555 Timer Tutorial

[michaelkellyj77]

can u tell me how to make multiple leds blink at different times need help?????

[Peaceandwellness]

It doesnt work. Good luck ! Maybe china is selling bad 555s? Yep did it just like you and nothing but a lite LED, no blink! SOB

[Mrnitrocker]

Sir,

Thank u so much fr explaining it bt i hv a doubt in mind...

how can one control the frequency of the flashing LED??

kindly guide

[duendedanceboy115]

can you tell me what do i need to do this thing the stuff do i need to buy please thanks

[23000Taki]

Hey all, please i need someone to help me with my circuit... i ave 4 resisrots and 4 capacities and 2 lamps or (leds) and i have a battery 9V... and i have 2 diodes, so pls how can i conect them with NE-555 to the circuit????????? if some one know the answer pls contact me

this is my email : josh.fun@hotmail.fr

[Shroommduke]

Good job, it would be nice to know the value of the resistors and capacitor and maybe the calculation / theory / current etc

[silectronics]

You should always by-pass pin 5 with a .05 uf disc capacitor...it serves 2 functions...to eliminate spikes from the supply rail at the internal comparator during switching and smooths out the depletion layer delay during switching recovery at the internal discharge transistor at pin 7....it is a good practice to always by-pass that pin regardless of simplicity of circuit.. sometimes even simple circuits like this one gives you lots of unexpected outcomes.........thank you

[samuelmuentes]

Just what I was looking for. Thank you!

[mts133]

I got an electronic snapkit from radioshack and used it for this. you can use any resister and capaciter but the resister that connects pin 6 and 7 is the one that controls that blink rate. the lower k resister you use the faster it blinks! Hope this helps someone so I didnt just waste my time:)

[TheRealChx101]

@mts133 yes it did

[MrHowareyoudude]

hmm, why the led will not lights on when i ground the pin 4 with a jumper wire? need help asap at here :(

[Zyriden2]

im sorry but this does not explain at all what the pins each are and why, anyone who copies this video would now understand how to wire their own 555 timer from it

[unkzma]

hey i m working on electronic dice circuit do u have any video regarding to this?

[ObliviuxProductions]

You explain HOW but not WHY. =|

[ltdtadeo]

hola aka de mexico s , de que medida es el capacitor ,, ???

[eldechocolate]

las 2 resistencias iguales de cuantos OHm son?????

those 2 resistors how many K are????

[eldechocolate]

@eldechocolate 4 k LOL...

[securuslol]

wow, thx a lot man. This was really helpful

[Almahboal]

Thanks for your video, it is very simple and useful

[dotalessons]

"My fingers are too fat."

[HappyFatzKid]

@dotalessons Thank you, someone had to say it, I bout lost it.

[youTubinTimeTammy]

Awesome works perfectly!!!!

[MrLuis2493]

gracias esta chingon tu video saludos desde mexico, aver si puedes subir un tutorial de un dado electrico te lo agradeceria mucho , gracias

n_n

[HHOhybridBuilder]

Thanks for posting

[titoo3071]

youtube.com/watch?v=5jufhRq837­M

[boywithadolphin]

You forgot to fit a decoupling capaciter (about 10uf) across the power rails by the 555. Without it the timer is unstable.

[cosmicrdt]

you didnt really explain why you were doing what you did. Its like if I said this is how you drive a car and then just drove a car in front of you.

[209hii]

dude is it just me or is there no power supply?

[DarkAvatar1313]

@209hii

the two rows at the top and bottom of most breadboards are set to be power rails connect down it's length. So it's just off camera and he is connected to it via the rails

[purpl3guy]

Finally a video for a 555 circuit which is focussed!

[2010adb]

thanks for the answer

[2010adb]

how much voltage is he using??

[evhgl87]

@2010adb depends on the chip, some datasheets spec 3.3V absolute ratings, others spec 20V and up, all depends on your individual needs as all a 555 timer is internally are two differential amplifiers which are more accurate BJT's wired as comparators. normally i use 5-9V on a 12V rated 555. never go above absolute maximum, that is the o-shit moment.

[edwardfastcutter]

question using 555 time for touch circuit, when energized it works 50% of the time, the components are sodered into place and between 7 and 8 there is no resistor so i can use it as a latch. so when I touch it it remains energized across pin 3 until it is powerd off.

[Saturn364]

Thank you very much for this explanation I would like to know if this circuit is suitable for 90 LED s ?

[nmelec]

@Saturn364 Yes, however, with a load like that you should use a transistor. If all you need to do is switch leds only on or off (or dim using PWM); for this mode of operation (the most common one for 555 timers) use a MOSFET transistor. If you plan to dim them by analog signals (uncommon with 555 timers) you should use a Bi-Polar transistor.

[scientist375]

@nmelec dude, u can flash 90 leds, using an arduino also

[Adrienn757]

C'est normal que sa marche pas pouvez vous mettre les puissances des resistance du condensateur car la o a aucune indication cela ne fonctionne pas c'est normale

I'M FRENCH

[28january91]

hey can i ask, what's the function of 555 timer in a dark sensor circuit which uses LDR & NE555...

[nillmats]

now i know hehehe

[MrStemkilla]

can anyone tell my why caps have polarity? they are really simple thing and i really dont understand why the way you hook it up would chang anything

[deeaks1]

@MrStemkilla only electrolytic caps are polarized. if you hook them up backwards, the dielectric is damaged and the capacitor ceases to function. for more info, see electrolytic capacitor on wikipedia.

[MrStemkilla]

@deeaks1 but if you look up how they are made it is just 2 metal plates wraped around eachother not tutching thats stores energy. this means it should be ablke to run backwords with no counter effects

[209hii]

@MrStemkilla google "semiconductor p-n junction" basicly the two sides of the capacitor are made from diffrent materials to maximize flow. current running against it would defeat the purpose and also damage the materials the plates are made out of

[jimmyabro786]

how we can calculate the timing of led flashing??

[nmelec]

@jimmyabro786 You can google "555 timer simulation" and that will get you to a couple good websites

[jimmyabro786]

@nmelec Bro am not saying about the similation which will be made in multisim , am saying about the how we can calculate the flashing timming any method or rule.......??

[joluias]

@jimmyabro786 the time period is the large resistors value * the capacitor value

[jimmyabro786]

@joluias means that T=R*C..... if am using the highest resistor value 1k ohm, i multiply the value of resistor or the voltage which is in resistor 1k ohm ???

[Cassius720]

Wait, did you say that both rails are positive? That confuses me. I thought that one was positive and on was negative.

[CoreyTheWolfTWC]

what color stripes are on the resistor ? yellow black red ? 

[ericbrow123]

Ok..I have a question. I bought a digital speedometer for my car, and the mileage is lower than what my car has. I was told I need to make a 555 timer circuit to hook to the speed sensor wire to make it think it's being driven, increasing the mileage. Where would I hook this wire in at? Would it be in place of the LED light?

[davidsalomongp]

How do you know the capacitor's value you need?

[nmelec]

@davidsalomongp There is really no definite value, use a high rated capacitor for a slow blink and a small one for fast blink, try a couple different ones bandits up to you which one you like best...all that the capacitors do are control the blinking speed.

[davidsalomongp]

@nmelec Thanks for the fast response.

By the way, how do you know what resistance size you need? I know the size of the LED resistance but I don't know why I need two 4k resistances and not any other value.

[nmelec]

@davidsalomongp the resistor can dramatically affect the way a circuit acts and 4k seemed to be the best for this.

[PrimusTool]

@nmelec, considering T1 is period of LED off, and T2 is period of LED on; R1 is resistor between 7 and positive (pin 8), and R2 is resistor between 6 and 7 pins, C is the capacitor:

T1 = 0.693 * (R1 + R2) * C

T2 = 0.693 * R2 * C

[jimmyabro786]

can some help me mine led is flashing but it is dim........ don't know why it is dim can some one tell me!

[5445252]

@jimmyabro786 try a smaller resistor for the led

[pauloricca]

Hey, just a comment. in my personal opinion, you're tutorial isn't very helpful because you basically just say what connects to what, but not why the connections are made. instead of watching this I could just follow a schematics which would be clearer, cleaner and quicker. don't get me wrong, it's cool that you do these tutorials, but some more info would be cool :)

just my 2c

cheers

[Pictor100]

Thanks for the tutorial, it was very helpful. The circuit I assembled according to the instructions didn't work at first. I switched out the capacitor for a larger value, and then it worked perfectly. Turns out the 0.1μF capacitor I originally used wasn't big enough to charge and discharge properly, so the LED simply lit up and was rather dim, and didn't flash. A 470μF capacitor did the trick!

[nmelec]

@Pictor100 the reason your led was dim is because the led WAS actually flashing but charging and discharging so quickly you could not see it. That effect is called pulse width modulation (PWM) there is a lot of potential in that.

[jimmyabro786]

@Pictor100 wel bro same prb with me that i had used 0.1uf and 1000uf but led just on not blinking, what value of capicitor u had used???

[Pictor100]

@jimmyabro786

I used a 470 uF cap.

[jimmyabro786]

@Pictor100 Ok thx bro, wel when i had created the diagram of this circuit in muti-sim it shows some error , error was about node 6 of IC, coz we had connect node 2 with node 6 also we had connected node 6 with 2.2k ohm of resister with the +ve terminal of battery..... can u tell me how can i solve this prb of node 6??

[gmc990]

sweet tut i like it, got my circuit working but when i tried it like the 6th time it wouldent work, i tried a different 555 ic, checked the voltage of the battery changed resistors but nothing. any ideas why??

[gaussman08]

join pin 2 and 6 it isn't necesary ._.

[majorgray3]

This was a simple enough to help me get started with the 555 timers. Thank you very much for the help.

[janagyjr1978]

An okay tut. I don't understand why the conservation of wires. I'll have to provide my TinyCAD drawing for my circuit tomorrow. Subscribe to my channel for a bulletin when I do.

[nmelec]

@janagyjr1978 The reason for the small amoujt of wires is because it is a lot easier to tell apart commections than with a messy mass of wires.

[janagyjr1978]

@nmelec I can understand that, but as you go along it shouldn't be that much of a concern. Still enjoyed the tut.

[nmelec]

@janagyjr1978 thanks

[pjharro]

@janagyjr1978

Dude, he's doing a tut, don't u think it might be easier for ppl to see whats going on if it doesn't look like spaghetti?

[daniiiaLi]

where did you get the power source from? I have a battery and I dont know how to connect it

[LenWhistler]

@daniiiaLi

Buy a battery holder for 4 or 6 AA batteries, and buy a 9 volt battery clip for the battery holder.

[renniweht]

Didnt work for me.

[aethan2]

@renniweht worked fine for me