Tutorial | Using the 7447 74HC47 BCD to 7 Segment Display Decoder

[@ala49213]

I'm deeply appreciative to you!!! I searched videos of 7447 all day but I had never seen anyone perfect explanation like you.

[@HamBaconHamilton]

This is the video that i wanted, the shop owner said that the other ics on other vids are sold out and only left this. Best Video! Now i can continue on my project.

[@kevinpizzolato86]

The best video on driving a 7 segment display that I've seen. Great Job!

[@Wes8761]

Great video. Thank you.

[@faranahmadk7401]

crystal clear.

[@airthrow]

Super clear the way you hooked everything up, thanks!

[@boff2014]

Thank u so much Man,best explanation.

[@ramakrishnanavudaiappan8211]

On what basis did u chose the resistor values? What is the minimum amount of current that can damage the 7 segment display?

[@animeeditzz1145]

Why are we using 470 ohm resistors for 7 segment i have also seen other videos they arent using it

[@pratiksalunkhe332]

Thanks it works 👍

[@walidmoghrabi9022]

Hello, can you do the same exact circuit in this video using Proteus? I tried it but the 7447 bcd and 7 segment display are different om Proteus so it isn't working. Thank you in advance

[@quangminhinh6734]

thank you very much. That is great

[@alikhorcheni5982]

Good work. Thanks

[@edgardoignacio7232]

Are the resistors 1/4 watts ??

[@emanueledifranco7765]

Very nice video

[@nadaawad9828]

Fantastic ❤️

[@yoshkyu1134]

Hi may I ask why is my display not changing . Like it's stock in number 8. Is it possible that the problem is in my switch?

[@yoshkyu1134]

and also it suppose to start with 0 right? hope you can help me

[@AkbarKhan-gd2bw]

@@yoshkyu1134 brother I am currently in the same situation, can you please give me any suggestion on how to make it work ?

[@nithudey9221]

How to calculate the value of the resistance ?

[@TrystansWorkbench]

You calculate resistor values for LEDs by assuming a typical LED current of 20mA (0.02A). You know the supply voltage (5V). So Ohms Law, Resistance = Voltage / Current. So Resistance is 5 / 0.02 which is 250 ohms,. Use the nearest standard value - so 220 ohms.

[@motivational-838]

Can i use a 330 ohm resitor instead of 470 ohm resistor and not use the 1k resistor and use 5v supply

[@ec-067nikithakondi9]

What type of jumpers wires are used??

[@noelvinas6759]

can you post a design of 4 input 7 segment decoder using diode-transistor logic ?

[@mohammedalqudwa3345]

how i can make 7 segment led display 0 where switch is over 9 like (8+2 = 0 or 8+4 =0 or 1+2+4+8 = 0 ) any thing over 9 let 7segment show zero

[@brelectronic1298]

Thanks

[@poalatenorio]

Someone's playing Mobile Legends at 0:13 hahahaha lol

[@utlayy8237]

Can you please show it in schematic

[@Proto61]

I did everything like in dmthe video, but it shows only the middle line (minus)

[@_Rajkishor_Thakur]

Can I connect common anode through a 470 r resistor to 5v insted of connecting cathode of all segments with 470r resistor

[@QRobotix]

Yup as long as your current output is < 20mA for each segment

[@johnson554671]

Good point, other tutorials show with the one resistor. Helps to save space on the breadboard.

[@26avishkarbhoir85]

@@QRobotix bro can I take 8 way deep switch or can I make without using switch please reply fast

[@-_l-_-l_-]

Hi awesome video but I just want to know what the 1k resistors are for?

[@QRobotix]

Hi I explained it somewhere in the comments below

[@JarppaGuru]

first think circuit without resistor you switch slider and + connected - directly DOH! that we call short circuit resistor is pulldown input down when switch not used and pull it up when used bcoz there one resistor voltage become on that side is positive if use just + switch -> input. yeah it work perfectly on position, but when you switch off input not go anywhere pin is floating. it can be 0 or 1 we not know and we want it be 0 then. thats why resistor is there pull it down. hope helps xD

[@Aniik]

Can you reupload the schematic? Your link isn't working

[@90sTVWorld]

Can u post the design of digital calculator?

[@user-vi5nf3ux1q]

why you connect two common together? is one common enough ?

[@elliotalderson-vj1xf]

Can I use 9 volt battery instead of 6 volt power supply

[@miracle4713]

can i use decoder if i need to output somethings other than 0-9? or just can control manually using switch?

[@riyanshiarora8412]

The circuit is not available using that link. It is showing some error

[@ahmedismail3137]

how to connect this in proteus by decoder and the distribution of numbers ?

[@shreyasbr3359]

Which type of power supply we should use

[@xhrychmalate1090]

Is 74LS47 and 74HC47 IC still the same?

[@esvinhernandez6043]

Yes!

[@moezbenjred9226]

if I used different resistors will it work?

[@user-jl5zs5eb9d]

me salvaste grasias

[@migueljaballas81]

can I use this with a 3x4 keypad?

[@pradyumnapnadgir9903]

How to connect 7 segment display using 74147 chip and 7447 chip can u do it please...

[@timomigchielsen201]

Hey, how would I do this with 3 7 segment display decoders?

[@QRobotix]

What do you mean?

[@mrosos7308]

will it work with a 7 volt battery?

[@johnandriesibugan8883]

Hi my 7447 bcd has only 15 pin? is it okay?

[@deepannandy7288]

I haven't found the dip switches anywhere on the market. Can I use 4 3-pin slider switches for inputs?

[@quantum.codex42]

Yes

[@giannezylasdelacruz7570]

Hi! The datasheet and schematic cant be opened anymore, it says error 404

[@yasmienabdelaziz6630]

Please can you tell me how to represent A B C D E in the 7 segment display?

[@QRobotix]

If you want to use logic gates then you have to use the Kmap method to design the logic

[@yasmienabdelaziz6630]

I want to display them using 7474 decoder But there is a problem When we use it the output gives don't cares after number 9 and We want to represent The rest of the hexadecimal number What can we do?

[@user-mo6hn9ti1e]

Tried this and didn't work

[@pratiksalunkhe332]

What goes wrong

[@user-nc4lh2fm8r]

how can we connect common cathode?

[@azimalif266]

Is there a binary coded hexadecimal decoder ic?

[@StoriesUniq]

Can you post the design of this circuit

[@QRobotix]

Hi schematics can be found in the description field.

[@26avishkarbhoir85]

@@QRobotix please reply

[@QRobotix]

@@26avishkarbhoir85 hi it's in the description

[@razanadeem8373]

Love u man.Is really helpful

[@sanjayprasad7774]

thanku sir

[@Khushigowda2506]

What is that supply material u given? Cn anyone tell me

[@ninikagustin1772]

Hi, i follow your instruction, but why ic 7447 doesnt work? Shoud i replace the resistor?

[@QRobotix]

🤷‍♂️

[@adamnuh8600]

Hey !!!! Could u add a buzzer and LED ?

[@neshadhasan596]

would please show the how to use two 7 segment display to get output 15 , in binary 1111

[@giftmabaso1698]

Can you show me a code that you have programed your pic with

[@samuelrohangundra3891]

is it okay to use a 9v supply?

[@salmamostafa9402]

Can I use less than 470 ohm resistor?

[@sepht9680]

is it okay to use a 9V battery supply? also, will this display the no. 9?

[@QRobotix]

Hi the 9v question is answered recently in the comments and yes it displays 0-9.

[@sepht9680]

@@QRobotix thanks a lot!! great video, too!

[@sfhgdshj6944]

I’m using a Cd4055 decoder I’m so confused on how to connect it to the 7 segment display

[@QRobotix]

Have you looked at the datasheet? CD4055B has similar pin assignments to the 7447.

[@reynorarnedcarreon698]

Can you use 9v batt here?

[@RainbowPlayzo]

Hey I have a dip switch that has 5 switch, will it work tho if I use only 4 switch and leave the 5?

[@QRobotix]

Yes

[@anggaalpitarahman3779]

the input voltage is how many volts???

[@esvinhernandez6043]

It can be from 5 to 15 v

[@omerbinaziz8364]

Can i please get the logic diagram of this?

[@90sTVWorld]

Why did you use 1k ohm and 470ohm only??

[@QRobotix]

It depends on the power source you use. For standard LEDs you want to limit its current to 20 mA do 470 ohm works well. And 1kohm is a good choice for pull up or pull down resistors.

[@kencasil8562]

do you have a schematic diagram?

[@a.vignesh8888]

Friend please explain why do you add particular resistor value and I need basic things about electronics do you help me

[@QRobotix]

Hi which resistors?

[@zerosandones7547]

the outputs are only 0-9? not 0-F?

[@omnaik1747]

Its battery is 6v and what ampere?

[@jeffnay6502]

I have this hooked up to a 4x4 matrix keypad and a 74C922 keypad decoder that outputs BCD. Since I introduced the 7447 and the 7 segment display, it counts from 0 -9 perfectly, but goes a little crazy after that. What happens if you select a binary 1010 (A) on your dip switch? I would like to get an "A - F" out ???

[@QRobotix]

Hi no it does not display Hex after 9

[@aliyasser4364]

How much volt your battery is ?

[@japneetsingh3269]

Sir which IC should be used in this circuit , is it 74HC47 OR 74LS47

[@QRobotix]

either will work

[@Fantasyworldofnoor]

Agr hum ne sirf 5 tk display krwana ho mtlb 0 to 5 to kesy ho ga?

[@RahulKumar-oo3lv]

help me on it, for display 6 I need this orientation (abcdefg=10111111) but we get (abcdefg=00111111), how can we get required bit orientations

[@QRobotix]

Hi you would have to connect the 4 inputs to a 4 input AND gate and use inverters as necessary for the number 6. Then connect the output of and gate to the digit a

[@nitinshrinivas5115]

Hey, why is the 6 not displayed properly??? in your experiment even I too tried on Tinkercad but not working for me either... I mean the 6 is not being displayed properly.

[@QRobotix]

What is it displaying?

[@nitinshrinivas5115]

It is showing 6 without that segment naming 'a'...

[@_GauriSanjayBarge]

What type of battery is used here and can we replace it with some other battery

[@QRobotix]

Hi the most important consideration is the max current rating for each segment. Typically it's about 20mA for leds. For my setup, I used a 6v power supply (4 AA batteries) with 470 ohm resistors. If you use ohm's law, that comes out to ~ 12 mA of current.

[@_GauriSanjayBarge]

@@QRobotix thanks

[@lorenacervantes1871]

what is that thing around the switch and those black thing in the jumper wires?

[@QRobotix]

Hi the thing around the switch is a pcb board. The pins of the switch were too short for the breadboard so I attached it to a pcb with male headers so that it would fit securely on the breadboard. The jumper wires are dupoint jumper wires and they come like that when you buy it.

[@varathan2081]

When -ve to vcc,+ve to gnd of battery connected,then only it's glowing but it is showing 8 not 0,please help me in this regard

[@QRobotix]

Hi check to make sure all leds are working on your 7 segment display

[@craigmunday3707]

Any advice on how to do hex to 7 segment display decoding?

[@QRobotix]

Where is the hex input coming from?

[@productsunboxing6255]

Battery voltage?

[@abderrahimessarfi7641]

Wath about RB ind and LT anx RB out

[@RicardoSilva-zc1oc]

Hello, how do I convert binaries to decimals on 7-segment, 5-digit but 16-bit displays? and being that I can only use decoders for the transformation. help me please.

[@Buissnessesmotivations]

Hey bro can you tell me how to make two digits seven segment display from 00 to 15 only

[@QRobotix]

Yeah it can be done using logic gates. I ll make a video on it once I have some time. Really busy with school at the moment.

[@Sultantechnicaltv]

How to display 8-bit binary number using seven segment display?

[@QRobotix]

Using 8 switches: If you wanted to build one you would have to map out all 256 values of all 3 of the seven segment display outputs and use K-maps to derive the necessary combinational logic.

[@27marialou]

can a 9v battery as a power source can be used to ligth the led? i tried it and it did not work as it should.

[@QRobotix]

Try using a higher value resistor if you want to use a 9v battery

[@animeeditzz1145]

​@@QRobotixhigher values for both the resistors of 1k ohm one and 470 ohm one??

[@ibrahimreda7563]

I need 7_ segment common cathode

[@marinfor777]

Hi Is it possible to have similar, but for 8 dip switches to 256 addresses?

[@QRobotix]

Hi, not that I am aware of. If you wanted to build one you would have to map out all 256 values all 3 of the seven segment display outputs and use K-maps to derive the necessary combinational logic required. Or just use a microprocessor. Goodluck

[@gecellgucila632]

Is there any change if I use 74LS47 instead of the using 74HC47?

[@QRobotix]

Compare the data sheets between the two to see if the pinouts are similar

[@mrunalinaik3197]

How to display dot on it?

[@FrenchFries402]

the dot indicates the decimal in the number you want to display, so you have to input the BCD/decimal equivalent of that number

[@esvinhernandez6043]

Just connect pin 5 (of the display) to Ground if it's _Common Anode_ If your display is _Common Cathode_ then connect pin 5 to vcc

[@POLMAZURKA]

WHY NOT WIRE THE BOARD WITH POSITIVE 5 VOLTS AT THE TOP OF THE BREAD BOARD?

[@QRobotix]

Each segment needs to be powered individually or else there will be a difference in brightness depending on the number of segments that are on at any given time

[@mahmudhasan4654]

what if i use 12k ohm resistor instead of 1k ohm resistor?

[@esvinhernandez6043]

There will be no problem if you use them with the dip switch...

[@welaynawab6233]

bro please i have one project can you make

[@QRobotix]

What is the project?

[@PAT4SAM]

isn't working lol and battery getting hot

[@miguelodones9324]

I suggest not to use 6volts power supply, use higher that 6 volts :>

[@elizaperez4282]

Korique

[@HamBaconHamilton]

Yeah, i run everything on 9 volts btw.

[@robinmaikle9212]

Verify your electrical circuits on the go! Track down: 'Circuit Solver' by Phasor Systems on Google Play.

[@judegarcia8633]

Is it okay to use common cathode 7seg for this?

[@esvinhernandez6043]

Yes!... BUT you need 74LS48... The display you're talking about won't work with 74LS47

[@jeorgiocydneygarcia9741]

can you use a 9v battery as its power supply?

[@QRobotix]

Yes you can. Just make sure you choose an appropriate current limiting resistor for your display segments

[@ahmedroshdy8992]

why didn't you connect one( 470 ohm) resistor in the common anode instead of these many resistors

[@QRobotix]

Because each number uses a different amount of Led segments. Therefore the brightness wouldn't be consistent