[sdiy] Re: 4049 and 4069

[Shokwave]

----- Original Message ----- 
From: "Czech Martin" <Martin.Czech at micronas.com>

> In fact, CMOS logic gates can be used as noise
> source (linear, not time discrete shift registers).
> You can see them on my web site.
> http://www.geocities.com/SoHo/Museum/4459/circuits/cmosnoise.html

Cool!

> JFETs behave a little better, since no oxide
> isolation. The basic Id/Ug characteristic is similar,
> so why not building a distortion element with JFETs?

In fact, that's how I got here; I was looking at Jack Orman-inspired J201
distortion circuits, and playing around with them in Spice. I'm going to
play with J201's, 2N5484's, 4049's and 4069's in similar circuits to Jack's
miniboosters, and probably drive them with an opamp pre-gain stage to get
them into the interesting parts of the curve. first, for guitar, but then as
part of the more general modular synth I'm starting on (can't wait for my
sockets to arrive, so I can finish up the midi->cv converter). CV-controlled
distortion, driven by an ADSR-style envelope, could be very interesting.

-Darren