SV: [sdiy] analogue equations

[Ian Smith]

Karl,

Hey, that AD633 looks nice. I just downloaded the datasheet for it and it has some really nice properties. Thanks for pointing that out. I think I'm going to start throwing together a schematic. I wonder what else can be done with this idea...

-Ian

----------------------------------------
> Date: Fri, 27 Jun 2008 05:04:49 +0000
> From: elektrodwarf at yahoo.se
> Subject: SV: [sdiy] analogue equations
> To: synth-diy at dropmix.xs4all.nl; taciturn_unquiet at hotmail.com
> 
> 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 :
> 
>> Från: Ian Smith 
>> 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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