> >How can I Calculate the maximum current for a specific track ?
> >Or how to calculate track width based on desired max current...
>=20
> There are tables for doing this, and it has been covered on the list =
in the
> past. The problem is usually not the size of the track, but what =
voltage drop or

Thanks Alan, but the search engines for the archives are not that =
good...
I either found nothing, or about 100.000 posts of no relevance...
All i need is a simple formula to make sure my tracks won't get hotter =
than +5 deg C. of ambient temp.

I have designed two boards for use in LED signs.  1 for master.  The =
other is a slave board.
The slaves can be stacked after a master, to produce the desired display =
length.=20
But here the current problem arises:
The main board gives a load of 220 mA at full light output on 64 LEDs.  =
at about 10 mcd 120 deg angle. (Nice ?)
The slaveboards pull another 200 mA max, pr. board.

U need 10 boards to get a 1 meter wide sign.
I just need to find out where my limit goes, and if I need to fix the =
track width of the power  and ground planes.

I am using 37 u Copper lanimate.  (Will step UP if needed...)

Altso: What is the thightest anyone have done pcb tracks at home ?
My design uses 200 mic data bus, and it is not fun to make...  (Doing it =
with laser + foil + photoresist)

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