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Subject: RE: [emlsynth] Re: EML500 filter resonance

From: "George Mattson" <axisair@...>
Date: 2011-11-02

Not a clue. I don't have a 500. But, the 400 filter uses that board.
Look for a 15K resistor connected to the top of the Q slider.
 
That 15K resistor connects to the input of a 748 quad op amp, two 100K resistors and a 3.3pF cap.
 
The 100K resistor in parallel with the 3.3pF cap is the feedback limiting resistor from the LP output back to the network input.
 
Reduce the 100K.

From: emlsynth@yahoogroups.com [mailto:emlsynth@yahoogroups.com] On Behalf Of bill bigrig
Sent: Wednesday, November 02, 2011 10:10 AM
To: emlsynth@yahoogroups.com
Subject: RE: [emlsynth] Re: EML500 filter resonance

 

Ressistance in the feed back path eh? Any hints what components that resistor would be between?
rig