555 Timer Tutorial

How to put together a simple 555 timer circuit.

Category:

Howto & Style

Tags:

• 555
• timer
• cmos
• paralax
• digi
• key
• time
• second
• restsor
• blink
• tutorial
• flash
• led
• green
• lm555
• ne555
• lm
• ne
• bike
• light
• synthesizer
• howto
• bread
• board
• breadboard
• DIY
• how
• to
• tut
• video
• vid

[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.

[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

[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:)

[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.

[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

[TheRealChx101]

@mts133 yes it did

[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

[scientist375]

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