dear sirs
i want to connect 20 leds in parallel.
my source is 2x 4.2v batteries parallel
led voltage white 3.4v 20ma
in the following page i can find that i need 20 resistors 47ohms
http://led.linear1.org/led.wiz
now in other page
http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator
i find out that i need resistor 2ohms 03w
does it mean that i need 1 resistor for all circuit? or 20 resistors, one to each led as the previous page?
what i want to do, is to connect in the beginning of the positive wire only one resistor to limit the voltage to all leds. instead 20 resistors , one to each led
is it possible? i am little confused!
thanks
i want to connect 20 leds in parallel.
my source is 2x 4.2v batteries parallel
led voltage white 3.4v 20ma
in the following page i can find that i need 20 resistors 47ohms
http://led.linear1.org/led.wiz
now in other page
http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator
i find out that i need resistor 2ohms 03w
does it mean that i need 1 resistor for all circuit? or 20 resistors, one to each led as the previous page?
what i want to do, is to connect in the beginning of the positive wire only one resistor to limit the voltage to all leds. instead 20 resistors , one to each led
is it possible? i am little confused!
thanks
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