I've just got the chance to sine sweep my preamp I've been designing and building, over all im relatively happy with the results. There are a few issues. There seems to be a fair bit of ripple (from the power supply?) and the bass EQ has an interesting phase response.
The bass eq isnt +/- 12dB at 100Hz as it was designed, it instead does about +/- 5dB @ 100Hz. What is interesting is that when boosted, a approx 10dB drop appears at around 200Hz and when cut, a 10dB boost at 200Hz.
Does this make sense? I've attached a plot of what I described.
Any thoughts on this?
The bass eq isnt +/- 12dB at 100Hz as it was designed, it instead does about +/- 5dB @ 100Hz. What is interesting is that when boosted, a approx 10dB drop appears at around 200Hz and when cut, a 10dB boost at 200Hz.
Does this make sense? I've attached a plot of what I described.
Any thoughts on this?
My apologies, I've attached a copy of the schematic now. The simulation kicks up the same fuss as the sine sweep, must be a problem with the design.
There are 8 filters on the schematic (2 versions of the same 4 band). The bass response in question is the one 3rd down on the left.
It's part of a uni project, deadline is Friday so just looking to get rid of these last few niggles.
As far as I am aware, we don't have the ability to use a commercial product for testing Frequency Response. I was shown this one device, not sure what it was but the academics suggested just using spectrafoo instead.
Can anyone offer advice?
There are 8 filters on the schematic (2 versions of the same 4 band). The bass response in question is the one 3rd down on the left.
It's part of a uni project, deadline is Friday so just looking to get rid of these last few niggles.
As far as I am aware, we don't have the ability to use a commercial product for testing Frequency Response. I was shown this one device, not sure what it was but the academics suggested just using spectrafoo instead.
Can anyone offer advice?
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