[sdiy] RE: Re: [sdiy] Overdriving 4069UB

[Tim Daugard]

>from Paul Perry

> On the more general question of distortion stages in
> series, is there any opinion on how many stages there
> should be, and how much distortion there should be
> per stage? Is it not worth having more than 3 stages,
> for example?

For anything other than a true hard distortion, i.e. so much gain that
you can never get anything but a square wave, one stage should be
enough. We're discussing 4049 distortion where some of the stages were
used as gain stages to get the signal large enough to distort. It was
an interesting idea for the time.

The stompbox cookbook has a a design with 4 stages of 324 gain. It's
designed to take advantage of the crossover distortion of the 324.

I have on my list of things to try, a dual distortion module using to
sets of 3 stages of 4049. I also want to build a four stage opamp
distortion with a socket so I can test varios ICs.

If I'm going to use more than one stage of distrtion, I put someting
between the stages - filters, mixers with some of the orginal signal
added, subtracted, filtered. If you start with a hot signal one stage
is enough.

> And what do the mathematicians think?

I don't know, I'm a technican, when I took all my math classes, the
teachers thought entirely different. I took linear algebra and the
later statistics. The statistics (math) teacher said I had to use a 50
step algorithim to solve a statistics proble instead of a 4 or 5 step
matrix transform.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm