[sdiy] Novation Bass Station 2

Tom Wiltshire tom at electricdruid.net
Wed Jun 5 23:33:19 CEST 2013


Thanks Stewart!

Ok, so we use the standard flip-flop to give us a sub-oct square, and then we use the square to flip every second cycle of the main o/c's ramp output to give us a sub-oct triangle. And then we use sine shaping on the triangle.

How good is the flipping, typically? Don't you get glitches in the triangle? I suppose if you're sine shaping it and you know it's a low frequency, you just add plenty of smoothing caps after the sine shaper and call the rest character!

Tom


On 5 Jun 2013, at 22:25, Stewart Pye <stewpye at optusnet.com.au> wrote:

> You'll also have to shape the octave down saw into a triangle before going to the sine shaper. The way I had planned doing it was to invert every second saw cycle to get a tri wave of half the frequency of the original saw, as I was mainly interested in sine sub octave waveforms.
> 
> Oops, I just re-read the original post and it doesn't mention saw waves, so instead of level shifting every second cycle invert every second cycle so you get a tri wave of half the frequency. An optional inverter circuit and an analog switch could be used for this.
> 
> Regards,
> Stewart.



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