Electronic Basics #8: Everything about LEDs and current limiting resistors
video description
Simply on my mynd comes to connect lab power supply and increase voltage untill current reaches 0. 02A. But this work only with 3-5mm led's. What about >0. 2W led's?
I have 10W LED 220V lamp, and its failed. I taking apart and see one led with black spot - it's busted. My Unit 61E can lite up small led's in Diod Test mode (2. 85volts, and he did it with other led's on lamp. But there is a problem driver gives 155Volts for 17 leds directly (no resistors on led's pcb): 155V / 17pcs = 9V (around. How 2. 85Volts can light up 9V led?
Current in this circle is 150mA (measured on failed led, by bypass him, and there is second problem - there is no 2835 LED with 9V / 150mA existed! Only 3. 2V/150mA or 9v/100mA. So what LED should I order to replace failed?
Is there is some method to identify U/A for unknown LED?
Date: 2020-09-05
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Comments and reviews: 9
Kostas
Hello and let me start by saying that your videos are epic! They have helped me a lot! Now I too want to ask about the 2 LEDs in series in respect to Kirchhof's 2nd law.
The law states that the products of resistance times the current of all conductors must be calculated. Doesn't that mean that you need to take the voltage drop of the LED into account instead of the nominal voltage.
So in the case of the 2 LEDs you need 3. 2 + whatever the voltage drop (usually very small) is not 3. 22.
What do you think?
reply
Hello and let me start by saying that your videos are epic! They have helped me a lot! Now I too want to ask about the 2 LEDs in series in respect to Kirchhof's 2nd law.
The law states that the products of resistance times the current of all conductors must be calculated. Doesn't that mean that you need to take the voltage drop of the LED into account instead of the nominal voltage.
So in the case of the 2 LEDs you need 3. 2 + whatever the voltage drop (usually very small) is not 3. 22.
What do you think?
reply
Bert
My head hurts now.
And i still dont understand how to make a simple 4 led circuit for my rc car body haha.
Day later my head still hurts but i got a couple of resistors from scrap electronics and now its Alive!
Not very bright but i think it works
And for some reason the quarter dropped and now im just gonna use 2 aa batteries and works without burning leds all the time.
Im a dumb ass
reply
My head hurts now.
And i still dont understand how to make a simple 4 led circuit for my rc car body haha.
Day later my head still hurts but i got a couple of resistors from scrap electronics and now its Alive!
Not very bright but i think it works
And for some reason the quarter dropped and now im just gonna use 2 aa batteries and works without burning leds all the time.
Im a dumb ass
reply
Germn
Excellent Video clip! Excuse me for butting in, I would love your opinion. Have you tried - Runayslarn Survival Manifestation (just google it? It is a good one of a kind guide for discovering how to repair your electronic items without the headache. Ive heard some incredible things about it and my work colleague after a lifetime of fighting got astronomical results with it.
reply
Excellent Video clip! Excuse me for butting in, I would love your opinion. Have you tried - Runayslarn Survival Manifestation (just google it? It is a good one of a kind guide for discovering how to repair your electronic items without the headache. Ive heard some incredible things about it and my work colleague after a lifetime of fighting got astronomical results with it.
reply
J.
Hallo! u. Guten Tag! sorry my written german isnt too good! Have you made a lightsaber using an LED light string? using around 80 or so 5mm 3. 0 - 3. 2v 20ma LEDs (all wired in parallel) using 18650 LiPo or Li-ion batteries. would a voltage regulator work? thanks i probably will get my LEDs from leading-led dot com (fair prices, nice selection, data sheets, etc) Danke
reply
Hallo! u. Guten Tag! sorry my written german isnt too good! Have you made a lightsaber using an LED light string? using around 80 or so 5mm 3. 0 - 3. 2v 20ma LEDs (all wired in parallel) using 18650 LiPo or Li-ion batteries. would a voltage regulator work? thanks i probably will get my LEDs from leading-led dot com (fair prices, nice selection, data sheets, etc) Danke
reply
EyesWideOpen
Great video. thanks for sharing. Most ppl don't understand how hard it is to work in an advanced fashion with LED's while also balancing power efficiency and component/circuit protection requirements. You did a great job of laying down the overall dilemma's a beginner might need to consider before choosing a solution.
reply
Great video. thanks for sharing. Most ppl don't understand how hard it is to work in an advanced fashion with LED's while also balancing power efficiency and component/circuit protection requirements. You did a great job of laying down the overall dilemma's a beginner might need to consider before choosing a solution.
reply
Aerox
My Infrared LEDs never came with ANY specifications at all =/ They where just put in a plain zip-bag with no labels whatsoever I don't know anything about them, not the wavelenght or even their size. All I know is that they're transparent and has a flat top.
What should I do to figure out their ratings?
reply
My Infrared LEDs never came with ANY specifications at all =/ They where just put in a plain zip-bag with no labels whatsoever I don't know anything about them, not the wavelenght or even their size. All I know is that they're transparent and has a flat top.
What should I do to figure out their ratings?
reply
SkyePupGames
Can you please not write your 9's like G's. I have been sitting here for like half an hour trying to understand Kirchoff's Law when the entire time what I thought said Gv (which I had no idea what this variable was) was actually 9v. Please. For the children.
reply
Can you please not write your 9's like G's. I have been sitting here for like half an hour trying to understand Kirchoff's Law when the entire time what I thought said Gv (which I had no idea what this variable was) was actually 9v. Please. For the children.
reply
Denis
I have a project but can't get the resistance Part. so If I have 13x3. 4=44. 2 LED's and batteries 3AA at 4. 5v running at 20mA the net calculator gave me a resistance of -1985 is that correct?
reply
I have a project but can't get the resistance Part. so If I have 13x3. 4=44. 2 LED's and batteries 3AA at 4. 5v running at 20mA the net calculator gave me a resistance of -1985 is that correct?
reply
dinesh
Hey Buddy can you please help. is it possible to used 1v led with 1. 5 battery for a 60 day with a dailly used of 8 hrs. if yes then please help me with the process. thanx and regards
reply
Hey Buddy can you please help. is it possible to used 1v led with 1. 5 battery for a 60 day with a dailly used of 8 hrs. if yes then please help me with the process. thanx and regards
reply
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