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Electrical geniuses Unite!
I need a hand with something.
I need to wire up 3 blue LEDs to a standard 9v battery. It must also have an inline switch.
I've tried Google but its all about LEDs wired to your computer or to your car so its a whole different ball park to what i need.
Can it be done and how? Please use basic terms as i'm not experienced with DIY electronics.
Thanks in advance 
Just simple live and neutral connections aint it?. and obviously i think u will have to loop the led's together?!
then wouldn't you just need to take the LEDs and connect their wires directly to the battery? like + to + and - to -? i did something like this when i was in grade school...go science fair!
But i'd want a switch and i have also been told i'd have to put in a resistor.
what is this for? it sounds ALOT like what i did in grade school lol
take a regular light swtich and hook up the LEDs to one side...then take the battery and hook it to the other side...switch goes on, currents open and power from the battery flows to the lights?
you need to know what the input requirements are on your LED's to know if you need a resistor or anything like that.
totally off topic BUT Jackson u make up a shitload of threads.
| quote: |
| Originally posted by aka "O" totally off topic BUT Jackson u make up a shitload of threads. |
.......
Errr I'm so embarassed as to which way would be best to cable this .... Parallel or Serial? I think Serial. Not doing much electrical theory in a while makes you rusty
So basically here goes easy as pie:
-0-
| |
-0-
| |
-0-
| |
| |
/ |
| |
+ -
/ = switch
Looks simple enough to me Jdat, thanks. No resistor though? will this be ok?
| quote: |
| Originally posted by Jackson Looks simple enough to me Jdat, thanks. No resistor though? will this be ok? |
| quote: |
| Originally posted by Jackson Looks simple enough to me Jdat, thanks. No resistor though? will this be ok? |
). I can't think what vaule you'd need but basicly in the order of k ohms probebly. The better you pick the value the brighter the LED i'll be probebly. Whats this for btw?
>>> LINK <<<
+====Switch=====LED====Resistor===-
You were up late Dervish!
My dad was talkin about it. He was wondering about making a moonlight affect on a coral reef aquarium.
Do not connect them in parallel, use a serial circuit. The reason for this is that the LEDs might have different operational voltage drops and they would each draw a slightly different amount of current resulting in slightly different brightnesses. In serial, they all have the same amount of current running through them.
The circuit should look like this:
+ ---[Switch]---[Resistor]-- +[LED1]- -- +[LED2]- -- +[LED3]- --
[9V]
- --------------------------------------------------------------
The order doesn't really matter, but make sure that the LEDs are in the right way (they have +ve and -ve ends) or they won't work. Typically, the longer lead is the +ve one.
The resistor is needed to ensure that the LEDs don't draw too much current. The best way to find out is if you have the LED data sheet. Find out what the operating current (I_L) and voltage (V_L) values are. Then do (V_s - 3*V_L) / I_L = R. Find a resistor that's close to (but greater than) R.
LEDs typically require V_L = 2 V and I_L = 20 mA. V_s = 9 V in this case so R = 150 Ohms.
Note: Blue LEDs require 4 V usually. You would need another 9 V battery if this is the case. Once again, this information would be in the data sheet.
PM me any questions, I would be glad to answer them.
Disclaimer: I am NOT responsible for any damage or personal injury caused by following these instructions.
| quote: |
| Originally posted by Jackson You were up late Dervish! My dad was talkin about it. He was wondering about making a moonlight affect on a coral reef aquarium. |
You may already know, but as LED's are diodes the current can only flow one way through them so they need to be connected the right way round.
And as far as I can remember from my Electronics A-Level (a couple of years ago) the short leg is negative and the long one positive.
Dont worry about personal injury. I'm sure a 9v battery wont do much damage
Will i need a circuit board to attach everything? And would i also need a soldering iron or is there another way?
You can use strip/vero board you cut out (remove) connections using a dill bit even (ment to use a special tool, big drill bit does the same job though). Your probebly easiest to use an iron (I got a cheapo shit one from argos with all the other stuff for <�20, maybe borrow one?).
I've had 1,000 volts through me at one point, current limited though, just makes you look like a mong
Hmmm, i saw some kits on ebay (i'll try to find a link) for Radio controlled cars. Everything is wired and ready to go with a switch. Its was �7-50 i think. Only problem is that the cable length might be too short, would it be fairly simple to just lengthen the cable?
No matter, i found someone on ebay that makes LED headlight units for remote control cars. He said it'll cost me about �6 including postage and will be delivered by Monday!...I know that may be expensive for the parts but i would have to buy all the equipment (soldering iron) if i wanted to make it myself...and i'd still probably bugger it up 
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