is highly sensitive to static change, and a small touch at the input terminal would be more than enough to start the counter circuit. This IC can be operated at a maximum of 20 Volts. You may also like: Wireless Mains Voltage Tester Using IC CD4033 This IC can be used in display circuits and also in clocks, timers and so on.

Thus, the input signal will be converted to numeric digits and will be displayed on the LT543 display. The decoder helps in converting the Johnson codeto a 7 segment decoded output.

The IC CD40333 is a 5 stage Johnson decade counter with decoder and is mostly used in digital displays. In this circuit a 7-segment display is connected with two NE555 IC’s and CD4033 IC to display counts from 0 to 9.

This circuit can be used in conjunction with various circuits where a counter to display the progress adds some more attraction. Here is the circuit diagram of a seven segment counter based on the counter IC CD 4033. Seven Segment Counter Display Circuit Description

Icircuit clock