Thanks this circuit is simple and solid!!! Works!! I used an infrared led and a phototransistor as the optocoupler and a 2N2222 transistor, I was able to switch the isolated relay using an Arduino.
Your videos are awesome. Really helps newbies. You explain the concepts on paper. Then you do two iterations, one on the breadboard and then on the perfboard with all the pin details. That really helps. And no irritating background music. Subscribed!
Thank you for this!!! I've been looking for a stupid simple solution to drive my 5v relay with a 3v output from my ESP32 and didn't want to create an entire step up voltage circuit. So I paired this with a logic level converter and am not able to drive all my relays reliably!!
The question I have is how do you obtain the second power supply? ie do you use a transformer and a rectifier, or a dc-dc converter? In your example, you are isolating a 5v power supply from a 5v power supply. There doesn't seem much point, but I suspect there are safety benefits, maybe protecting the microcontroller from potential high reverse voltage from the relay coils. The main isolation from the mains power supply is provided by the relay itself, but you don't really talk about that.
We can do it without optocoupler. But, to electrically isolate the low voltage circuit from the high voltage circuit, we have to use optocoupler and a different power supply to operate the relays.
@@EEWave Yes U are correct, but I think it is also possible to use PNP and NPM transistor working together witch simply PNP is on high voltage site and NPN on microcontroller site ,but they are not completely isolated though. Your solution is definitely one to use in production circuit . Well done !
Hi, good video. Very informative, but I have a question regarding bc337 transistor component in the circuit. I don't understand, why we need it in the secondary circuit, and what will happen if I remove it, will the circuit still work? I am assuming it is used to isolate 5v and emitter pin of optocoupler.
My understanding is that the optocoupler cannot handle the amount of current required to drive the relay coil. Therefore the transistor is used as a current amplifier.
Very nice bro.your way of teaching is excellent. Even which pins or wire contact to Arduino and Which pins or wire connect in external power supply. diagram and coding also was excellent. Thanks👍
Isolation means there should not be any kind of electrical connection between input side and output side. If we use same ground or single power supply to powering the microcontroller and to powering the relay, then there will not be any meaning of using the optocoupler.
No damage. You can use this as a simple relay board. If you want to make HIGH triggered relay board, then please watch this video: th-cam.com/video/R7nD7RA26xE/w-d-xo.html
This circuit is 100% accurate circuit, it is LOW triggered relay board. I think you are facing some problem with LOW triggered board. Now I've uploaded the HIGH triggered relay board video, link in the description below. I hope that video will help you.
Bhai. Maine ek hindi channel shuru kiya hai. Woha pe dhire dhire video dal raha hu, please wo channel please visit karke feedback comment sections mai dena. Mai try karunga usko better banane ka. "EE Wave hindi" hai channel ka naam.
Can I add 1n4148 diode in high trigger level circuit which u made ?
Thanks this circuit is simple and solid!!! Works!! I used an infrared led and a phototransistor as the optocoupler and a 2N2222 transistor, I was able to switch the isolated relay using an Arduino.
Excellent!
Your videos are awesome. Really helps newbies. You explain the concepts on paper. Then you do two iterations, one on the breadboard and then on the perfboard with all the pin details. That really helps. And no irritating background music. Subscribed!
Thank you, welcome to my Channel..!
i realize I'm pretty randomly asking but do anyone know a good place to watch newly released tv shows online ?
@Brodie Gus meh try flixportal. just search on google for it:D -cristian
@Cristian Jadiel thank you, signed up and it seems like they got a lot of movies there :) I really appreciate it !!
@Brodie Gus happy to help =)
how about transistor, if i change bc 337 with bc 547, can this ?
I have to say, I saw many video's explaining this, this is one of the best (no resistor between signal and led?)
Thank you for this!!! I've been looking for a stupid simple solution to drive my 5v relay with a 3v output from my ESP32 and didn't want to create an entire step up voltage circuit. So I paired this with a logic level converter and am not able to drive all my relays reliably!!
can I still do the same thing without the octocoupler?
Could you explain why you choose 10k for the base resistor?
Awesome video!
Thanks for your explanation. gone give it a try
I have an essential question, once we use ULN2803, can we do without the free-running diode for the relay?
thank.
This IC has common freewheeling diode so we don't need to use.
The question I have is how do you obtain the second power supply? ie do you use a transformer and a rectifier, or a dc-dc converter? In your example, you are isolating a 5v power supply from a 5v power supply. There doesn't seem much point, but I suspect there are safety benefits, maybe protecting the microcontroller from potential high reverse voltage from the relay coils. The main isolation from the mains power supply is provided by the relay itself, but you don't really talk about that.
Could it be possible to use MOSFET transistor or BJT transistor instead of Optocoupler ?
We can do it without optocoupler. But, to electrically isolate the low voltage circuit from the high voltage circuit, we have to use optocoupler and a different power supply to operate the relays.
@@EEWave Yes U are correct, but I think it is also possible to use PNP and NPM transistor working together witch simply PNP is on high voltage site and NPN on microcontroller site ,but they are not completely isolated though. Your solution is definitely one to use in production circuit . Well done !
Really good video, I should add.
what if we wanted to run 3v relay ? what are the values going to be ?
Amazing tutorial and explanation ! Thank U!
Glad you enjoyed it!
I have a question. If I use the 24v instead of 12v/5v. Is is okay or it maybe cause damage to opto.
Thank you.
Can I use MOC3021/41 instead of pc817
And I want to use +ve volt for ( optocoupler) signal so what can I do for it.
Hi, good video. Very informative, but I have a question regarding bc337 transistor component in the circuit. I don't understand, why we need it in the secondary circuit, and what will happen if I remove it, will the circuit still work? I am assuming it is used to isolate 5v and emitter pin of optocoupler.
My understanding is that the optocoupler cannot handle the amount of current required to drive the relay coil. Therefore the transistor is used as a current amplifier.
Can I use bc 547 transistor also
Yes, you can.
Great tutorial 👍
Thanks a lot.
Glad you liked it!
If the input signal voltage is 3.3 volt. Will ot work.
Very nice bro.your way of teaching is excellent. Even which pins or wire contact to Arduino and Which pins or wire connect in external power supply. diagram and coding also was excellent. Thanks👍
You're welcome bro...
Nice precise
Hi ... is this BC337 -25 or BC337 -40?
3:00 why can't the ground be same?
Isolation means there should not be any kind of electrical connection between input side and output side. If we use same ground or single power supply to powering the microcontroller and to powering the relay, then there will not be any meaning of using the optocoupler.
@@EEWave I understood you want to completely isolate the relay module, but if I make the ground common will it cause any damage to the circuit?
No damage. You can use this as a simple relay board. If you want to make HIGH triggered relay board, then please watch this video:
th-cam.com/video/R7nD7RA26xE/w-d-xo.html
Bhai 16 chanel m ic based भी बता dijya
Thank you❤
please provide components list
Great work congratulation !!!!!!!
Thanks a lot!
how to use different power supply for real life project...their ground must be common
how can I put 1000 thumbs UP? impressive tutorial.
Thank you so much dear...
thank you for infor
Always welcome
Super cool maître mais parfois veuillez faire en français,je suis francophone . veuillez agréer mes sentiments les plus distinguées...
bhai diagram ka pdf link me daldijia
Y
Ye circuit kaam nahi krta
Kya dikkat aati hai bhai iseme
This is LOW triggered relay board. I uploaded the HIGH triggered relay board video, link in the description below. I hope that video will help you.
West my money
This circuit is 100% accurate circuit, it is LOW triggered relay board. I think you are facing some problem with LOW triggered board. Now I've uploaded the HIGH triggered relay board video, link in the description below. I hope that video will help you.
Hindi me hi bol leta bhai
English samjh nahi aata
Bhai. Maine ek hindi channel shuru kiya hai. Woha pe dhire dhire video dal raha hu, please wo channel please visit karke feedback comment sections mai dena. Mai try karunga usko better banane ka.
"EE Wave hindi" hai channel ka naam.
Bhai ye video nahi hai. Abhi tak hindi mai isko banaya nahi. Agar aap logo ka ashirbad ho to jarur video dalta rahunga ek ke bad ek.
Ok bhai. Plz jaldi banao ye vedio hindi me
Mere ko bahut jarurat hai plz
Mere pas remot contl switch ka pura metariyal hai
Mob par vedio cal par help kar sakte ho to mob number de do plz
Plz help me