# Active Low Decoder (BCD Decimal)

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## Introduction: Active Low Decoder (BCD Decimal)

Hello! Instructables

Welcome to my active low decoder (BCD Decimal) project. It's a topic of Digital And Logic Design by Morris Mano (fifth edition).

I just build it as a hardware.

## Step 1: Basics

Before starting this project you'll need to know how its work. So with the help of this picture you can understand easily what i mean actually if you didn't understand yet no problem at the last step i uploaded a small video about active low decoder.

Let's get started.

## Step 2: Circuit Diagram

Here it is the circuit diagram of active low decoder.

## Step 3: Parts

You'll need

Vero board

IC's: 74ls42 with base and LM7805 (regulator)

Resistors: 330ohm x 10, 1k x 5

Leds: green x 10 and red

Switches: spst x 9 (4 spst is optional)

9 volt battery with connector

## Step 4: Component Placing

Place the components on vero board according to circuit diagram then soldering it.

## Step 5: Soldering

After soldering and connecting jumper wires its look like this.

## Step 6: Complete

Now Active low decoder (BCD decimal) is ready to use. In next step a small review about active low decoder in a video is clear your concepts.

I hope you like my DLD active low decoder project.

## Step 7: Active Low Decoder (video)

Thanks for watching.

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## Questions

Good Job Tanks :)

I wrote a conversion program to the bases Decimal, Binary, Hexadecimal 32 BIT.

the program that was written in Delphi also displays time in binary it runs on Windows.

http://delphi.developpez.com/telecharger/detail/id/3789/Conversion-DBH-conversion-d-un-nombre-dans-les-3-bases-Decimale-Binaire-Hexdecimale-en-32-Bits

as the program is in French, Here is the translation of the aid:

DBH_Conv That is a program converts a number of 32Bit Within three number bases:

decimal

binary

aussi it displays a small binary clock

French to English program displayed:

Number of Entree's Translate ==> Enter the Number to be Translate

Translation into three bases ==> 3 Bases Conversion

Help ==> Help

Using:

Enter the number to put into one of three bases (Decimal, Hexadecimal, Binary) in the white box

Then click the button That base D, B or H

the result is displayed in the two --other base

I remember making something like this in my digital design class a few years back. So much fun!