Big Counter (2.75" Display)

2.75" 7-Segment LED Display Counter 0-9 is a project based on cmos technology to operate correctly a 7-Segment LED Display of 6.8 V. The IC 4026 counter chosen is a practical counter operates without decoder, and with help of an IC 555 timer: the project can be completed.

1 2.75" Common cathode 7-Segment LED Display

2 I C 4026 Counter

3 I C 555 Timer

4 16 Pin Socket

5 8 Pin Socket

6 9 cm x 15 cm PCB

7 Electrolytic capacitor of 47 u F

8 10 K resistor

9 5 K potentiometer

10 7 x 470 Ohm resistor

11 9 V Battery snap

12 9 V Battery

Diagram schematic is vital its follow-up so that you can complete the project without any problem.

When installing the LED display, you can also insert the 16 pins socket into the PCB.

Install the resistors of 470 Ohm between the LED display and IC4026.

When inserting on the PCB the 8 pins socket, you can also connect the common cathode display pin to the pins V(-) from IC 4026.

When installing the capacitor and 10 K resistor, you can also complete the common negative from the circuit by connecting the negative terminal from capacitor to pin 1 from IC555 timer and to pin 2 from IC4026. Then, you can connect the positive terminal from capacitor to pin 2 from IC555 timer and to pin 6 from itself. On pin 6 from IC timer also join a terminal from the resistor of 10K to leave free the other terminal of the resistor.

When installing the 5 K pot and making the connections to IC 555 timer, you can also connect the pending terminal from 10 K resistor to pin 7 of the same IC. In this step, you can complete the common positive from the circuit.

For installing the battery snap, you need to take the common positive & negative terminals and connecting them to red & black wire from battery snap respectively.

For completing the project, insert each integrated circuit into its socket and the battery into the battery snap.