RussMaxManiac

I might have figured it out with the help of one other max owner here. I also had to use some ohms law as well to figure out what resistor I need exactly for my leds. So I will let everyone know how it comes out. I will try to work on the car tomarrow evening if I get some time.

This is on adding more additional led's to the stock alarm...

Blue colored.

RussMaxManiac

Also, if you guys want a easier way to hook it up. I found these on the the net. http://www.directron.com/led.html They are in houston, and these have 3 wires. 12v, ground, and alarm signal. Basically you hook it up to all the wires on your clock that you need and this will power up fine!

Regular bright leds like I have require a resistor as well and a sorta different way to hook up to make them work. I will let you guys know.

theMax

not sure if this will help...

Radio shack has 12V LEDs, that might eliminate your need for a resister. I used them to replace my 194s in the doors. $1 each.

JKiMaxAC

yea if u get a 12v led no nees for resistors.. i did the same as theMax did and i didn't need it.. but for my doam light i need them so i can have more led's work off of one line.. so i have 6 ultra white led's in my doam light.. and its bright as hell...

BigDogJonx

iTrader: (7)

Hey hope the help works out. Cause I am fairly sure with the info me and you came up with, that it HAS to work.

I am gonna get the 12V ones and do it that way. But hope yours works out.

RussMaxManiac

My current LED's are 5v leds from radioshack that was recommened. They do not carry 12v LEDs at radioshack. They are hard to find in blue.

theMax

Calling me a liar....I ordered the 12V leds online at www.radioshack.com because the store was out of stock.
Part number is below from their webpage (276-0209). I emailed their customer support with what I wanted and they returned a list of part numbers for the correct colors. Hope this helps.


--------------------------------------------------------------
12 V LED (276-0209) Specifications Faxback Doc. # 16504

Reverse Voltage:.......................................... ..............5 V
Reverse current (Vr=5V):.......................................... ....10 uA
Operating Temperature Range:..................................-40 C to 85 C
Storage Temperature Range:...................................-40 C to 100 C
Led Soldering Temperature:..............................260 C for 5 seconds
[1.6mm (1/16 inch) From Body]


(ALL-08/16/95)

RussMaxManiac

Sorry but that is not the LED. I SAID BLUE..... in BLUE they do not carry them. I went to radio shack and looked online. In 12v they do not.

multiplexor

uhm so what colors did you get for the resistor?
what the ohm?
i'm trying to basically do the same


Thanks

Y2KevSE

iTrader: (13)

I think he got lazy and bought the LEDs that I have (3 wires, power, ground, and security).

RussMaxManiac

220~ ohms for 5v leds. But it depends on what amps the leds are, and now I forgot what mine were. I think .20 amp, not positive. Whatever it was it came out to near 220ohms with this formula..

Ohm = (Mains Voltage - LED Voltage) / LED Amperes, so;
Ohm = (12 Volts - 1.5 Volts) / 0.015 A



I bought the 3 wire leds as well but not used them yet.

areX

iTrader: (1)

what i'd really like to do is use LEDs in my dash... that would be insane... but.. but... i'm scared...

multiplexor

oh... hehe

i figured i will need a 450 ohm resistor

just have to test that now...

multiplexor

"6000 mcd 5mm Ultra Bright BLUE LED
Operates on 2.5 - 3 VDC @ 20mA.
6000 mcd typical luminosity T1-3/4 (5mm) Blue. 466nm, 29.5° viewing angle"

so from that i get:
(12-3)/0.020=450


i've been a LED freak since i was like 12... taking them out of used vcr's and ****... i'm probably gonna plug them everwhere in my max hehe


hmm quick question, if i hook up one led to the next...
ie:

(-)----|--|-----|--|-----(+)
| | | |
\ -/ \ -/
\/ \/

assuming both leds are 3 volts, I would need 6 volts to power them
fully right? or would 3 volts cover both with enough power?

if i need 6 volts to light up both leds, then i simply need 4 leds
to accept the 12 volts?

just giggle if i'm wrong, and then proceed to correct me

hehe

thanks

woosh

you would need 3volts across each LED hence a total 6 volts.
there would be 6volts remaining, so true you could use total of 4 LEDs

multiplexor

haha wow my diagram didn't turn up as i wanted it to

yikes...

hmm cool good to know 4 leds would work.

so theoretically... if i use 4 leds and hook them up
to the dome light (which is 12 volts right?)
then it should work properly, without a resistor?

RussMaxManiac

Each led will need its own resistor and its own separate connection. You can't do them all behind one resistor, it will make too much of a load.

Dustyroads

That would be true if he were hooking the led's up in parallel, but he isn't. He is going to hook them up in series. If he does that then he can get away with using 4 LED's and no resistor.

Essentially what he is doing, is the same thing you are doing with your pull down resistor. You have a potential that is too high and you need to match that with the level of your LED, so you put a resistor in series with the LED's to chew up some of the voltage and then you have enough for your LED but you won't blow it up. Plain and simple. No need to hook each LED up to it's own pull down resistor.

woosh

True, it would look like

+ 12v -|>-|>-|>-|> - gnd ( 20 ma flows ->)
3v 3v 3v 3v

multiplexor

yeah exactly like that

this way no resistor would be needed since the leds would be eating up the voltage properly.
sweet stuff...

maybe i'll hookup 2 bright whites and 2 blues?
seems like a fun little thing to mess around with