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 Tutorial: LEDs: Pulse (aka "Fade in/out") using 555 Timer IC

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Kuu


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Related to my "Library" post.  http://mandalorianmercs.org/forum/index.php?topic=76666.0

One of my Vod'e in Murraan asked about a backpack mounted "beacon." So I was thinking this would be a great circuit for that (maybe increase the number of LEDs / change the smaller resistor to make it brighter).

Pulsing or "Fade in/Fade out" LED using a 555 Timer IC
https://www.youtube.com/watch?v=qLAi7hkDuYw

The poster uploaded a schematic (I never learned to read them!  :P )


Parts List (correct me if I incorrectly recorded something)
-----------------------------------------------------------------------
breadboard (a small one will do)
some lengths of 20g coated wire
LED (ultra bright)
555 Timer IC
1000 uF (microfarad) capacitor
150 ohm resistor
1200 ohm resistor
a transistor (video is a TO-18/2N2222A NPN transistor with the metal cover, but I think a TO-92/P2N2222 NPN with the black plastic cover should also work fine)


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| aka "Matt R." | Helpful Stuff |Facebook | VRCA #053 | M.V.S. #10 | B.E.A.R.D.S. #77 | S.P.A.R.C.K. #2 | OM: Sept. 20, 2014

Ahn'vil Burk'yc


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Re: Tutorial: LEDs: Pulse (aka "Fade in/out") using 555 Timer IC
« Reply #1 on: May 22, 2014, 06:52 AM »
schematics are pretty easy to read.

Wiggly lines with a number next to them : Resistors ( ex above = 150Ohm resistor, 20kOhm resistor, etc )
The symbol with NPN next to it is a Transistor ( basically a switch controlled by electricity, 2 kinds like the example above, NPN and PNP, look into google for more info ).
The symbol with 220uF next to it is a Capacitor, this has a + and a - side, BE CAREFULL when you solder this in, it can pop when you put electricity on it on the wrong side ( if you attach the + of your battery to the - of the capacitor ), although you'd have to have a big enough capacitor and a large enough power supply to have that, BUT STILL BE CAREFULL!!

That arrow that is attached to leg 1 of the IC ( and the bottom arrows ) is to indicate that is where the ground is attached ( basically the "-" of your battery ).

Hope this helps a little :)

Kuu


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Re: Tutorial: LEDs: Pulse (aka "Fade in/out") using 555 Timer IC
« Reply #2 on: May 22, 2014, 11:30 AM »
Helps a lot! Thank you!

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| aka "Matt R." | Helpful Stuff |Facebook | VRCA #053 | M.V.S. #10 | B.E.A.R.D.S. #77 | S.P.A.R.C.K. #2 | OM: Sept. 20, 2014
Re: Tutorial: LEDs: Pulse (aka "Fade in/out") using 555 Timer IC
« Reply #3 on: May 22, 2014, 02:57 PM »

The symbol with 220uF next to it is a Capacitor, this has a + and a - side, BE CAREFULL when you solder this in, it can pop when you put electricity on it on the wrong side ( if you attach the + of your battery to the - of the capacitor ), although you'd have to have a big enough capacitor and a large enough power supply to have that, BUT STILL BE CAREFULL!!


Just to embellish this a little further...that is an electrolytic capacitor which does require the correct polarity....the -ve leg of the component will be accompanied by a band(usually grey) on the component.

A ceramic capacitor doesn't have a polarity....it can be mounted either direction.

Ahn'vil Burk'yc


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Re: Tutorial: LEDs: Pulse (aka "Fade in/out") using 555 Timer IC
« Reply #4 on: May 22, 2014, 03:02 PM »
Quite correct Vod!

Example of electrolytic capacitor :

Note the grey band indicating the Minus leg.

example of a ceramic capacitor:

No indicators of + or -.

Re: Tutorial: LEDs: Pulse (aka "Fade in/out") using 555 Timer IC
« Reply #5 on: May 28, 2014, 06:13 PM »
If it helps, I have a circuit symbol chart on my site-
http://www.vaevictis.co/tools/circuitsymbols.html

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Re: Tutorial: LEDs: Pulse (aka "Fade in/out") using 555 Timer IC
« Reply #6 on: Jan 15, 2015, 10:06 AM »
I have built this circuit but it don't work, after that I did a simulation and got the same result. The left LED flashes for a short moment and after that the right LED is glowing all the time. Does anyone know how to modify the circuit that it works?

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