Io Distorter

[stringsthings]

... For now here are some sound clips of what I have so far!

http://soundcloud.com/rick-deckard-sfpd/io-distorter

that's an interesting circuit ... very fuzzy ...

[WhenBoredomPeaks]

Here is a verified layout:

It is made for dual opamps.  (4558, TL072 etc.) I grounded the unused pins.

It will not work with the 741 specified by the OP!
(i had much more leftover dual opamps than singles so i used a dual)
I switched the resistors like electricteeth wrote.
I actually used a 68k/680k pair instead of 47k/470k so i think it won't make a difference because of the 1:10 relationship stayed the same.
I tested it with a RC4558 opamp.

Obviously the shown perfboard piece is much bigger than what you will actually need.
You can fit the thing on a 12 rows wide, 10 rows tall piece of perfboard or if you don't wanna ground the unused pins then you can use a smaller piece of perf.
Here is a link for a pic of what you will actually need: http://img836.imageshack.us/img836/2337/iodistorterpic2.jpg

[electricteeth]

Awesome looking layout! Yay! Thanks!

[DavenPaget]

Awesome looking layout! Yay! Thanks!

How about trying out folkurban's PWM (fuzz) linked directly into a rambler (again , FuB ) and then into a RAT (being on the same board ) 
Mad combination   ( Well , i might TRY it . )

[electricteeth]

I def want to build a PWM! First I have to build another ugly face with LFO mod! Just ordered the parts for that beast today!

[DavenPaget]

I def want to build a PWM! First I have to build another ugly face with LFO mod! Just ordered the parts for that beast today!

Or a uglyface into a two stage CMOS 555 then into a mad pair of clippers . RAWK !
( i know , my combinations are AWESOME and crazy and probably doesn't work , i am the Lord Overkill )

[electricteeth]

A two stage cmos 555 circuit? Do tell!

[DavenPaget]

A two stage cmos 555 circuit? Do tell!

Just cascade a cmos 556 from 1 output to another input . 
You go girl !

[electricteeth]

Hola again! Just did some more design work on the Io the past few days, now it has better sustain and gating and a octaving effect added, want to post the new schematic up but I want to finish the filter design first. Does anyone following this thread have experience with integrators or inverters as lowpass filters? Do tell?

[DavenPaget]

... CMOS 

[electricteeth]

Updated the design of the Io. Uses a 386 now.  c1, c2, c3, c4 and r1 can be changed for a wide variety of different sounds. C2 makes the octave and oscillation and can be omitted though I think it sounds much less interesting that way. The NPN transistor can be whatever for the most part. All of the ones I tried work in the same way but some sound slightly different. I went with a socket for mine and a GE transistor (ac127) but I may change it out for a silicone. I used this kind of pcb:
http://www.radioshack.com/product/index.jsp?productId=2102845
I tried to simulate it as best as possible with diylc. javascript:void(0);
After i built it I tried some filters to smooth out the sound a little, passive filters are crap for the end of this circuit so I moved onto active filters, which definitely cut the butter well. I tried some different ones. Different ways of doing lowpass, bandpass, highpass using the ti filter calc application and various op amps. From what I got they all do different things and can get crazy when you use 2 in tandem. Overall though, I just decided to stick with less knobs and use my eq pedal for this purpose. When i go through and re-redesign the circuit next week, I am going to attempt an MS-20 filter clone for it. (I think the swirling and oscillation will bring this circuit to a finish in a very nice way.) Does anyone have a good layout for this? Anyway, A FILTER IS A MUST!(In my opinion) but they all do different and widely varied things with this pedal. Soundclips later this week and wiring diagram for the layout impaired. Enjoy!