knock led
#22616
February 21, 2002 03:35 pm UTC
February 21, 2002 03:35 pm UTC
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Joined: Nov 2001
Posts: 106
tn
sean peterson
OP
Member
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OP
Member
Joined: Nov 2001
Posts: 106
tn
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the part numbers given in the vfaq don't show up at radio shack. what volt, size led do i need.
93 Talon Tsi AWD
Thermal R&D 3" cat back
K&N
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Re: knock led
#22617
February 21, 2002 04:00 pm UTC
February 21, 2002 04:00 pm UTC
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Joined: Jan 2002
Posts: 198
Toronto
Bali Minhas
Regular Member
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Regular Member
Joined: Jan 2002
Posts: 198
Toronto
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Did this mod last week. Just get a 5.0v 470mcd led. You can get it from any electronics supply shop, in toronto there is electrosonic or Sayal. You should have something in your area.
They cost $2.53 for 5 leds in a pk. You can also get led holders for like $0.15 each.
You must use a resistor it is 470R.
Cheers,
1993 Laser RST AWD
1994 Eagle Talon TSI - 12.0@117.72 (bone stock 172k motor) - RIP
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Re: knock led
#22618
February 21, 2002 05:27 pm UTC
February 21, 2002 05:27 pm UTC
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Joined: Jul 2000
Posts: 200
Toronto, ON, Canada
Steve Alexander
Member
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Member
Joined: Jul 2000
Posts: 200
Toronto, ON, Canada
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If you can't find the exact parts mentioned, just use the formula:
I = V / R , or curent = voltage / resistance
Your car is a 12 V to ground system so:
I = 12 / R
for example, if you find a 12 amp LED, you need a 1 ohm resistor:
12 = 12 / R
R = 12 / 12
R = 1
Steve Alexander / 90 Laser RS Turbo / 91 Talon TSi AWD
For knowledge: Club DSM (read everything)
DSMentia is down: I moved, and haven't set up my webspace yet.
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Re: knock led
#22619
February 22, 2002 01:43 pm UTC
February 22, 2002 01:43 pm UTC
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Joined: Sep 1998
Posts: 7,944
Halifax, NS
Troy Jollimore
Senior Member, with Far TOO Much Time on Their Hands
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Senior Member, with Far TOO Much Time on Their Hands
Joined: Sep 1998
Posts: 7,944
Halifax, NS
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12v 12amp micro LED? Whoa... I'll have to recheck mine, but I slapped quite a few 470mA resistors inline with it, and saw no difference in the light output. (:
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Re: knock led
#22620
February 22, 2002 03:08 pm UTC
February 22, 2002 03:08 pm UTC
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Joined: Jul 2000
Posts: 200
Toronto, ON, Canada
Steve Alexander
Member
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Member
Joined: Jul 2000
Posts: 200
Toronto, ON, Canada
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I knew that I should have put a disclaimer that the numbers used were simply to make the math more understandable.  It doesn't have to be exact, after all, the voltage seen isn't always exactly 12V. I just know that when you walk into an electronics store and see a choice of 500 different resistors, and 200 LEDs, it's nice to have some target to shoot for. 
Steve Alexander / 90 Laser RS Turbo / 91 Talon TSi AWD
For knowledge: Club DSM (read everything)
DSMentia is down: I moved, and haven't set up my webspace yet.
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Re: knock led
#22621
February 23, 2002 06:43 am UTC
February 23, 2002 06:43 am UTC
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Joined: Dec 2000
Posts: 1,986
North of T.O.
Len Randall
Serious Member
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Serious Member
Joined: Dec 2000
Posts: 1,986
North of T.O.
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Why not just use a 12volt led and forget the resistor?
They sell them at Active components (right beside Electrosonic).
'92 Talon TSi AWD.
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Re: knock led
#22623
February 23, 2002 02:40 pm UTC
February 23, 2002 02:40 pm UTC
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Joined: Jan 2000
Posts: 428
Pickering, On
Ken Barkhouse
Member
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Member
Joined: Jan 2000
Posts: 428
Pickering, On
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Let's see.... Standard LED's - Anything other than blue, white or purple have apx. 1.8v drop across the die. Most 3mm leds have a 10ma. current draw and most 5mm draw 20ma.
Remember:
V
_____
I | R
R= V/I
3mm R= (12v-1.8v)/.010A
R= 10.2/.010
R= 1020 Ohms Or 1K Ohms
5mm R= V/I
R= (12v-1.8v)/.020A
R= 10.2/.020
R= 510 Ohms
510 Ohms is a standard value or you could use 470 Ohms
If anyone wants an LED and resistor just email me and I will give you one, I have tons of them here at home.
[ February 23, 2002: Message edited by: Ken Barkhouse ]
97 Eclipse GSX - Off to a new home
01 Stratus R/T coupe - Dodge on the outside, Mitsubishi on the inside.
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