[sdiy] Low Frequency Square to Sine Waveshaper

[Kyle Stephens]

The PLL way sounds promising ('phase locking' being
the main thing I'm looking for anyway).

Still, I might give this a go too:

http://www.freepatentsonline.com/3139537.pdf

Thanks :)

--- Paul Perry <pfperry at melbpc.org.au> wrote:

> The problem with filtering a square wave to produce
> a sine, is that you get
> a different amplitude depending on the frequency you
> are working at.
> And it doesn't work very well anyway.
> 
> A constant amplitude triangle can be turned into a
> reasonable sine, either
> by a diode wave shaping circuit or by carefully
> overdriving an operational
> transconductance amplifier by just the right amount.
> 
> I can't think of a simple way around all this, if I
> wanted a number of LFO
> sines that have frequencies 1/N of a master clock,
> I'd be thinking about a
> number of VCOs each locked via a PPL to the master,
> dividing at different
> rates.
> 
> Paul Perry Melbourne australia
> 
> 
> 
> 
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