ok i think this will work so i need 3 1.2volt aa batteries and a 2ohm resistor put in just after the switch in series, with all the LED's in parrallel?
thanks, i have looked into led strips but they work out far more expensive than if i wire it myself.
Not sure what you mean by 'I wouldn't want to waste energy in a current limiting resistor, although you could put a small limiting resistor just in case of a short if you wanted.' what sort of...
ok it is for an instaltion i am doing involving a semi transparent tunnel 1.5m long which people will crawl through. i want to light the tunnel along the bottom edges either side (hence 2 strips of 10 led's) it dosent need to be extremely bright as it is meant to be somewhat scary. i thnk it...
I need to make a 'strip' with 10 leds about 15cm apart in a line. So if i use 3 x 1.2V rechargeable (NiCad/NiMh) batteries and wire all the LED's in parallel i shouldn't need resistors? I am not sure what you mean about 'arrange the LEDs in groups so that they are as close to the supply...
So the Voltage Across the resistor would be 5.5V, and the current through the resistor should be the same as the LED - 30mA. ohms law then says the resistance should be 5.5/0.030 = 183.3 ohms. so with 10x LEDs and a 9V battery i would have 10x 180ohm resistors, one between each LED all in...
Basically I am trying to make a circuit with 10 white LED's and any number of 9v or similar batteries. Iv heard i need 1 resistor per led but not sure whether to use 330ohm or 470ohm resistors (or different). The LED's are 3.2 - 3.8V and 30mA.
i have 20 ultrabright white LED's and i want to get a good brightness out of them. they will be in 2 circuits of 10 leds each. i think i need 1 resistor per led but I am not sure which resistors to use. The LED's are 3.2 - 3.8V and 30mA. i plan to use 9v batteries in whatever combination is best...