Digital Electronic project: "4-BIT ADDER/substractor"

Hooooolaaaa My steemit friends!! Here I am again. Today I'll show you one my digital electronic projects, This is a 4-BIT complete adder that sums and substracts binary numbers.

Components

• 7486 (XOR GATE)
• 7483 (COMPLETE ADDER GATE)
• Wires
• Resistors
• Diodes LED
• Voltage Source (5V)
• Multimeter (Optional)

Diagram Connection

First of all I use to make what I call in this case a "Logic Diagram connection" in order to place every single component in the correct way, in this way I don't lose time, everything turns easier and I don't destroy my components doing a bad connection :(

Logic Connection Drawing

Here you have the main diagram, based on this one you can make the connection diagram showed before.

Here you can see the 4-BIT adder process.

Proccess

To sum 2 binary numbers you put each one in each pin, here you got A and B. You can see I put 1 in B, 0 in C (Carry) and 1 in A. If you sum 1 + 1 in binary it shows you 1 0, 1 goes to the Carry output and 0 goes to the "normal" output. (Picture)

To this circuit to work you first need to put 2 binary numbers, one in each gate. I called A1,A2,A3,A4 my binary number inputs in each one of the gates.

You see they actually have B1,B2,B3,B4 inputs aswell, talking about the 7486 they will be a condition, If you put 0 you SUM, if you put 1 you SUBSTRACT

Talking about this binary system when I talk about 1 and 0 I'm talking about the voltage that you put in each pin, for example, 5V means 1 logic, and 0V means 0 logic.

Here you have a descriptive image:

Diodes LED represent this positions in the circuit. (Here's a video about this project)

I mentioned about A1,A2,A3,A4 but what happens with B and Y?

Simple: the 7486 gate have 4 integred gates, each one have 2 inputs and 1 output, In this case I called An and Bn its inputs and Yn its outputs, these outputs goes to the Bn inputs of the 7483 gate.

The 7483 gate has 4 integred complete adders, It means 4 "little" squares like that I showed before, so you can see that you are adding number by number and It makes the hard work.

The 7483's outputs Called Sn goes to Diodes LED to represent a binary number. They are in a convenient position to show us each BIT position.

Before the diode LED goes a resistor that limits the current to the diode, in this way It works and don't destroy itself.

I used 300 OHM resistors, they gave me 16,66 mA enough to light the LED. I used 3mm LED, and they normally work with 20 mA, so the best resistor to use here is 250 OHM.

Also a PROTEUS SIMULATOR picture:

Thanks

Thanks a lot to you my appreaciate reader for reading my post, I hope you liked it and enjoyed it :) I'm really making my effort to give you my best! Have a great day, take care, and see you soon! Bye-Bye.