[sdiy] saw/ramp from square?

[David Moylan]

This method is also the one used in Arp Omni to generate saw type waves 
for the string sounds (different RC values per note).  You can also 
choose to rectify the signal or not, so you can get the saw type or the 
positive and negative pulse which gives it a more hollow sound.

Dave

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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