[sdiy] why 10V

[jhaible at debitel.net]

>    > Next question: If you run a +/-5V audio signal thru a chain of N
>    > unity-gain all pass filters, what will be your worst case maximum
>    > level at the end of the chain ?
> 
> A Hilbert transform is probably the worst case scenario.
> 
> The Hilbert tranform is a 90-degree phase shift that's constant over
> frequency.  If you apply a square wave to a Hilbert tranform, the
> result is a waveform with huge spikes.
> 
> So if the all pass filter aproximates a constant 90 degree phase
> shift, the output peaks could be maybe ten times the input square wave
> voltage.

Thanks for adressing this, Don!
10 times is more than I expected. How did you calculate this?

JH.

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