Simple Transistor relay circuit | Transistor as a switch

This tutorial will guide to to make simple circuit using NPN transistor as a switch to turn on electrical appliances using relay. Learn More...
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Transistors get forward bias when we supply voltage to Base and emitter. Once the transistor get forward the current flows from collector to emitter. and once we make it reverse bias, current flow from collector to emitter stops. this acts like a switch.
We used this property of transistor to switch relay. So transistor is just a switch or you can call interface between your micro controller and relay to turn on and off electrical appliance.
Don't forget to watch the Proteus simulation of the transistor and relay at 2:06 of this video.
For more cool electronics projects, Subscribe to our channel. / @myelectronicslab
Also Visit our blog www.myelectroni..., for more interesting tutorials.
Thanks for watching. Have a good day. :)

[@kabandajamir9844]

The world's best teacher

[@mksgful]

It's very easy and perfect explanation of relay and transistor.

[@Mijesho]

Try to reduce volume of ur music too hard to hear ur voice..

[@MyElectronicsLab]

+MIJESH PUTHIYOTTIL thanks for your feedback, i will keep in mind next time

[@miteshgohel5569]

Thank you so much for this video. It has helped me so much. it has solved my problem of interfacing nodemcu (3.3v) with relay.

[@democracyforall]

What is the name of the software he is using.

[@am7-p]

What is the name of the simulator software you used in this video?

[@rorylee1021]

I was wanting to know the same thing... I've been wondering if one existed... it sure would be great to use...

[@specialrepair]

Good evening if we want to try a relay from the transistor what are we bridging? collector with emitter or base with collector thanks

[@nishitkumarbhavsar3991]

Can you tell me which software to use to make this transistor relay video ?

[@nicholasschmidt3605]

What advantage does this have over connecting the switch directly to the motor without a transistor?

[@bjarnenilsson80]

Well lets say you have a 400v motor here insted of the 12 v motor, having to deail with 400 v for controll signals is not convinient since micro controllers cant handle such high woltage and I.m not shor if the relay in this exsampke can be controlled wit 3.3 V (normaly the putton in this exsampke wit nit be a button put n outpoy pinf from a microcontroller)

[@jeremyhenderson163]

Thank you for the time and effort you put into your video. Would I need a certain type of relay to switch an AC motor (under 10A) on'off based on the voltage of a DC power source (12v-24v)? For example: I want my AC 120v fan to turn on when my 12VDC battery bank drops to 10.5v and back off once the bank voltage reaches 14ish volts. I know I can connect an under voltage/over discharge module to connect/disconnect the battery, but I need a relay to keep the AC and DC currents isolated from each other. I'm sure I'm probably making this out to sound more difficult, but I am new to electronics. Thanks and apologies in advance.

[@3dmixer552]

Hi. I need to do a relay board for automotive relay that core pulls at 12v and 160mA. I tried 2n2222 npn transistor but it got really hot in a short period of time. Which transistor would you recommend for this setup? Thanks

[@sachinibuddhika6155]

Do you recommend the same transistor model BC547 for any type of relay?like 5V ?

[@रिदेशश्रेष्ठ]

actually you are not limiting the voltage using a resistor, a current is being limited to the base terminal

[@javvajikondareddy2233]

Good bro

[@RixtronixLAB]

Nice video ,thanks :)

[@panwarhappy9368]

Bahut sahi explanation

[@CrazyCoupleDIY]

Great one bro

[@santoshbabu517]

hi can you suggest me a circuit in which apply 3 v keeps off the circuit

[@thefuturetechnology4285]

What is the name of the program used in the circuit?

[@jacobslab4824]

You should make a video on "how to make a tezla coil" it gets peoples attention

[@MyElectronicsLab]

thanks for your suggestion, I will make one for sure, Thanks a lot.

[@avramitra]

Sure, it will be a unique one as there is no such thing as "tezla" coil. :D

[@abdulrasheed3424]

sir we need to keep the switch pressed to work the device ? or just one press it will work and second press will off?.please explain

[@QuickishFM]

it needs to be kept on

[@sxl2mill]

whats the pcb software you test the circuit in ?

[@varshakesharwani6985]

Which application do you used in pc for circuit

[@AndrewCubacub]

Sir! What is the name of the software you were using to make schematics? and what website I can download that?

[@MyElectronicsLab]

this software is call proteus , You can download the crack from the internet. its a paid tool

[@MyElectronicsLab]

Here is a tutorial >>>> kzbin.info/www/bejne/joewg2l7erllj6c

[@AndrewCubacub]

Thank you

[@MyElectronicsLab]

Welcome ;) Don't forget to share and subscribe :)

[@muhamadkarzan3213]

thank you brother but is it safe for the microcontroller?

[@santoshbabu517]

i do have a 4 channel RF receiver, which on power supply keeps on all the 4 LED and when i used to press transmitter button particular led gets off. i want wise versa so that pressing button make it on.

[@MyElectronicsLab]

hmm. You can use a not gate ic , thats simple or a pnp transistor like bc558. that should do the job.

[@javvajikondareddy2233]

Keep it up

[@erpankajdas9260]

Which software you use for explain this

[@rorylee1021]

Bro, what computer program are you using? That would help me more than anything.

[@watchingyoutubeat]

just zoom the video in pc web browser and see the name Proteus Professional Proteus is a Virtual System Modelling and circuit simulation application. The suite combines mixed mode SPICE circuit simulation, animated components and microprocessor models to facilitate co-simulation of complete microcontroller based designs. ... You can also download Proteus Professional 8.7 SP3.

[@suneelkumarhn5665]

Which software used for simulation plzz

[@abc-nh7gz]

What say to the electronics product seller about relay so that he give me a correct relay for my project Just like volt,ampere or another fact

[@dicksondiaw8140]

Slt merci pour les videos big up

[@Sanjeetkumar-yx4fj]

What is your software name you are using to represent.

[@MukulAnand0911]

On which software simulation is done. Anyone have idea

[@chaanitechnical5467]

Dear sir, Which software do u used for simulations electronic components .

[@Jorgetime]

Proteus

[@tejasa9033]

in this video which software used for simulation can u pls tell the name of the software

[@MyElectronicsLab]

proteus 8

[@TinyWords]

Music is really annoying and loud.

[@MyElectronicsLab]

Thanks for your feedback, I will keep in mind next time..

[@shivamsaini6383]

Sir aap ye circuit kis application me bnate ho please naam bta skte ho ?

[@bhekumuzinkosiyabobukwele5929]

Which simulation software are you using?

[@MyElectronicsLab]

proteus 8

[@wahyuramdhani9413]

What simulator do you use?

[@yoriarif]

I think the simulator name is proteus

[@terrylick5908]

perfic music for the occasion 👍

[@ELECTROGYAN]

Don't Use the background music

[@alansilva803]

Hey, what software are you using in this video?

[@MyElectronicsLab]

movie maker

[@alansilva803]

+My Electronics Lab no, haha. I meant the one where you simulate the circuit.

[@MyElectronicsLab]

oh sorry, thats proteus 8

[@shahtechnicaloja8639]

What software do use for electronic components test

[@MyElectronicsLab]

+Shah Tech Oja that software i am using in this video is named proteus. For Component testing i use multimeter.

[@shahtechnicaloja8639]

My Electronics Lab on pc

[@dharmveerfaujdar5416]

Good

[@annetterodriguez2668]

My key fob doesn't unlock my doors my air pressure sensors are not reading my fuel gauge is not reading what can it be oh but if I put the key fob on the cup holder the truck does turn on

[@wentworthmiller5]

Simulator name bro

[@tariqahmad134]

I want to know the software name r u using

[@MyElectronicsLab]

proteus 8

[@kumkumkargwal2855]

sir can we make this automatic on off dellay for 15 sec.plzzz replyy fast

[@MyElectronicsLab]

Yes, of course you can do that , You should use one microcontroller like at89c51, arduino, pic.15 sec can easily achievable. use delay(15000) in arduino, If you need more you should go for timer control.

[@kumkumkargwal2855]

sir plz giveaway me arduino atmega 328p-pu I need it. plz I will put video on youtube. and there I will publish your channel name and info in big letters. Plz,Plz

[@MyElectronicsLab]

Describe me why you need this, and why should I give you. I would happy to help you. :)

[@12alimaher]

why dont you add a resister in series with the indector nd add a switch to them all in series ?

[@MyElectronicsLab]

I did not understand what you mean, can you please explain?

[@12alimaher]

i think that there is no need to the transistor in you situation .

[@MyElectronicsLab]

You are right, But Purpose of this tutorial to demonstrate, how to drive one rely using a transistor, This is help you when you connect to a GPIO pin of microcontroller

[@12alimaher]

even with the micro controller we can connect one of its gpio pins directly to the relay and it will work isn't it ?

[@MyElectronicsLab]

No, That's not recommended, Two case: Case 1. Lets say your reply is of 12V or 5V and microcontroller gpio is 3.3V, and Case 2: Your relay draws 50mA or more and MCU gives 10mA , in those cases you have to use transistor. You should not ever put load on MCU, because they are not rated, If you read datasheet of any MCU and compare current need and deliver, you can easily guess. :) , Hope I cleared your doubts.

[@mohamadmahshori9862]

nice

[@tejaskamble0872]

कसे जोडले ते सांगितले पाहिले ground ला काय जोडले पाहिजे voltage ka.. battery किंवा current कसे काही करंट किंवा battry ground ला जोडणी केली पाहिजे घरातील लाईट वर जोडले पाहिजे ते संगितले पाहिजे

[@danielmart3846]

what is the programm called please

[@MyElectronicsLab]

proteus 8

[@BaseSRKI]

You don't replace why the transistor is needed>< thanks though

[@Nazmulsaidi]

Why not just using a optocoupler? Or a mosfet to make a steady switch. Why going through all these trouble??!!!

[@kumkumkargwal2855]

sir because, I live in city where i cant buy these things and my arduino uno bootloader get destroy so plz help, In return i will support you on youtube

[@MyElectronicsLab]

email me your address, I will try to check my inventory, If there will be surely, I will send one. email me at [e-mail]

[@mach37]

The background sound is very annoying. I had to turn off the sound.

[@iot_enthusiast]

very clear explanation. btw, which simulation software are you using

[@MyElectronicsLab]

proteus 8

[@kumkumkargwal2855]

hope you help

[@punjabiculture4433]

there's no need for background music information was ok

[@MyElectronicsLab]

+punjabi culture thanks for your feedback, I will keep in mind, bg music only feel the gap while I am explaining, i will lower the sound next time.

[@Nocturnes1984]

Eletrical

[@johntitor7671]

I don't understant what a use of transistor.Why you don't put the switch simply on the 12v line of relay coil ???

[@MyElectronicsLab]

Hello, the purpose of this tutorial to show, how transistor can be used as switch, there is no need, but its scenario, how you can use with mcu or other cases.

[@jonestom3563]

What software you are using my friend

[@Renato_De_Bulhoes]

It's Proteus friend.

[@nicksix71]

No protection diode? bad!

[@ssvmbaghmara]

Jab NPN transistor ka collector pe 12 v h to base pe 3.3 kese laye

[@MyElectronicsLab]

sorry for confusion.. aap 12v to 3.3 convert karne ke liye voltage regulator ic use kar sakte hai, IC jaise ki 78L33 or LM2950 use kar sakte hai .. thanks

[@niagjames7243]

James Hakizimana

[@muppetpaster]

Loud (annoying) music and bad spelling, great combo!

[@kumkumkargwal2855]

dude did you recieve email.plz tell what's your response reply fast plz

[@LifeOnHoth]

smells like entitlement...

[@ramioneclint8204]

answer is really.

[@mechninza5386]

how to prepare a wireless remote to control a car

[@MyElectronicsLab]

you can use rf module or esp8266 wifi chip, there are tons of tutorials over internet

[@yogeshsuradkar6613]

Simple

[@elektroinstal]

why not push button directly in circuit with coil? wouldnt be the same? dont understand what is the point behind transistor in this circuit? tnx

[@MyElectronicsLab]

Hello, Transistor works same as push button, but when you need things to be automated then you need transistor. assume , you are out of station, and you want to switch on your home lights remotely, how will you push the push button, in those case you need transistor instead of push button,

[@elektroinstal]

My Electronics Lab thank you

[@MyElectronicsLab]

thanks, show support by sharing , subscribing and liking out video , Learn and Share to others .

[@igrewold]

The relay is 12v while the controlling voltage is 3.3v so it can never ever turn the relay on! So, basically the idea is that the 3.3v turns on the transistor which allows the 12v to switch on the relay. Luckily there are lower voltage relays like 9v, 5v and 3v. So, that helps if you were using a microcontoller(uC/MCU) to turn the relay on.

[@MyElectronicsLab]

yes you are right 3.3v realy are also now a days available, but problem is current, if you are connecting more relay, then its not advisable to draw lot more current from mcu, which can damage mcu.

[@kumkumkargwal2855]

us this email addres ic correct

[@itsjohan]

Music is too loud and not necessary at all

[@kelvinkersey5058]

Hard enough to follow the speech, why the crap music on top of it?

[@sah_shrawan]

background music 2 much problem sir

[@orbitalweapon7538]

Why we make it complicated using transistor u can use simple push switch only

[@CrazyCoupleDIY]

Not really

[@LifeOnHoth]

Hehehehe. How well do you actually understand electronics? It's a kinda silly statement u know... why use a transistor when u can just use a switch? U know.... sometimes you want things to turn on and off without you being there to operate the switch... Does that clear things up a little bit for you?

[@moinuddinkhan786]

Music me sun nahi pa raha hu

[@kkinva68]

doodebaa wiooba neeleeb

[@saumyamandal6489]

Please stop the music....it's unnecessary. ...

[@er.sukhwindersingh502]

Ek baar practical karke dekhiye it will not work

[@sefa223]

side view video...hopeless everrr

[@user-bl6us1mn1e]

hindi me video banao bhai

[@rahullikhar4773]

impossible to work in practically.... the base triggering voltage of bc 547 is 3.3v it will turn on the transistor but it will give only 3 to 4 volts to relay and result RELAY WILL REMAIN OFF .....!!!!!!!!!!@###

[@MyElectronicsLab]

I request you to read datasheet of the BC547. Vceo of Transistor is 45V, and Ic(Collector current is 100mA)which is practically more than enough to drive a small relay. I have tested more than 50 times in my last projects. So be assured. Hope it make clear, you can always ask, if still any confusion. :)

[@w4rh34d1]

transistor will help to switch/connect the collector and emitter which is 12 v which is from other source. and with the base of transistor act a switch which only needs a few milliamps to connect the col and em.

[@pammysingh6526]

Learn to speak English it will help you

[@lateeflateef2830]

bhai hind me banao video

[@MyElectronicsLab]

hello bhai, sorry, abhi itna time nehi mil raha hai hindi mein video bana ne ke liye,futuer mein sure hindi mein video banauga.