[sdiy] a question for the experts

[Oren Leavitt]

Hi Michael,

Welcome back!

The Analog Devices MAT-03 dual PNP pair is probably your closest bet:
http://www.analog.com/UploadedFiles/Data_Sheets/23265255MAT03_c.pdf

If 1V/Oct tracking isn't absolutely critical, or if you just want to get it up-and-running, you can use a pair of Vbe-matched 2N3906s in place of the AD821, and an ordinary 2K 1% resistor in place of the tempco.

I've built that same filter that way and it works great.

Oren

-----Original Message-----
From: Michael Schulze <mschulze at du.edu>
Sent: Apr 13, 2004 3:02 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] a question for the experts

Can someone recommend a readily available replacement for the AD821 
transistor pair in the EN#37 SVF?

Also - who's holding tempco resistors?  I need some 2k's!

Michael Schulze
Instructor of Audio Production and Electronic Music
University of Denver
Lamont School of Music
2344 E. Iliff Ave.
Denver, CO 80208
303-871-6984