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OfflinePsillyNilly
Stranger
Registered: 10/15/04
Posts: 831
Last seen: 11 years, 7 months
Do I have to use a resistor for each LED or...
    #3289921 - 10/28/04 05:14 PM (12 years, 11 months ago)

I am connecting LED's to a costume for haloween and I am running them off a 9 volt power source. I know the ohm resistor I need for the lED's but can I just put 1 resistor inbetween the battery and string of 10 leds or do I need a resisitor for each LED?


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Invisibleluvdemshrooms
Two inch dick..but it spins!?


Registered: 11/29/01
Posts: 34,234
Loc: Lost In Space
Re: Do I have to use a resistor for each LED or... [Re: PsillyNilly]
    #3290038 - 10/28/04 05:38 PM (12 years, 11 months ago)

Depends on the voltage drop.

For example.... white Nichia's have a voltage drop around 3.5 when running at 30ma. So you could run 2 at full power or 3 at a reduced power. Most greens I have used are also 3.5

Most reds are about 1.7 so you could run more on a single resistor.


--------------------
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OfflinePsillyNilly
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Registered: 10/15/04
Posts: 831
Last seen: 11 years, 7 months
Re: Do I have to use a resistor for each LED or... [Re: luvdemshrooms]
    #3290776 - 10/28/04 08:01 PM (12 years, 11 months ago)

OK, I am running my led's in parrallel to a 6 volt power source. (NOT 9..sorry) Will I need a resistor for each LED? or can I just throw a resistor at the bottom of the (+) string coming from the battery that the leds are connected too? The (-) wire will of course be constant straight from the battery. PLZ HELP!!!


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InvisibleAlacritas
Student ofMycology

Registered: 08/28/04
Posts: 60
Re: Do I have to use a resistor for each LED or... [Re: PsillyNilly]
    #3291562 - 10/28/04 11:39 PM (12 years, 11 months ago)

If you have 1.5 volt LED's connect 4 of them in series to reach the voltage being given by your source.

If you need to connect more then that, then connect sets of 4 in series, in parallel.

I haven't done anything electronics wise in a while, so I could be wrong.. but this is how I'd wire them (assuming 1.5v LEDs and a 6v power source):

[+]|||||Battery|||||[-] 1x6.0 = 6v
|---O---O---O---O---| 4x1.5 = 6v
|---O---O---O---O---| 4x1.5 = 6v
|---O---O---O---O---| 4x1.5 = 6v
\---O---O---O---O---/ 4x1.5 = 6v


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InvisibleAlacritas
Student ofMycology

Registered: 08/28/04
Posts: 60
Re: Do I have to use a resistor for each LED or... [Re: PsillyNilly]
    #3291576 - 10/28/04 11:42 PM (12 years, 11 months ago)

You only need a resistor if the voltage being directed at your LED is too high for it to handle. If you're running em in series, then their own resistance compiles.


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OfflineSillyWilly
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Registered: 05/04/04
Posts: 196
Last seen: 12 years, 7 months
Re: Do I have to use a resistor for each LED or... [Re: Alacritas]
    #3292117 - 10/29/04 02:05 AM (12 years, 11 months ago)

thanks


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