[sdiy] Sine shaper from AD633

[Paul Perry]

Curiously enough - though it has nothing whatever to do with
Juergen's device - there is a way of approximating a sine
converter using an analog multiplier such as an AD633.
Unfortunately my electronics books are in storage at the
moment - but maybe someone can remember back from the
late 60s.
Like many things back then, it was based on some trigonomical
approximation, generating the sine as a function of X, Xsquared,
Xcubed but with an ingenious arrangement of feedback to
minimise the number of expensive multipliers required.
Personally, whenever I want a triangle to sine converter I overdrive an OTA,
this seems cheapest to me, and also close enough for rock and roll.

paul perry Melbourne Australia

----- Original Message ----- 
From: "Gergo Palatinszky" Subject: [sdiy] Sine shaper from AD633
> Hi,
> Anybody did a sine wave shaper out from AD633?
> I'm thinking about it for Jurgen's living VCO sine output...
> Pros/cons?
> Thanx
> Br,
> Pala