[sdiy] saw/ramp from square?

[harrybissell at wowway.com]

I used the differentiated square / rectifier for the sawtooth wave on the
"Muffy" guitar processor (see Larry Handry's site). It does work well over
a limited frequency range... and within limits the amplitude does not vary

H^) harry

I will check the music easel...



On Fri, 16 Jan 2009 23:13:39 -0500, Aaron Lanterman wrote
> On Dec 31, 2008, at 4:26 PM, Scott Nordlund wrote:
> 
> > A simpler way to get a "sort of" saw would be to highpass filter the  
> > square wave and then half-wave rectify the output.  It will have a  
> > strange formant (and will similarly impart this formant when used  
> > for PWM), but it's still good for some purposes. You could also  
> > alter the wave shape by adjusting the highpass filter or DC offset  
> > on the rectifier.
> 
> The Music Easel has a curious waveshaping circuit that does 
> something  like this to generate the "pulse" from the "square" (see 
> lower left  corner of Board 8 of the 208 Magnus's Buchla Page).
> 
> - Aaron
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Harry Bissell & Nora Abdullah 4eva