[sdiy] Better testing techiques for audio circuits

[Neil Johnson]

Hi,

David G Dixon wrote:
> I use Multisim, which is a SPICE-based simulator package from NI, and the
> THD tool doesn't even have a fourth decimal point -- it only goes down to
> 0.001%.

I wonder what the accuracy is at the bottom of the range?  What's the 
error margin at that kind of level?  In other words, if it says "0.013%" 
what is the +/- range?

> However, I find that it does capture a lot of the common nuisances, like
> spurious oscillations, etc, and it does predict the THD of sine shapers and
> things with remarkable accuracy.

I'd be interested in how you confirmed the accuracy.  Did you run the 
real circuit into a distortion analyser?

Cheers
Neil
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