SV: [sdiy] analogue equations

[Karl Ekdahl]

Hi Ian

I've been thinking of something similar but way simpler just using a AD633 four quadrant multiplier, this little chip can do multiplication, squaring, square rooting, division etc. I'm guessing any four quadrant multiplier could be used to do the same operations.

Karl


--- Den fre 2008-06-27 skrev Ian Smith <taciturn_unquiet at hotmail.com>:

> Från: Ian Smith <taciturn_unquiet at hotmail.com>
> Ämne: [sdiy] analogue equations
> Till: synth-diy at dropmix.xs4all.nl
> Datum: fredag 27 juni 2008 06.22
> hello all,
> 
> Time for another weird Ian question/idea... I've been
> playing around with Analog Box (software modular synth
> thing, quite brilliantly done) and something you can do
> with it is have various mathematical equations that you can
> send waves through, e.g. x*(y+sinx) where x and y are the
> inputs to the block. I was wondering if it's possible
> to do this sort of thing in the analog patch cord world...
> do things like Sin and Cos and square roots. I know you can
> add two inputs because that's what a mixer does.
> 
> And now for the odd idea... I'm envisioning a module
> with two inputs (say x and y) and four 12 position rotary
> switches that would send the inputs through various math
> functions and between each rotary have a DPDT switch that
> would switch between adding or multiplying the output of
> the previous rotary to the next one. I was thinking for the
> math functions: x+y, x-y, x*y, x/y, Sin x, Sin y, Cos x, Cos
> y, x*x, y*y, square root of x, square root of y. again, if
> all of these are possible.
> 
> If people want, or if my description isn't clear, I can
> draw up a flow chart type schematic of this.
> 
> -Ian Smith
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