i got a tool kit (my brothers) he was into moddin when he was my age but no longer, and this has a boat load of resistors and some leds i have no clue what the voltage rating on the leds are, can someone help me out?
also i have resistors in it as well most of em are lose and i cant tell the ohm value of each!!! but there are some in a bag but that also doesnt say the ohm value it has a label that reads: (104)1/4W resistors does that mean that the resitance valie is 104 or are there 104 resistors presnt? i did an equation with an identifiable led and the equation gives me that i need a 53ohm resistor, i dun have a 53 ohm, how many ohms can i go up or down inoder for this to work properly?
which side does the resistor start on? on the one that iamlookinat right now the first band is brown and the last is gold it goes- brown-black-bown(could be red...)-gold whats the value of this resistor?
well as there's no gold for position one, it would be 1(brown)0(black)2(red)x10^-1(gold) = 10.2 ohms. sounds like a really odd value tbh... why not just get a mutlimeter and test?
how to do the multimeter test, and can u do the same thing with leds? cause i have no idea how much these leds are.
use the resistance setting on the multimeter...................... no, you can't measure LEDs that way. you just have to guess what specs they are, really.
well the leds i have dun really look like normal leds some of them do but not all, i've got square ones and ones bigger than 5mm a few 3mm i think for the 5mm i should go about 3.2V right? and 20m?
1.- Pick safest values. Say, 20 mA and voltage drop of 2V. 2.- Calculate the needed resistor. 3.- Connect it and measure the voltage drop. You have then the real voltage drop. 4.- If you had a variable power supply, you could then connect the led to the power supply at the real voltage drop (without resistor). From this, you could get the real mA it consumes. But, in short, try standard values: 20mA, 2V. I think there was a post indicating the standard values for the different leds. I will search it for you. Just a second.
I think you've interpreted that wrong Firehed, though I'm far from certain. My understanding was that the last band was always tolerance, so if you've got 4 bands you'd be using the 4 band scale, which would make that a 1k resister with .5% tolerance iirc. Which would make a whole hell of a lot more sense Surely there's an electronic god here that can help?
