mad diode chips

[WeAreAs1 at aol.com]

In a message dated 7/23/00 9:51:14 PM Pacific Daylight Time, 
diode at hotmail.com writes:

<< For those of you interested, click on this for an auction for 125x MAD1109 
 diode array chips on ebay.. dont know if you can use these instead of the 
 1108 that everyone made a fuss abt last month but $1bid.. maybe useful to 
 someone out there.. >>

Those may indeed be useful to some.  The MAD1108 is eight isolated diodes on 
one substrate in a 16-pin package.  The MAD1109 is seven isolated diodes on 
one substrate in a 14-pin package.  Tom G. uses a pair of the MAD1108's on 
his diode-ladder filter boards.  I don't know if all 16 of the diodes are 
used by this design (I haven't seen the schematic).  How many diodes are 
needed in a 4-pole diode ladder filter?  If it's 14 or less, then the 
MAD1109's would be useful.  However, if you want to just plug the parts into 
Tom G's already-designed PCB's, you'll need the MAD1108's.

Michael Bacich