**not A Joke**
Thread Starter
mcc racing
Joined: Jun 2002
Posts: 3,264
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From: Southern New Jersey
**not A Joke**
i need someone to tell me what im looking for.. i need 3 leds that can be lit by car current and will not blow out.. how hard are they to instal off of car current.. do they have hot and ground.. im looking for VERY small ones.. like the size of a pencil eraser..
thanks..
thanks..
Stage 3 Modified
Joined: Jun 2002
Posts: 5,907
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radio shack sells LEDs that are nice but are expensive,...they will only blow if you do not use a resistor or if you use the wrong resistor,...the 12s volt the car puts out will not blow the LEDs as long as you have the right resistor,...once you find the right resistor,...its just like wiring anything in the car with two wires,..power and ground
Snootchie Bootchies!!
Joined: Dec 2002
Posts: 2,013
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From: Hawaii
eurolite makes some, i got mine from circuit city VERY bright high intensity though. it includes instructions to hook it up with or without an alarm. they were about 15 bux and came with 2 leds.
Stage 3 Modified
Joined: Jun 2002
Posts: 5,907
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here OC,..if you dont understand the resistor shit,..its hard to understand
To find the value of the resistor to use with your led, use this formula:
Resistance(Ohms) = (Supply Voltage - Forward V of LED)/ Current (A)
You should be able to find these values easily, usually on the back of the package or on the website you got them from. Current for LEDs is measured in mA. you will need to move the decimal over 3 places to get to Amps.
Example - 20mA = .02A
So to run a 3.5V blue led from 5V at 20mA (0.02Amps)...
resistance = (5V - 3.5V) / 0.02A = 75ohms
If you cant find a resistor of the exact result (which you usually wont) try to find the closest one, try to go with a little more resistance, than less, to prevent damage to the resistor or LED
btw,..when you buy a LED,..it comes with 2 prongs,...the longer prong is the power and the shorter prong is the ground ,...HTH
To find the value of the resistor to use with your led, use this formula:
Resistance(Ohms) = (Supply Voltage - Forward V of LED)/ Current (A)
You should be able to find these values easily, usually on the back of the package or on the website you got them from. Current for LEDs is measured in mA. you will need to move the decimal over 3 places to get to Amps.
Example - 20mA = .02A
So to run a 3.5V blue led from 5V at 20mA (0.02Amps)...
resistance = (5V - 3.5V) / 0.02A = 75ohms
If you cant find a resistor of the exact result (which you usually wont) try to find the closest one, try to go with a little more resistance, than less, to prevent damage to the resistor or LED
btw,..when you buy a LED,..it comes with 2 prongs,...the longer prong is the power and the shorter prong is the ground ,...HTH
Thread Starter
mcc racing
Joined: Jun 2002
Posts: 3,264
Likes: 0
From: Southern New Jersey
Originally posted by NeverBX
eurolite makes some, i got mine from circuit city VERY bright high intensity though. it includes instructions to hook it up with or without an alarm. they were about 15 bux and came with 2 leds.
eurolite makes some, i got mine from circuit city VERY bright high intensity though. it includes instructions to hook it up with or without an alarm. they were about 15 bux and came with 2 leds.
Thread Starter
mcc racing
Joined: Jun 2002
Posts: 3,264
Likes: 0
From: Southern New Jersey
Originally posted by WideBodyEK
here OC,..if you dont understand the resistor shit,..its hard to understand
To find the value of the resistor to use with your led, use this formula:
Resistance(Ohms) = (Supply Voltage - Forward V of LED)/ Current (A)
You should be able to find these values easily, usually on the back of the package or on the website you got them from. Current for LEDs is measured in mA. you will need to move the decimal over 3 places to get to Amps.
Example - 20mA = .02A
So to run a 3.5V blue led from 5V at 20mA (0.02Amps)...
resistance = (5V - 3.5V) / 0.02A = 75ohms
If you cant find a resistor of the exact result (which you usually wont) try to find the closest one, try to go with a little more resistance, than less, to prevent damage to the resistor or LED
btw,..when you buy a LED,..it comes with 2 prongs,...the longer prong is the power and the shorter prong is the ground ,...HTH
here OC,..if you dont understand the resistor shit,..its hard to understand
To find the value of the resistor to use with your led, use this formula:
Resistance(Ohms) = (Supply Voltage - Forward V of LED)/ Current (A)
You should be able to find these values easily, usually on the back of the package or on the website you got them from. Current for LEDs is measured in mA. you will need to move the decimal over 3 places to get to Amps.
Example - 20mA = .02A
So to run a 3.5V blue led from 5V at 20mA (0.02Amps)...
resistance = (5V - 3.5V) / 0.02A = 75ohms
If you cant find a resistor of the exact result (which you usually wont) try to find the closest one, try to go with a little more resistance, than less, to prevent damage to the resistor or LED
btw,..when you buy a LED,..it comes with 2 prongs,...the longer prong is the power and the shorter prong is the ground ,...HTH
h: