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 Post subject: LED battery and power
PostPosted: 03.08.2002 04:35 
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Junior Modder
Junior Modder

Joined: 03.08.2002 04:30
Posts: 22
Hey there, i am new to your site, and i am trying to make my own glowpad. I know very little about electricity, and was wondering if you could help me out a bit.

I bought two blue LEDs from radio shack. Here are the stats:

5 volt
30 mA
300 mcd
forward voltage 5.0 typ 6.0 max
peak emission wavelength: 430 typ.
viewing angle : 24

I was wondering if it would be possible to hook two of these LED's up to a 9 volt square battery or 2 AA batteries, for temporary power. if so, could you supply me with some forumulas to use to calculate the resistors needed and such....

also, can i hook these up linearly?

thanks alot.

Jonathan


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 Post subject:
PostPosted: 03.08.2002 10:05 
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Site Admin
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
with two aa batteries just connect those batteries in series so you get 6 volts and then but those leds in parallel so each of them will get that 6 volts.

With 9 volt battery you might try connecting the leds in series and then hooking them up to battery. The leds will only get 4.5 volts each but that might be enough. It doesn't take as much current this way and battery lasts longer but it might be too dim. Just test.


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 Post subject:
PostPosted: 03.08.2002 17:57 
japala wrote:
with two aa batteries just connect those batteries in series so you get 6 volts and then but those leds in parallel so each of them will get that 6 volts.

With 9 volt battery you might try connecting the leds in series and then hooking them up to battery. The leds will only get 4.5 volts each but that might be enough. It doesn't take as much current this way and battery lasts longer but it might be too dim. Just test.



just to clarify.... hooking the leds up in parallel means to put the leds next to each other, positive to negative

Image
----------------------------------------

and in series means this?(except with a 9 volt battery)

Image


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 Post subject:
PostPosted: 03.08.2002 21:59 
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Joined: 24.01.2002 10:09
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No, they are just the opposite. :) + to + and - to - is parallel connection and +-+- is series connection.


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 Post subject:
PostPosted: 04.08.2002 06:46 
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Junior Modder
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Joined: 03.08.2002 04:30
Posts: 22
hmm like this?
Image


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 Post subject:
PostPosted: 04.08.2002 11:12 
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Veteran Modder
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Joined: 15.04.2002 18:52
Posts: 671
Location: Tampere, Finland
No...

Code:

:~~~[+ BATTERY -]~~~[+ BATTERY -]~~~[- LED +]~~~[- LED +]~~~:
|                                                           |
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~'

~ WIRE



I hope that this clears this thing a little...

_________________
» AkiKorhonen.org » AK @ ModGallery / AllTheMods »


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 Post subject:
PostPosted: 04.08.2002 16:15 
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Junior Modder
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Joined: 03.08.2002 04:30
Posts: 22
ahh thanks ak. but it still isnt working. heres what i think is going wrong...

japala said:
Quote:
with two aa batteries just connect those batteries in series so you get 6 volts and then but those leds in parallel so each of them will get that 6 volts.


aa batteries have 1.5 volts, not 3. so how do you put them together to get 6 volts? if i am using two aa batteries, i should get 3 volts right? that wont be enough power to light up 2 LEDs right?


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 Post subject:
PostPosted: 04.08.2002 16:27 
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Junior Modder
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Joined: 03.08.2002 04:30
Posts: 22
aight hang on, i tried with 4 aa batteries, and the leds glow. they arent very bright...if i add more volts, will they glow brighter? or is that the brightest they are gona get?


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 Post subject:
PostPosted: 05.08.2002 11:45 
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Joined: 24.01.2002 10:09
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Location: Finland
hehe, don't really know where I took that 3 volts from for that battery. :)

If those leds need 5 volts as you said and you connect them in series you would need 10 volts to get their specified brightness. That means at least 6 * 1.5 volt batteries and still it's short by one volt. By connecting 4 * 1.5 volt batteries in series and then connecting those leds in parallel to the batteries, each of the leds will receive 6 volts and they should be quite bright.


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 Post subject:
PostPosted: 05.08.2002 14:38 
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Junior Modder
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Joined: 03.08.2002 04:30
Posts: 22
hehe i gotcha, i tried it with a 9v battery, and it works fine. all i need to do now, is get some plexi glass and start cutting. i'll let you know how it works


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