Voltage divider tutorial
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- Опубліковано 9 січ 2010
- This video shows the basics of voltages dividers and how to build one. Power consumption considerations and equivalent series resistance issues are also discussed.
More videos at www.afrotechmods.com/ - Наука та технологія
The more I get into electricity, the more questions I have
Kirill Vishnevsky. Sounds like you are on the second stage of knowledge. Next it will be knowing what you don't know and then knowing more than you know.
It never ends.
Luckily for us there are tons of videos here on this subject. At least this video shows you the dangers of picking wrong resistance values for your voltage divider, most other people talk about them as if it was easy for a 5 year old to understand. Just keep digging. :)
That's what electrical engineering is about
Kirill Vishnevsky right there with you
Gotta love the resistors on fire clip!
Okay, you make electronics waaaaay more interesting than at school where we learned basically everything in theory. Keep it up!
(Know that this is now a 9 and a half year old video but its still very much informative and the quality is even competing to today's standards which is really impressive)
13 and still killing it
Finally, some real world examples, not just theory and formulas as in many other tutorials
thank you for explaining this in such a way that i can grasp what i am attempting. i work in an electronics shop, but i am just now taking time aside with my boss to understand exactly what i am doing. i plan on building guitar effects pedals and eventually tube amplifiers. keep up the good work. thanks again.
A wonderfully clear and concise tutorial. Brilliant video, like the rest of your work. Appreciate your time and learned a lot👍
That made so much more sense than the numerous other videos I watched on this subject. Thank you!
Can't get any better than this. Excellent work my friend.
Thanks for the tutorial, very informative.
Another possible use (I hope it works, I still have to try it) is to regulate the Output voltage of a sensor which works on 10V basis and gives you 0-10V Output down to something a 5V basis microcontroller can handle in it's analog inputs (so regulate 0-10V signal down to 0-5V signal to be able to read it).
This made voltage dividers make sense to me finally.
The best ever video about this subject I have ever watched here in youtube, great quality, good explanations and examples. Thank you so much, I will keep checking on updates on your channel.
Buen dia, soy ingeniero electrónico y me encantan sus videos... son la locura! Hacia tiempo que no veia sus videos... en Colombia también hay necesidad de aprender y sus videos estan bien explicados. Saludos y espero su prox video. Have a nice day !
u teach such useful things!
Thank you, exactly what I was looking for!
I just found your UA-cam Channel and your Videos are absolute Treasure for me. The way you explain things and share your Knowledges is very good and super admirable. Thankyou Afrotechmods!
You are welcome!
Glad you made this - I forgot my most basic electronic skills, and can now use that 0-100v meter to measure my 1000v capacitor bank, using a 9meg and 1 meg resistor :)
lol "This box looks exactly like a calculator."
Your videos are very helpfull for me as a electronics student.Thanks alot and nice explanation !
a true hero my friend perfect
Your videos are really helpful, I wish you were make them again.
Relatively new to electronics. Got lost @ 2:39.
However, I've fount that watching a tutorial several times, along with wathing others, it sometimes sinks in and I get the concept. Cheers
BEST TUTORIAL in real world.
Concise, clear and rich in content! Awesome!
Awesome video. I didn't fully understand how it works until I saw this.
Awesome explanation, thank you very much!
I'll try to keep those 10mA in mind ;)
It's VERY useful to power everything you want. It's the first video mentioning power dissipated I've seen. I also had problems without making a buffer. An opamp can take the high voltage and adjust to another (lower) voltage via inverting/non-inverting input. Not sure about efficiency, but I check for heat. Some devices won't start from losing power in what you think will work. It's back and forth, trial and error for some time, I guess.
this video just clear my mind.
Thanks so much
Thank you so much, you have the best videos!!
Good and very easy tutorial to understand...Bravo!
Amazing quality soldering in the thumbnail. ;)
Excellent teaching. Fire used to great effect at 1:57 !
Most clear explanation!!
Superb tutorial!
Jim
Very helpful and very well explained, thank you very much
very good video and informative as well.
Thank you, it was very informative
A damn fine tutorial!
good tutorial and details about voltage divider
Thank God you make this video.... 🙄🙄🙄Thank you so much
Thank you it was so helpful!
Thanks a lot for this video.
@3:35-3:43 Can you do a video about combining circuits to create more complex circuits? In particular, I'd like to have the topic of creating "modular circuit" addressed where you'd show us how to (or examples of) circuit blocks that don't affect adjacently connected circuits.
This is the most ive learned in 2 semesters of circuits
Valuable content.
nice explanation, thanks
good tutorial for anyone looking for a quick review
The higher the resistance on the bottom near ground, the higher the voltage. I love it.
this is what i was looking for, that combines several parameters ( electromotive field force to current and power calculation )
Thank you so much for explaining this in an understandable way.
So clear thank you
Thank you so much for this. Can you please explain more about the current part?
excellent tutorial^^
I sum electronics as the flow and control of water in a network of pipes with resistance and gates.
Great channel, great knowledge, too helpful. Thank you for the equations.
Very good explain thanku
Thank you very much man
great video
PERFECT... THANK YOU
Brilliant thank you
This fills in so many gaps in my knowledge and answers questions I've always had. However I'll never get my head fully around this. That's why I just buy a buck boost converter so I don't have to worry about it. I just don't get how using smaller OHM resistors dissipate more power. I thought the ohms were a measure of resistance, and a 1ohm resistor lets most of the current through, where a 10k would stop a lot more and cause heat build up?
Thank you!
thank you,please make more videos
“So the resistor is gonna catch fire” 😂😂
Thank you so much
Now I fully understood
if your really cheap and want a voltage reference you can use a 5 volt reg, voltage dividers and a voltage follower opamp, one side of the divider with a pot and minimum value for adjustments
شكرا على هاذا الترجمه
Can I use (+) and (-) of a AA size rechargeable battery in the top resistance and bottom resistance (following your circuit) ?
Nice video :)
Can you tell me, what software do you use to draw the circuit diagram in the video? I think those circuit diagrams look pretty.
@Afrotechmods Do you happen to have a video on Current Dividers?
Can you explain a bit more at 3:30 about why the voltage drops to 4.56V
I'm kind of new at this but I'm curious what if I need a constant 12 volt but I need 7.5 amps to go down to 5 amps what do I do. Like do I just take a 7.5 amp fuse and then wire to a 5 amp fuse or would it blow the 5 amp fuse...
thank you!
So I tryed to calculate that example about current supply at around 2:10. How do you calculate the voltage drop? What does it mean for the current if you say the Microcontroller draws 1mA? To calculate the new voltage do you subtract this 1mA from the 5mA you had before? So 4mA*(resistance of the parallel path)?
I dont understand it too. And dont know how to calculate it
i believ on it the actual measurement and computation should meet and the requierment... nice..
Thank you
What is the advantage of using zener diode instead of this voltage divider?
Finally i understood...
I'm making a hybrid drive system with a used inverter generator hooked up two a AC 3 phase to dc rectifier and a dc motor , when I run it I'm getting DC voltage up in the triple digits. What can I do to reduce the voltage to at least 24 volts but be able to get a decent amount of amps 50 at least.
Place a transformer on the AC side of your circuit. Also, why do you need that much current?
I guess I am cheap, lol. I was preparing a question just about what kind of load can I apply to such a circuit. What if it is always a high impedance load? I don`t see the problem in the case the load draws less current than V / ( R_1 + R_2 ), which is flowing through the divider anyway. The curent flowing through the load would alter the voltage, but this could be computed if the load current demands where known beforehand.
Am I correct to conclude that the issue is going to be when the current drawn by the load is highy variable? In this case it is not possible to design a divider that will give the correct electrical tension.
thank you
I have 19v guitar amplifier, I want to use the 20v battery. Would you please tell me how could I build the circuit board to drop down 1 volt from the battery to match the voltage for my guitar amp?
Thanks,
Lan
very good
thanks
Hello,
on the four equal value resistor, how do you do the equation to calculate the 0.75 volts? I can get the 0.5 and the 0.25 but cant never get the calculation for the 0.75volts out. and thats all to GND or across the resistor?
"This box looks exactly like a calculator" haha!
What is the best way to power a coil? Voltage divider or regulator?
Great, Can you help me? I want reduce the voltage 1.5V (lr44 Battery) to 1.35v , which one best resistance for this?
Let's say I have 27volts and I want to get an out put of 1ma, what kinda resister would I use???..
With the motor demonstration, you have an R1: 800Ω, R2: 1kΩ resistor, with a load of 50Ω.
Now I'm not too familar with how the voltage is dropped down, but I'll give it a shot, and try to solve the problem of the voltage dropping.
What if instead of R1's value being 800Ω, you make it a 40Ω resistor. Of course the 40Ω resistor would have to be rated for more than 2 watts.. right?
With that, then the R1 : 40Ω would supply 0.225 Amps, at 5vdc.
How or where could I learn a little more about how to calculate that? To account for the voltage drop when you hook up a load with a specific resistance. Or is it just as simple as the fact that it's just another resistance in the circuit, or another resistance in the voltage divider circuit? Am I right? If not, could you please point me in the direction to where I could learn a little more about how to solve that problem?
For a voltage divider to work you need to have zero current flowing out of the mid-point. This is because the divider works because of the resistor in series formula. If any current flows from the mid-point the resistors are no longer in series and the voltage drops.
I've watched this several times. It's clear until we get to the part about power and voltage drop under load. That's all good to know but some more explanation of how you compute it would be helpful. Are you connecting a multimeter to read how much current it draws?
Brilliant!! But i dont understand how can the resistors take AC to power a micro controller.. 0:55
i'm trying to moddify a circuit that uses the following configuration at some point.. (~250Vac > 510k > IC > dc 100k)
Thanks..
Great video! The only part I'm confused is when it was stated that the Vout under a 50 Ohm load is 0.51 V when that load draws 100mA. Isn't voltage drop dependent on V=IR? So if the thing has R = 50 and I = 0.1 A, then 50 • 0.1 = 5 and the voltage drop would be 5 V meaning Vout = 0. Could someone explain where my thinking went wrong. Thanks!
Hi, the motor takes 0.1A when you give it 5V, but since we're only giving it 0.5V it's only taking 10mA.
whyyyyyy is this soooo much easier to understand than my textbook
Sir thank u so much for this information.
Sir i wanna know more about it.
How i can find the current by voltage divider ? And what mean of Rth
I'd say the most popular IC that uses voltage dividing is the 555 timer.
Any op amp in non inverting configuration
@Shekinahguild if you still haven't found your answers send me a message and i'll link you up to some docs, which present in a simple way the equations needed for common emitter, common collector and common base configurations of a transistor. using those you can easily build a class A amplifier. i calculated and built a headphone amp and it sounds great.
of course, class A draws lots of power so you'll want to progress to more efficient design, but it's a good start.
where can i salvage a LM317?
Hi Need your help ..
I have a celling fan (75 watts & 300 RPM Elctric volts 220) normally I like very slow speed but my fan runs very fast on 1 speed regulator .. I need to reduce its speed but can not be done thru regulator as it is alreayd 1 ..I thought to use Resitor and fix it in Regulator on positive wire .. Can u suggest me following .
1. will this work using resistor to slow the speed of the fan ?
2. Is it safe for the fan .?
3. Second what capacity of Resistor to be used to find the result ..?
Kindly repond to it thanks
Do not use resistor. Use a PWM signal with a mosfet, or solid state relay if AC.(I dont know too much about AC, but its alot more complicated, i wouldnt attempt it without really doing my research).
Technically you could do this with a very high voltage resistor, but it will generate a lot of heat, and be a fire hazard if not cooled properly (with a heat sink).
You can use resistors but not the one available in electronic parts shops . High power resistors are used for this purpose . This technique was used decades ago to control fan speed , i don't know whether it's still available in the market . Just serch online , be sure about the ac volt 110/220
I kinda wished you had added one more example that shows what happens when you try to divide a mere 5 volts with the 1 and 9 ohm resistors. Many of us juniors use 1/4 watt resistors, and if my calculations are correct then 5*5/1+9 = 2.5 watts, which should burn up a 1/4 watt resistors (albeit not as badly as your example). Correct?
Correct