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Old 3rd August 2004, 04:57 PM   #1
Atic is offline Atic  Portugal
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Join Date: May 2003
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Default Help newbie on electronics

Hi everyone!
Im now on my way for the 1st experience on electronics. I also read a few things on a book.
What i wish to know is can i put toghether 10 5mm blue or white led connected on paralel using common car bat or do i need a resistor for evey single led?
And on the final look will the input have enough power to make all the led bright? I think so but...
Thanks everyone!
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Old 4th August 2004, 05:19 PM   #2
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Default Easiest thing to do

The easiest thing is to use a separate resistor for each LED. However, you can but 2 or 3 in series and use one resistor for each group. Just don't put them all in series and these LEDs sometimes need fairly high voltage, for LEDs that is. Maybe 3-4 V each.

As for value, that depends on how much curremt you want to pass through each LED. There are many other threads on this site telling you how to size the resistor needed for LEDs. Do a search.
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Old 5th August 2004, 11:08 AM   #3
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Join Date: Jul 2004
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I can second the above.
The voltage the leds need depend on the colour of the emitted light.
You should get some data on your leds!
red leds e.g just need about 2V.

Like dmfraser said, best is to use several in series (maybe 2 if blue, 4 or 5 if red) and a resitor to limit the current to about 20mA (better not more than 30mA or the lifetime will be reduced) .

And then use several of those series in parallel.

You'll certainly find lots of sites about the subject if you search in google...

Have fun!
Dominique
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Old 10th August 2004, 05:08 PM   #4
Atic is offline Atic  Portugal
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Join Date: May 2003
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Im having great fun.
Thanks for all the info so i must re-search here for some more things..
I think this is the only forum with reliable info and serious answers KNOWN TO MAN!
THANK YOU!
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Old 18th August 2004, 04:38 PM   #5
Atic is offline Atic  Portugal
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Join Date: May 2003
Location: Lisboa
Just found some more stuff. And now i have some more doubts...i hace a 220 000 MF capacitor but not sure how i make this just F. Is it 1x10^-6?

Its an electrolitic with 2,5 cm diameter
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Old 18th August 2004, 08:12 PM   #6
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Join Date: Jul 2004
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isn't it rather 220 000uF ( uF means μF, I guess u is used because the μ wasn't easy to find on typewriters and computers in former times)

That's a big value for an electrolytic! Is ist a goldcap? Rated for 5.5V?

1000 uF = 1mF
1000mF=1F

Cheers
Dominique
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Old 18th August 2004, 09:19 PM   #7
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Join Date: Dec 2003
Location: Orange County, CA
Default F Symbol

To get the symbol, hold down the ALT key and type 230.

To get use ALT 248.
To get type ALT 241.

Explore for more between ALT128 and ALT 255.
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Old 19th August 2004, 06:57 PM   #8
Atic is offline Atic  Portugal
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Join Date: May 2003
Location: Lisboa
Im sure they used MF with both capital. Its metallic grey not gold. Quite big...

Tahnx ALT+Man! Great tip!
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