[sdiy] current question

[harrybissell at wowway.com]

The waveshapers will have some glitch that can affect
PWM and triangle shapers...

H^) harry



On Thu, 26 Jul 2007 21:58:34 +0100, Tom Wiltshire wrote
> On 26 Jul 2007, at 21:06, John Mahoney wrote:
> 
> > The goal is to produce a suboctave output that's not a square wave.
> 
> You can do this by mixing the output of a standard squarewave subosc 
>  with the ramp output from the main oscillator. When the peak-to-
> peak  levels of the two signals are the same, the mixed result is a 
> sub- octave ramp wave. I bet you've got all kinds of waveshaper 
> circuits  that'll let you do interesting things starting with a ramp 
> wave!
> 
> hope this helps,
> Tom
> 
> An aside:
> Interestingly, you can see why this trick works if you think about  
> the frequency spectrums of the two waves. The Sub-oct square (call 
> it  frequency f) includes f, 3f, 5f, 7f, 9f, etc. The ramp is twice 
> the  frequency, 2f, but includes all the harmonic multiples of 2f, 
> eg 2f,  4f, 6f, 8f, 10f. So you can see that it fills in the blanks!


Harry Bissell & Nora Abdullah 4eva