[sdiy] kraakdoos.

[Dave Krooshof]

I found the schematic on the web!
the page is in dutch, but it's main statement is:
Use the 709. It can't be replaced by anything better.
The circles are 'body contacts'
http://www.ping.be/logos/kursus/2005.html

It was invented by Michel Waisvisch, who describes it as a way
to become a thinking part of the electronic circuit.
http://www.xs4all.nl/~mwais

I already built a kraakdoos one a year ago.
It's the easyest DIY synth, and it has a wide range of sounds.

One interesting thing: I tried varous opamps.
The 741 is the one I started with, as I coulnd find a 709.
I tried opamps that were said to be better, but those hadn't
got enough noise to help the oscilatons kick in.
But the main disadvantage is that those modern opamps
have seem to have a feature called "frequency stabilistation".
Indeed, on the 741 it's posible to whistle stable melodies
(though out of key).
The 709 is a lot wilder, it makes the kraakdoos go over the whole
spectrum, from 'DC' to above 20k.

So I wondered, what is this frequency stabilisation in fact?
Maybe someone from the 709 days can tell me what f.s.
was invented for.

groets,

Dave