[sdiy] Filter problem

[Ian Fritz]

Neil --

I haven't seen your design. Does it incorporate compensation for 
high-frequency Q enhancement?

   Ian



At 04:28 AM 7/8/2002, Neil Johnson wrote:

>Now, the problem.  Occassionally, and related to noise spikes on the mains
>(evidence: turning on my sig-gen triggers the fault, even if not connected
>to anything), it goes mad and oscillates at full amplitude -- it normally
>sits at a couple of volts pk-pk, but goes +/- 15V fullswing.  My guess is
>that one of the op-amps is being overloaded, perhaps an input exceeding
>limits, and so going into phase reversal, with the resulting honking.