Hello! friends

Welcome to my another Adder and Subtractor project. It's a topic of Digital And Logic Design by Morris Mano (fifth edition) with the help of this you'll know how its work in reality.

So let's get started.

## Step 1: Circuit Diagram

With the help of this diagram we build our Adder/Subtractor project.

## Step 2: Materials

You'll need

Some pieces of wire

Soldering wire and solder

Vero board

Resistors: (330ohms x 13) and 1k

Ic's: lm7805, 74ls86 and 74ls38 with bases

Switches: spst x 9 and dpst x 1

Led's: red x 9 and yellow x 5

## Step 3: Component Placing

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

## Step 4: Soldering and Jumper Wires

Here it is the soldering and jumper wires.

## Step 5: Finish

After its look like this.

## Step 6: Examples

When you push the switch on left side then its work as a adder and on left side as a subtractor you can see on image. I uploaded a video on next step i'm sure it will clear your concept.

## Step 7: Video

Thanks for watching.

I hope you guys like it.

<p>great project</p><p>can i place your project on my website.</p><p>i'm working on a website which is related to electrical projects.</p><p>i also mention your name.</p><p>plz reply</p>
okay sure<br>
<p>The 74ls38 have only 14pin.What is ic??????? </p>
<p>circuit diagram is not clear,upload a clear image of it soon</p>
<p>k let me clear you just focus on a diagram lets get started with upper 4 led's (A0, A1, A2 and A3) will be connected with 74ls38</p><p>A0 is connecting with the pin 10 of (74ls38) </p><p>A1 is connecting with the pin 8 of (74ls38)</p><p>A2 is connecting with the pin 3 of (74ls38)</p><p>A3 is connecting with the pin 1 of (74ls38)</p><p>lower 4 led's (B0, B1,B2 and B3) will be connected with 74ls86</p><p>B0 is connecting with the pin 2 of (74ls86)</p><p>B1 is connecting with the pin 5 of (74ls86)</p><p>B2 is connecting with the pin 10 of (74ls86)</p><p>B3 is connecting with the pin 14 of (74ls86)</p><p>now let's talk about the jumper who's connected with IC to IC</p><p>(74ls86) pin no 6 connected with (74ls38) pin no 7</p><p>(74ls86) pin no 11 connected with (74ls38) pin no 16</p><p>(74ls86) pin no 13 and (74ls38) pin no 5 connected with +ve terminal of 9 volt battery and other connections are shown in a diagram clearly.</p><p>I hope it will help you.</p>
<p><a href="https://www.instructables.com/member/AyaanS1/" rel="nofollow" style="">AyaanS1</a> it will cleared your concept </p>
<p><a href="https://www.instructables.com/member/AyaanS1/" rel="nofollow" style="">AyaanS1</a> bro i'll send you later when i'm free. In mean while try to understand.</p>
<p>good day sir. i just would like to ask how to connect the circuit into the ic 74ls38, which has 14pins because in your finish project or circuit it has a 16pin 74ls38. i am just a newbie sir with digital electronics and i want to build this one,,, so please could you help me sir. thank you sir.</p>
<p><a href="https://www.instructables.com/member/alcantara97/" rel="nofollow" style="">alcantara97</a> i'll give you a suggestion you just buy these two ic's 74ls86 and 74ls38 and build the same one.</p>
Try a 74ls381.
<p>Hmmm it's good idea <a href="https://www.instructables.com/member/peabody1929/" rel="nofollow" style="">peabody1929</a></p>
Thanks. Great idea! Keep it UP!<br>
<p>thanks <a href="https://www.instructables.com/member/Paulosutty+/" rel="nofollow" style="">Paulosutty</a></p>
Great idea! Electronic enthusiasts
<p>thanks <a href="https://www.instructables.com/member/Gugoo/" rel="nofollow" style="">Gugoo</a></p>
Is it easy to use bread board?<br>
i think so .but...a bit burdensome.
<p><a href="https://www.instructables.com/member/Paulosutty+/" rel="nofollow" style="">Paulosutty</a> of course</p>
This is a cool project, but it's a little hard to follow the wiring diagram/soldering board layout. I would put it into Fritzing or 123d circuits and share the link.
<p><a href="https://www.instructables.com/member/AlexFW/" rel="nofollow" style="">AlexFW</a> follow the circuit diagram it's not difficult. If you having in trouble don't worry i'm ready to help you.</p>
<p>Yeah <a href="https://www.instructables.com/member/AlexFW/" rel="nofollow" style="">AlexFW</a></p><p>It's not so difficult i attempted on my first try trust me.</p>