I noticed an omission on Olivier’s BOM for TL074s : we need two instead of one. I have a mouser cart available for anyone interested.
It says two.
Were you looking at something else?
I checked on the BOM like 4 days ago when soldering, and I swear I read 1.
EDIT : I read it on the Shruthi+SMR BOM here https://docs.google.com/spreadsheet/pub?key=0Ai4xPbRS5YZjdFV1YmdGZXdFYmMzV1NfTEZpRWZVd1E&output=html
I feared this was mk1, but then I got my relif when I read “Shruthi SMR4 mkII filter v0.8 PCB” at the bottom of the table. I was sure I was right buying an extra TL074 because there are two mentionned (IC4/IC7) and in the end, there was one empty DIP16 socket that was feeling alone.
Now I compared both BOMS and noticed just one more difference : R9 on one side, and R4/5/6/7 (but only 1 x 20K trimmer) on the other.
Fixed the XT BOM!