mark@mips.COM (Mark G. Johnson) (12/11/90)
In article <1990Dec10.155837.17985@engin.umich.edu> ssave@caen.engin.umich.edu (Shailendra Anant Save) writes: > > Is anyone familiar with "backsendall" (sp?) circuits? >These are low pass and high pass attenuators/amplifiers >that you can set to a particular frequency at both the >ends and use potentiometers to increase or decrease >the db level. I think you're referring to Peter J. Baxandall who developed a "shelving" topology for use in audio tone controls. You might find what you're looking for in National Semiconductor's application note number AN-64, Figures 21 thru 23. It's reprinted in their "Linear Applications Handbook." -- -- Mark Johnson MIPS Computer Systems, 930 E. Arques M/S 2-02, Sunnyvale, CA 94086 (408) 524-8308 mark@mips.com {or ...!decwrl!mips!mark}