[sdiy] Low Frequency Square to Sine Waveshaper

[Paul Perry]

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