At 08:34 AM 5/20/2003 +0100, you wrote:

>Would it be possible to cut the track under the PCB and add a surface mount
>resistor of a few ohms for each LED just to help with current sharing?

Might be totally unnecessary. Look at the slope of the of delta-Vf /
delta If for a single diode and calculate the equivalent series resistance.

Eg. a certain GaAsP/GaP yellow LED Vf changes from 2.2 to 2.6V for
Vf changing from 12 to 40 mA (it's pretty linear above 5mA).

Rs = 0.4/0.028A = 14.3 ohms.

Putting a few ohms in there isn't going to make much difference and is a
lot of work.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body