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Old 29th November 2010, 06:29 PM   #71
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Why are you complaining on my pics ? You arent complaining on oversize pics posted by others.

Either way these are the last pics, this project is done.
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Old 30th November 2010, 07:36 AM   #72
dadod is offline dadod  Croatia
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How to plot distortion versa frequency in LTSpice?
dado
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Old 30th November 2010, 08:28 AM   #73
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Originally Posted by AndrewT View Post
what causes the phase "bump" between 3Hz and 500Hz? Is that audible? Does it matter?

87degree phase margin, brilliant.
Does it change much when a little bit of cable capacitance is allowed for?
It's not really a bump. The open loop gain rolls of from about 100Hz.
Then there's a low pass at around 10Hz caused by probably the feedback decoupling cap (or maybe the input coupling cap).
These are two separate things; because they are relatively close on the graph they just look like a bump.

jan didden
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Old 30th November 2010, 12:21 PM   #74
macboy is offline macboy  Canada
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Originally Posted by dadod View Post
How to plot distortion versa frequency in LTSpice?
dado
Well, you can't plot it, but you can "step" the frequency parameter (look in Help and at the examples). The simulation will run several times at different frequencies and the distortion will be measured each time, assuming you use a .four statement. You can then copy the results from the sim log and chart them in excel.
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Old 30th November 2010, 01:37 PM   #75
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And heres the end of this saga:
Click the image to open in full size.

This amp now plays in stereo and sounding awesome!! Thank you deeply for all the tips and help.
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