cpteoh26
Junior Member level 2
simple led projects
hi all.
i am making a simple LED project for my children..
i use super bright LED which consume 25-30mA
the super bright LED forward voltage is about 2.7v-3.0v.
would my circuit below work? thanks.
please confirm i am correct for my think below.
a) i use 60 Ohm, 5 Watt resistor to limit the current to 200mA
by theory calculation, square(200mA) x 60 Ohm = 2.4 Watt, i use double rating of resistor for safety propose.
b)i assume the current will be divide equally to each LED. i mean, each LED will be taking 200mA/7 (7 LED in my circuit). which is about 28.5mA. am i correct for current divide equally theory?
c)assume the 12Vdc power jack up 10% to 13.2Vdc, my current would be 220mA, each LED is taking 31.4mA, but should be still ok with the LED?
d) LED is current driven component, 12Vdc should have no problem on it. correct? it is NOT necessary to supply normal 5Vdc, correct?
e)with the LED forward voltage 2.7-3.0V, my current calculation should be (12-2.7) V / 60 Ohm?? is it i should use ((12Vdc) - (forward voltage for LED)) / (Resistor) ??
thanks.
hi all.
i am making a simple LED project for my children..
i use super bright LED which consume 25-30mA
the super bright LED forward voltage is about 2.7v-3.0v.
would my circuit below work? thanks.
please confirm i am correct for my think below.
a) i use 60 Ohm, 5 Watt resistor to limit the current to 200mA
by theory calculation, square(200mA) x 60 Ohm = 2.4 Watt, i use double rating of resistor for safety propose.
b)i assume the current will be divide equally to each LED. i mean, each LED will be taking 200mA/7 (7 LED in my circuit). which is about 28.5mA. am i correct for current divide equally theory?
c)assume the 12Vdc power jack up 10% to 13.2Vdc, my current would be 220mA, each LED is taking 31.4mA, but should be still ok with the LED?
d) LED is current driven component, 12Vdc should have no problem on it. correct? it is NOT necessary to supply normal 5Vdc, correct?
e)with the LED forward voltage 2.7-3.0V, my current calculation should be (12-2.7) V / 60 Ohm?? is it i should use ((12Vdc) - (forward voltage for LED)) / (Resistor) ??
thanks.