Low distortion sine generator, was:digital Filter in CD Player ?

[Ingo Debus]

Martin Czech wrote:
> 
> The idea with the CD player as such is very good. If you take a cheap
> portable chassis (like me) you have a very pure sine wave (and other)
> source that would not be affordable otherwise. Everything below 0.1%
> THD is not so cheap.

(just because that old Elektor issue with the article on CEM chips is
still laying around...)
There's a Wien bridge sine generator in Elektor 10/81 (including PCB
layout). Amplitude is stabilized with a NTC. They claim distortion is
below 0.01% and the frequency range is 10Hz...100kHz.

Ingo