3 to 8 decoder circuit diagram. 3 to 8 decoder truth table

Circuit Design of 3 to 8 Decoder Circuit using AND, OR, NOT Gate ICs and Seven Segment Display. 

The Decoder Circuit is a very useful circuit of Digital Electronics. It is a Combinational Logic Circuits. These circuits are used to decode the data into a signal. These circuits are also used to run Seven-segment displays.
In this post, we will see the circuit of 3 to 8 decoders using AND, OR, NOT Gate ICs and a seven-segment display.

                              You can make a 3 to 8 decoder circuit using only a single IC which is already available in the market. But for understanding the basics of 3 to 8 decoder circuits, and how a 3 to 8 decoder circuits work, these circuits which are shown below are very important.
The below circuits are made by the basic logic gates i.e. AND Gate, NOT Gate, OR gate.

The simple 3 to 8 Decoder circuit using NOT Gate, AND Gate and LEDs:  

This is a very simple circuit. According to your inputs, only one LED will be glow at a time. you can make this circuit in your school projects. See the circuit carefully and make the circuit. The wires are indicated by different colors to easily understand the circuit.

Click on the below image to view the original.

After making the circuit connect Vcc and GND to the 5V DC supply and start giving the inputs. If your LEDs have a very low current rating, you can connect the resistor in series with the LED.

According to the above circuit diagram, the table of Inputs and LEDs is given below.

Circuit Design of 3 to 8 Decoder Circuit using AND, OR, NOT Gate ICs and Seven Segment Display:

Now, Let's make the circuit 3 to 8 Decoder Circuit using AND, OR, NOT Gate ICs and Seven Segment Display. This Circuit is very complicated as here uses only the basic logic gates. See the circuit carefully and make the circuit.

Click on the below image to view original.

The Seven Segment display has ten terminals. Five terminals at the top side and five terminals at the bottom side. At first, check the Display and mark every(a,b,c,d,e,f,g) terminal as per the circuit diagram. The a,b,c,d,e,f,g terminals are very important and it must be connected correctly as per the circuit diagram. After making the circuit diagram connect Vcc and GND to the 5V DC supply and start giving the inputs. As it is a 3 to 8 Decoder circuit, you can see the number 0 to 7 on the seven-segment display.

Read Also:

• BCD to Seven Segment Display Decoder Circuit using IC 7447
• 2-Digit, 3-Digit, and 4-Digit(12 Pin) 7-Segment Display Pinout
• 7-Segment Display Circuit Diagram
• 7-Segment Display Connection Procedure (Common Anode & Common Cathode)
• What are Decoders? Block Diagram, Truth Table, Types
• Half Adder and Full Adder Circuit Diagram, Truth Table
• Difference Between Combinational and Sequential Circuit

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