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PostPosted: 13.01.2005 10:47 
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Junior Modder
Junior Modder

Joined: 19.09.2004 07:14
Posts: 10
i finished the birthday present. here are some sample pictures.
i have all the pictures, and some videos on my website at:
http://www.thomashuang.net/lights/light.htm

Image
Image
Image
Image

thanks for everyone who helped.
please post any comments.

oh, it didnt work at first, it would just stay on and not fade. so i reduced the resistors at pin 2 - 7 to 23.5Kohms and it started to work. I also used 94uF capacitors. Would it have made any difference if I had used 47Kohms and 47uF? Would the timing be the same?


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PostPosted: 13.01.2005 16:35 
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Site Admin
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Looks great. Remember to send it to ModGallery too. :)

As the timing of the whole thing is determined by the relation of that capacitor and the resistor, the three times bigger cap will need (as you already found out) a smaller resistor. This works the same in other direction. There is also a limit how high/low values one can use but the right values can usually be found with some trial and error.

You can calculate the value of the time base for RC circuit with the following formula:

Code:
t= 1.1RC
t=time-out time(sec), C=Capacity(F), R=Resistance(ohm)


For example 100Kohm resistor and 30uf capacitor like I used in my article would result to a time of 3.3 seconds. This is not an exact value by no means but should give you some indication on how the value of the resistor can capacitor are linked together.

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