[sdiy] 566

[john mahoney]

----- Original Message ----- 
From: "René Schmitz" <uzs159 at uni-bonn.de>
>
> I don't know really why all craze about this chip. ...

I've been skimming through T.H.'s 566 book again, and the following quote
suggests that Rene has a good point:
    "Like I say, if ultra precision is your goal, then there are more
    effective ways of designing an exponential VCO for synth work."
This comment (in the next to last paragraph on page 10) was in light of some
tracking problems. Basically, the 566 exponential VCO was flat above 9kHz.

I still say, if you've got the parts, you should at least build a prototype.
(Otherwise, the parts are *guaranteed* to be useless. ;-)

One interesting feature of the 566 is that you can get quadrature square
waves from it -- 4 squares that are 90 degrees out of phase from each other.
This is really cool for certain modulation uses, although I'd much rather
have quadrature triangles, ramps and saws.
--
john