LOOK THE NEW INSANE DISTORTION SCHEMATIC

[j0shua]

to Transmogrifox:

Please let me know when you get the expresspcb...

and come on rate the song  

[Transmogrifox]

I haven't been able to download the song.  The connection times out.  i thought being able to click "save target as" would help, but so far it hasn't worked.  You can try to email it to me if you like.

[j0shua]

oh i see, hmmmm ok i try to send you tomorrow , or if you have MSN messenger i can send ya email me man....


BTW you have the expresspcb?

[j0shua]

THE INSANE DISTORTION FINAL RELEASE COMING SOON .....

IM WORKING ON NEW 1 ..... WHIT OCTAVE  BASED ON LM 386

also you guys remember the Runofgroove Big Daddy , well i do some mods on the pedal ( treble , and bass added )

[petemoore]

What surprized me is that a Jfet Buffer could clip 1n914's.
 I didn't think a pickup [HB] would have enough voltage to breakover the clipping threshold, and being as the buffer should be 1 to 1 [or close] to unity...can someone explain this...I don't think I'm imagining a different sound with / without diodes.
 For reference I'm talking about the Jfet and diodes portion of the Insane Distortion.

[j0shua]

To petemoore:

Did you build the unit ?
Did you make a sound check ... come on tell us my friend and post the sound if you do ....

hmmmm im going to try a tongle sw to on/off the diodes DIODES , also we can try whit Led Diodes 3mm or 1n4xx diodes series .....

[petemoore]

Just the first section...just the Jfet 'n diodes, seems to change a bit with the diodes out, so they must be clipping, I just didn't think guitar through a Jfet buffer would cause clipping voltage across 1n914's to ground.
 Got no board but enough to mount an IC socket in...was thinking about just making an old bookboard style build of it...lol.

[larseko]

Ok, so I got parts, but unfortunately I got 0.33uf caps instead of 0.47uf. As far as I have understood this will cause a more trebly tone in the input, but what if I change the other 0.47ufs to 0.33 as well? What will be the result? A terrible hell of crispiness? Just wondering if I should complete this tomorrow, and not wait for the 0.47uf caps... looks like this will be a pretty straightforward build.

And about the diode/0.1uf-cap that has been discussed... is the schematic (1.0e) correct now? Should the cap be between the jfet and the diodes or the other way around?

LE

[Transmogrifox]

I saw a schematic of a 4 or 5 component passive distortion that could be installed in a guitar that played on this.

Two things are working for us, here:  
1.  Some guitar outputs can peak over 1 V amplitude.
2.  A diode is nonlinear from 0V on up.  It's an exponential current voltage relationship, so imagine a resistor that gets exponentially less resistive with more applied voltage accross it.

Therefore, harmonic distortion can occur long before the diode gets to the "knee" of the exponential curve.  I'll bet you could detect audible distortion at 300 mV on a 1N914.

Now with the JFET buffer, it is likely that it is producing distortion with the way it's biased.  Usually a JFET buffer gate is biased at a couple volts up to V/2 to keep a healthy bias current going.  This JFET is pretty starved, and the diodes don't help, so it's an ideal candidate for interesting distortion.


j0shua:  I did get the express PCB file, but I have not downloaded ExpressPCB software yet.  I've just been busy.

[j0shua]

this is the last corection on insane dst .....

http://photobucket.com/albums/v669/teknoblaster/?action=view¤t=insanedst1f.jpg

[j0shua]

Transmogrifox:

Im going to send you the expresspcb file of the Distortion, is a little file, and you can get when you download the program

[Transmogrifox]

larseko--with the 4M input resistor, You could probably use anything from .001 uF to whatever--500 uF.  You would probably notice noise isssues more with larger caps.

Likely about the best combo on the input stage is a 10nF and change the 4 meg resistor to about 470k or so.  This will decrease DC drift and perhaps bring noise down a little, though I think the main source of noise in the circuit is the 386--and you can't do anything about that.

[j0shua]

i agree whit Transmogrifox

you can play whit the components ....

[j0shua]

The final Schematic is on the page ..... if anyone wana add mod is wellcome ......

[j0shua]

no new ideas? ...... come on guys!

i think we can put some octave effect from Pin #2 of the IC

[j0shua]

ok im start to made the pcb , so if anyonen wana give me a hand to end this project are wellcome

[petemoore]

For the gate R, i had a 1m there, so that's what I used.
 Ran the jfet diode part into a Rangemaster...this is a real nice 'pre' circuit IMO...sounds real twangy, I put in a Ge on one side...

[j0shua]

to petemoore:

cool, a new variant hehehehehe, mods are wellcome all the time, please put some sound demo ......

I love Lm386 , it's easy to play whit him , and very cheap ......

[j0shua]

Can some 1 build the PCB , i dunno why my expressSCH have .dll fail ....


thanks

[larseko]

Tonight I'll try to build this thing on perfboard, so if there's anything to add, please inform me I'll just try the latest schematics first (1.0f), and then maybe try to experiment with the input/output caps etc. I really hope the fet will work..

Again, thanks for all you people who contribute to this forum being such a resource!

Lars Erik