Fade away LED circuit using a capacitor. Electronzap step by step build and schematics.
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- เผยแพร่เมื่อ 12 มิ.ย. 2016
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Capacitors are often used to make the light from an LED fade away instead of turning off instantly. I show how to make a circuit that does just that.
#LEDs #capacitor #electronics - วิทยาศาสตร์และเทคโนโลยี
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www.twitch.tv/electronzap I now do my gaming, Fallout 4 for the time being, on Twitch.
Capacitors are often used to make the light from an LED fade away instead of turning off instantly. I show how to make a circuit that does just that.
I like this a lot. This is the simplest, most well illustrated circuit that is as close to what I want as I've seen yet. I would like it to come on a little quicker, and fade out a tiny bit longer, but I can live with this. Thanks so much!
Glad to hear! Thanks for watching!
Thank you for these videos. I skimmed over these fundamentals years ago and am now having to go back and truly learn the basics.
Thanks for watching!
This is one of the few videos that doesn't show a stupid fade on fade off blinking circuit. Thanks for providing me with this info.
Glad you enjoyed!
Very handy, it worked after 1st try. Nice that you implemented a diagram. Most ppl dolt include that and do it very fast, you took your time which helped me. Thanks!
Glad to hear! Thanks for watching!
electronzapdotcom no problem ;)
Exactly what I was looking for, And guessing I would find...
But finding your Very straight forward demo not so easy , THANKS
Glad to help and thanks for watching!
Prob spent 20 minutes looking for this easy answer.
How to Slow dim and off feature. with a cap right???
even my friend who is very knowledgeable couldn;t just ack
I learn and forge and learn some more, this will stick.
Jen Elsworth said fail to learn... and big Clive keeps me amused.
Thanks again, I subscribed!
Great explanation - and no fluff! Every part of it was valuable AND I understood it all. Nice work!
Glad to hear, thanks for watching!
@@Electronzap - Sure thing! I’ve seen a bunch of your videos and you explain things REALLY well. The vast majority of electronics tutorial channels either assume too much knowledge or not enough, but you found the “Goldilocks Zone”.
I also like the combination of referencing schematics and building it on a breadboard. That’s VERY helpful to me!
Thank you! We make more experiment based on this. Help to my son understand the concepts.
Glad to hear, thanks for watching!
Great video! Thank you, just what I was looking for.
Glad to hear, thanks for watching!
Easy but very informative.
Thanks!
Great super simple video !!!!!!
I rewatched this video alot but when I got it it was very very useful thanks
Glad to hear, thanks for watching multiple times!
nice and simple circuit! 👍👍 Thanks!
Glad to hear, thanks for watching!
Gee 7 years youve been doing this for a while now 47k views congratulations
Yeah this video hasn't done bad. thanks for watching!
Thanks! It worked!
Glad to hear, thanks for watching!
Great video, how to accomplish the fade in as well?
will this work to led stripe 12v ?
Here of the brazil very good your circuit
What capacitor do I have to use for a car halogen bulb....12v 100watts in order to make that exact fade?
Will this also work in a 120V ac circuit???
Great video. The way you explain is perfect. Literally a video to model after. Very impressed by you.
Glad to hear, thanks for watching!
Literally the circuit I was looking for. If only the start up was immediate instead of fade up 😂
Does it matter if I switch the negative lead instead of positive?
really well commented
Thanks!
Hi sir. I replicate it and did some modification to it by putting a 10v 680uf capacitor instead to fade the led faster. instead of the push button you have, i use a ttp223 touch sensor, but for a reason i can't tell, my led fade on but not off. i can't find any answers out there. I am hoping you can help me if possible.
If you had a voltage supply that matched the LED could you drop the resistors and just use a capacitor?
You can light an LED with a bit less voltage than it's maximum forward voltage and no resistor. But of course it is easy for something to go wrong and the LED could burn out, so not recommended. The capacitor's voltage will also be barely enough to light the LED, so it's voltage will probably drop too low to light the LED almost instantly as soon as the supply voltage is removed.
Awesome
Thanks!
Can this work with negative trigger of car unlock as i am looking to make 2 separate led cob to light up on unlock n lock trigger which is negative output and fade out slowly after the trigger
Not sure unfortunately.
@@Electronzap ok tks nyways
Realy nice video!, Do you think we still need resistors if we use 3v battery?
Some people light LEDs directly with coin batteries. Probably not good for the LEDs, and there would be no fade.
@@Electronzap ok,thank you for your answer😁
Hello, worked ! Thanks a lot. I had tested some other explanations that didn't worked for me, and now I know why: The last resistor from the negative connector of the led to grounding wasn't included (or so I remember). But I don't understand why it is necessary, and why if you don't include it, the led turns off immediately.
Well well well... After some more testing I can say I was wrong: The RED led turns off gradually very fast (almost unnoticeable without oscilloscope), but with the resistor plugged in, it turns off more slowly; Why ? Maybe because the amperage is lower because of the final resistance is present, isn't it ? Also, with a green led and without that resistance, the led turns off more slowly... Maybe because the 'internal resistance' of the green led is greater than the one of the red led ?
Would a 100volt 3,700 or 5,000 or 10,000 Farrad capacitor be dangerous ? I need 100volt because a bicycle bottle or hub dynamo can output up to around 100 volts ac on very fast down hill decents. I plan to use it to make a full wave bridge rectifier as a smoother for my vintage bicycle dynamo lights to stop the very annoying strobing that occurs with the AC & to hopefully enable the light to glow for a few minutes when stopped at traffic lights when the current from the dynamo is no longer flowing - the capacitor discharging into the load ( a 3 watt total of front & rear led bulbs). How long could I expect the lights to glow for before going out completely with these value capacitors please?
100 volts is always dangerous. 1 Farad can provide 1 amp of current per second, for each volt that it is charged to, wheras it takes 1A of current 1 second to charge it 1 more volt higher. Trying to build something to capture energy and then reuse it isn't a simple build at all, even though the basic concept is pretty simple. You'd have to look at what other people put together to learn all the details. Capacitors aren't cheap either, they genetally only compete with batteries when there needs to be a lot of current for very short period of time.
@@Electronzap 😮😅 That would fry me if something went wrong lol! My bad - I'm a novice. I meant 100volt 3,700 or 5,000 or 10,000 microfarads
-- symbolized as µF not Farads. A different ball game now I hope? Bicycle dynamos (actually alternators) are constant current sources if I understand it correctly rated at 6volt 3watts but the voltage increases with speed up to around 100volts on rare occasions if able to achieve 40mph on long steep descents.
@@Electronzap Okay, so now I have learned a bit more... If I used a 1.5 Farad (not uF - Microfarad) 5.5volt Super Capacitor or two of these (total 11volt & 3 Farads) to discharge into the load when the power from the alternator stops (The load is two Led Bulbs total 3watts - Headlight up to 2.6 watts & the tail light 0.4 watts) will the Super Capacitors smooth the ripple just as good as an electrolytic capacitor in the Full Wave Bridge Rectifier that I make using shottky diodes or passive Mosfet?
I have tried the above series and it works,
when the button is released the effect fades from 100-20% so the timing is perfect according to my wishes, but when it reaches 20% it feels like it is stuck, and the process fades to 0% it takes a long time.
when i try to shrink the capacitor the effect fades out 100-20% too fast
how to solve this?
I'd wire the capacitor as a voltage ramp, and then use a voltage follower (probably using a single supply op amp) to transfer that voltage to the LED.
im completely newcomer about all of this stuff,right now im working on some diorama that would lit the eyes of a monster slowly when turned on and fade out slowly when power is gone,any simple idea or changes from your circuit? (sorry about my grammar) :)
That's probably a common project that people share online if you do a google search for "fading LED monster eyes" or something. This is pretty much the setup I would use if trying to keep it as simple and easy as possible, but I would have parallel LED circuits controlled by a single switch to light both eyes at exactly the same time. Thanks for watching!
thank you,ill try to digging more :)
I think I'm going to use this on one of my computers that doesn't have a fading LED.. the LED just hard blinks when it's sleeping.
Nice video! but what's the point of having a LED light fade away instead of turning off at once?
I think it looks cooler, but mostly LEDs are a way to see how much current is flowing. Which I think also helps people be able to visualize the current changes in similar circuits without LEDs.
@@Electronzap Ahh I see okay because I'm searching what's the use of having a component that charges and discharges quickly...like why is that so useful in DC devices?
@@Electronzap it does look cooler! I am building a light board right now, 120Vac, I want to add a capacitor to the push button switch, so it will fade out.
5 40 watt bulbs is the first circuit I want to test!
Will this work for AC? 120V? Obv different size cap
For 220v power supply can you can help with an advice?thanks
I don't do anything with high voltage and very little with alternating current so probably not :(
electronzapdotcom thanks.Good job!
Why not use one resistor only? The one serial to the LED?
Daniel F you can. An uncharged capacitor conducts like a short circuit, at first, when it starts charging though, so you have to be careful, especially as capacitor value goes up.
electronzapdotcom got it. But it's ok in this case, as you're working with low voltage, right?
The voltage is more than enough to cause problems. I've heated metal wire enough to melt/burn plastic at much lower than 9 volts from a steady short circuit. the small value of the capacitor (470uF) is what keeps the total current very small. I'm guessing that the switch will probably mechanically wear out long before any and damage from such a brief short circuit and I'll often omit the resistor. There is also a possibility that I may accidently short circuit the capacitor somehow, or accidently attach both sides of the switch directly to the power source. These things happen a lot while I am making changes while recording and it helps when I use a resistor to space things apart.
electronzapdotcom got it now. Thank you, sir!
Thanks for watching!
How many LEDs can be used?
In series, you can use as many LEDs as you have voltage. More LEDs = more voltage needed. Don't exceed the capacitor maximum voltage though. In parallel, each LED is going to discharge the capacitor faster. 2 times as fast if you use 2 parallel LEDs with their own resistor (recommended). 3 times as fast for 3, and so on.
Can you help me turn this into a circuit board?
I don't make circuit boards. So unfortunately can't be of much help.
so... what is the use of the other switch??
The pins on these switches are kind of hard on the breadboard slots, so I would leave them in place. Some circuits I made needed 2 switches, so I always left the 2 switches there.
@@Electronzap okay... kind of confusing to me at the first place... 😁
Hi, i wanted to do this exact same thing but for the headlights in my car. Do you think that would be possible? if so could you do a video tutorial or provide some guidance? Thank you
Unfortunately I don't really do anything with vehicles and I don't have a shop yet so I'm stuck working in a tight space and small scale projects for now. But, I would bet that a number of auto enthusiast TH-camrs have shown projects like that. Some company(ies) probably make an easy to attach unit that you just plug right in.
@@Electronzap you only have to scale to 14vdc
You need a delay on break type circuit, not capacitors. Someone might make something like that aside from it being standard on some newer vehicles via the computer. Google 12 volt delay on break.
Awesome video. I need some help building a similar curcuit. I have made a trigger for a 12v 1A LED light strip. I have installed this in my drums and it works well when I strike the drum. I need to make the light come on instantly and then fade out in one Second. I have a Yahoo email. Thank you from LudwigClassics
That's a good idea for a circuit. I would do a Google search for noise activated fading light schematic diagrams.
Took me a while to get this down couldn’t figure out what I was doing wrong until I realized that the resistor wasn’t connected in the same slot as the switch lol
Annoying when that happens lol. Glad you got her working!
Can someone assist me in a project? I wanna make a circuit that will power many led strips and have a fading on and off effect.. Any help appreciated.. Thanks
You could use a 555 timer to charge and discharge a capacitor while lighting parallel LEDs. If there's too many LEDs for the 555 timer alone you could have the capacitor control a transistor that powers the LEDs.
What transistor should i use in the circuit? And FYI i wanna power 4 12v led strips, i really don't know the wattage. And thanks for the info.
Is this Norm Macdonald?
Sounds like it!
@@Electronzap cool video though man, it helped me out!
Glad to hear! Thanks for watching!
I think that perhaps nine volts are too many for that LED.