Simple LED circuit - basic electronics
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Date: 2023-11-17
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Comments and reviews: 22
Mickey
I need to get to grips with this stuff, as i'm in the process of doing exactly this. I'm adding two led's into a 12v circuit. I tried to keep things simple by using 12v led's, but at 20ma, i figure a resistor will need to be used. If i understand this correctly i don't, am i correct? .
Quite aside from the above, i would also like to dim the led's, as they are for panel illumination, so what you have explained here is extremely useful. The minimum voltage they will work with is 5v, so to adjust the brightness, i may mess around with voltage.
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I need to get to grips with this stuff, as i'm in the process of doing exactly this. I'm adding two led's into a 12v circuit. I tried to keep things simple by using 12v led's, but at 20ma, i figure a resistor will need to be used. If i understand this correctly i don't, am i correct? .
Quite aside from the above, i would also like to dim the led's, as they are for panel illumination, so what you have explained here is extremely useful. The minimum voltage they will work with is 5v, so to adjust the brightness, i may mess around with voltage.
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Techalyzer
The LED resistor never has anything to do with any calculator or formula in practical usage. A much lower value is usually needed to get the maximum amount of light. Which is quite obvious in the first example. At 3V, you will never need any resistor for any led. They all work perfectly fine at 3V.
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The LED resistor never has anything to do with any calculator or formula in practical usage. A much lower value is usually needed to get the maximum amount of light. Which is quite obvious in the first example. At 3V, you will never need any resistor for any led. They all work perfectly fine at 3V.
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Chris
When I was a kid maybe 10 or 11 and 38 now but I was experimenting with a red flashing LED and 9 volt battery I never put a dropping resistor and that battery lasted me about 2 weeks before the LED became dim. I don't know if it's because of the actual pulsing of the LED but it lasted for quite a while.
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When I was a kid maybe 10 or 11 and 38 now but I was experimenting with a red flashing LED and 9 volt battery I never put a dropping resistor and that battery lasted me about 2 weeks before the LED became dim. I don't know if it's because of the actual pulsing of the LED but it lasted for quite a while.
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Gabi
I just have finished an extremely simple passive pedal. I have added this led circuit to it. Everything works, except when the led is powered and i engage the pedal, i experience extra hiss. Are there any options for filtering this unwanted added noise generated by the led circuit?
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I just have finished an extremely simple passive pedal. I have added this led circuit to it. Everything works, except when the led is powered and i engage the pedal, i experience extra hiss. Are there any options for filtering this unwanted added noise generated by the led circuit?
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Joe
In the Ground, Neutral and hot wires video the wire that returned the current to the source was called the neutral and the ground was just the safety net but in this video its called the ground and there is no neutral mentioned? Im confused
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In the Ground, Neutral and hot wires video the wire that returned the current to the source was called the neutral and the ground was just the safety net but in this video its called the ground and there is no neutral mentioned? Im confused
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frankbauerful
Nice textbook problem. But what do I do in reality where I have an LED from a box of LEDs and that's all the information I have. My multimeter can tell me the voltage drop but how do I find out how much current the LED can take?
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Nice textbook problem. But what do I do in reality where I have an LED from a box of LEDs and that's all the information I have. My multimeter can tell me the voltage drop but how do I find out how much current the LED can take?
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Tiny
I love these videos, the graphics is so good these days. I wish I had access to info like this in my teens back in the 1970s.
All I had was ETI magazine, Practical Electronics and Hobby Electronics. Anybody remember Hobby Electronics?
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I love these videos, the graphics is so good these days. I wish I had access to info like this in my teens back in the 1970s.
All I had was ETI magazine, Practical Electronics and Hobby Electronics. Anybody remember Hobby Electronics?
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myles
I never calculated the value for Led mostly because most of my devices wouldn't last very long so I never found it necessary to calculate the value except for when I don't want outrageous Heat coming from the resistor
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I never calculated the value for Led mostly because most of my devices wouldn't last very long so I never found it necessary to calculate the value except for when I don't want outrageous Heat coming from the resistor
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Leonidas
Did you calculated only the resistor power consumption at the end of the video (whithout adding the LED consumption? just asking i'm an amateur, but interested in arduino stuff. Great videos, very helpfull: )
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Did you calculated only the resistor power consumption at the end of the video (whithout adding the LED consumption? just asking i'm an amateur, but interested in arduino stuff. Great videos, very helpfull: )
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MMC
I have a doubt
When a LED and a resistor is connected in series then why the resistor decreases the current flowed to the led
But when we connect two loads why the voltage is divided into the both loads
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I have a doubt
When a LED and a resistor is connected in series then why the resistor decreases the current flowed to the led
But when we connect two loads why the voltage is divided into the both loads
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ika
Question: Does the voltage drop equal to the required input voltage?
So for the example shown in the video with the 9V battery, could I just use a 2V battery with no resistor?
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Question: Does the voltage drop equal to the required input voltage?
So for the example shown in the video with the 9V battery, could I just use a 2V battery with no resistor?
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Keen
What if you don't have the current info and just have to go with voltage drop? How would you calculate this with missing info. Sorry, too tired to think lol. Thanks.
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What if you don't have the current info and just have to go with voltage drop? How would you calculate this with missing info. Sorry, too tired to think lol. Thanks.
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Серёга
Where is the promised 2: 24 explanation of combining the resistors at the end of this video?
I was asking this question 2 months ago and again now.
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Where is the promised 2: 24 explanation of combining the resistors at the end of this video?
I was asking this question 2 months ago and again now.
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Sierra
isn't 0. 126 W should be converted to 1/8 W? or is there something that i missed?
no offense, this is what i want to know about these lamps. Thanks; )
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isn't 0. 126 W should be converted to 1/8 W? or is there something that i missed?
no offense, this is what i want to know about these lamps. Thanks; )
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yas
i forget some of those things and making project 1 day ago and wonder how to calculate, you come in time to save me, ty for the great videos keep it up
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i forget some of those things and making project 1 day ago and wonder how to calculate, you come in time to save me, ty for the great videos keep it up
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The
The silver or gold bar is percent accuracy, so how do you figure that in to your select the better resistor? Does the led have the same standard?
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The silver or gold bar is percent accuracy, so how do you figure that in to your select the better resistor? Does the led have the same standard?
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Fish
2: 27 Your graphic reads Which power rating should the LED be, but you then you show the steps to calculate the power rating of the resistor.
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2: 27 Your graphic reads Which power rating should the LED be, but you then you show the steps to calculate the power rating of the resistor.
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Hedwig
Haha I calculate all of it correct, am I smart?
(Just kidding my calculator is the one calculate all resistance of the resistor)
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Haha I calculate all of it correct, am I smart?
(Just kidding my calculator is the one calculate all resistance of the resistor)
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Alae
why do we calculate the resistor voltage drop (9v - 2v = 7v )?
why don't we apply Ohms Law directly: 9v / 20mA. ?
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why do we calculate the resistor voltage drop (9v - 2v = 7v )?
why don't we apply Ohms Law directly: 9v / 20mA. ?
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Scooter
So to drive 2 LED's in parallel it would be 1v divided by 0. 04A for 25 ohms, eh. E= I x R Ohm, ohm on the range.
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So to drive 2 LED's in parallel it would be 1v divided by 0. 04A for 25 ohms, eh. E= I x R Ohm, ohm on the range.
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Jermanni
The moment you realize that he had the answer to the question input in the website right before the question
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The moment you realize that he had the answer to the question input in the website right before the question
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S.
Am a newbie and those type of videos with animations and maths are very helpful! thank you very much!
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Am a newbie and those type of videos with animations and maths are very helpful! thank you very much!
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