20 Jan
2005
20 Jan
'05
5:26 p.m.
Thanks Tony! The toroids are L1 and L2, and knowing they are 30 uH helps
out a LOT! Since they are colored yellow, I am guessing they are iron
powder. The application I have in mind is harmonic surpression on 80 M
transmitters; hate to see good parts go to waste :).
The Apple Disk
II analog board has a couple of toroid cores on the
board; does anyone know what the permeability is, or better, what would
be the equivilent Amidon number would be?
The official schematic shows 5 inductors :
L1, L2 30uH
L3, L4 470uH
L5 68uH
I guess you could count the turns of the existing windings, remmeber that
L is proptional to n^2, and thus get the specific inductance (probably
more use than the permiability) that way.
-tony 
21 Jan
21 Jan
4:38 a.m.
Thanks Tony! The toroids are L1 and L2, and knowing they are 30 uH helps
out a LOT! Since they are colored yellow, I am guessing they are iron
Just to confirm (just in case the schematic doesn't match the board):
One side of L1 goes to the +12V input (pins 13,15,17,19 of the interface
connector), the other t opin 18 of the 3470 chip (It's the 12V filter, of
course).
One side of L2 goes to the +5V input (pins 11,12 of the interface
connector), the other to the 5V pins on, say, the 74LS125.
Also, please remember I'm taking this from the manual, I've not put these
coils on a bridge myself. It's always possible there were changes.
-tony
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