mce2s resitor question

knifebright · Feb 6, 2005

Hey all
i've got a 30ohm tail cap consisting of a single 30ohm restitor. I'd like a little more restistance. I understand how to run resitors in pararel to make the restistance go down. I.E. add another 30 and i'll get 15ohms. How do i get it to got up. I'm assuming that to get it to 60 ohms i'll need two 120 ohm resitors. Is there anyway to add more smaller amounts i.e.(i have 15ohm and 30ohm available) to add up the resitance??
jimmy

HarryN · Feb 6, 2005

Two ways to go up in resistance
- put them in series
- replace the existing resistor with one of higher value

Chop · Feb 7, 2005

With the McE2S, you'll need to remove the resistor and replace it. I would recommend using at least two resistors in parallel. When I need 60 ohms, I do use two 120 ohm resistors.

tinkerfy · Feb 7, 2005

so does that mean if I were to add another 60 ohm resistor parallel with the existing 30 ohm, that would make the final outcome to be (30 + 60)/2 = 45 ohm?

knifebright · Feb 7, 2005

Hey tony
Were do i get the resistors that are the size (physical size) of the ones for the mce2s. It seems that the ones from the shop (603) are a much smaller size. I'm assuming physical size has nothing to do with wattage rateing??? I just need a couple 120ohm but in what size??
jimmy

HarryN · Feb 7, 2005

I am pretty sure that the formula for resistance adding is

1/R1 + 1/R2 = 1 / R total, so

1/30 + 1/60 = 3/60 = 1/ R total, so R total = 20 ohms

Chop · Feb 7, 2005

The resistors used on the switches are 1210 size. You can get them at just about any electronics supply store or on ebay.

Finbar · Feb 7, 2005

In this forum, at the top of the page, the sticky post by Jtice has a LED resistor calculator. Very nice. Needs one for the Mac though.

Luxeon.com has a LED resistor calculator also.

Fin

Krit · Feb 7, 2005

If 2 resistors is not the same value. It will get very hot from current.

mce2s resitor question

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