lighting the Defiant
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lighting the Defiant
I am new to this lighting stuff and I don't inderstand all the math involved in all the sites I've looked at, but I'm just wondering if I use a 820ohm resistor will that be enough to run about 12 led's off a 9v battery. I've watched some you tube videos and know how to do the basic lay out just need some advice on this resistor and power thing.
http://ledz.com/?p=zz.led.resistor.calculator
Most LEDs other than red ones need around 3-3.5 volts. You will need to run 12 in parallel as 3 would be the maximum that you could light in series.
plug in your numbers
Leds in parallel:
Supply Voltage
VOLTS 9
Voltage Drop Across LED
VOLTS 3.4
Desired LED Current
MILLIAMPS 20
How many leds connected 12
Calculated Limiting Resistor
OHMS 23.33
Nearest higher rated 10% resistor 27
Calculated Resistor Wattage
WATTS 1.344
Safe pick is a resistor with
power rating of
WATTS 2.24
Most LEDs other than red ones need around 3-3.5 volts. You will need to run 12 in parallel as 3 would be the maximum that you could light in series.
plug in your numbers
Leds in parallel:
Supply Voltage
VOLTS 9
Voltage Drop Across LED
VOLTS 3.4
Desired LED Current
MILLIAMPS 20
How many leds connected 12
Calculated Limiting Resistor
OHMS 23.33
Nearest higher rated 10% resistor 27
Calculated Resistor Wattage
WATTS 1.344
Safe pick is a resistor with
power rating of
WATTS 2.24