Digital Clock

I. INTRODUCTION

In this project, we have built a digital clock with 12 hour count time. The clock runs from 12:00 to 11:59 and then back to 12:00. Our display has six digits, two digits for seconds, two digits for minutes and two for hour. This clock functions through the use of a 6 Volts Battery.

Besides this project can fully function, through which it can provide the exact time of the day including the Ante Meridian (AM) and the Post Meridian (PM).

Aside from that, this project only uses ICs and didn’t involve any programming.

II . PROJECT DESCRIPTION

We were able to conceptualize a project that can display exact and accurate time of the day which also includes the Ante Meridian (AM) and the Post Meridian (PM). Our goal is to design and build a fully functioning Digital Clock. We will be using 6 segment decoder, 5 of it will be used for common cathode (CC) and 1 for Common Anode (CA).

Furthermore, The clock is being operated by a 6 Volts Battery. The project works from the power source which is the Battery to the counter ( Dual 4bit Decade and Binary Counter) passing to the decoder which decodes the signal and then directly go to the display.

Other than this, a few materials have been used to ensure proper functioning of the clock. Below is the list of materials to be used in order to make this project possible:

Description Guide:

[R] = Resistors [IC] = Integrated Circuit

[SL] = Slots [DIS] = Display

[C] = Capacitors [CSL] = Crystal

[S] = Switch [B] = Bridge

[TR] = Trimmer [BATT] = Battery

[D] = Diode

Main Clock Part List

R1 = 2.2Kohm 1/4W 5%

R2......R38 = 470ohm 1/4W 5%

IC1-4 = 74HC390

IC2-3 = 74HC92

IC5-7 = 74HC32

IC6 = 74HC08

IC8 = 74HC04

IC9....IC13 = 4511 or [74LS47]

Q1 = BD139 on Heatsink

SL1....SL5 = 7 pin connector

SL6-7 = 2 pin connector

SL8 = 3 pin connector

Display Part List

R39-40 = 220ohm 1/2W 5%

DIS1-5 = 20 mm Led...