I made my own version of the NuTube Screamer. It's a monster overdrive. Love the sound, with gain at 0 and mix at 0 it's a nice boost with tone adjust; with gain at 10 and mix at 10 (full NuTube) it's a tube distortion with lots of gain, powerful and a pleasant nice mid-range distortion with tube-like compression.
I also added the possibility to remove the soft clipping diodes, its effect it's more distinguishable with mix closer to 0.
Starting from this block diagram and the classic TS-808 I tried to implement a NuTube Screamer:
(http://www.ibanez.com/products/images/feat/4087.jpg)
(https://s18.postimg.cc/bluiwiabp/DSC04556.jpg) (https://postimg.cc/image/bluiwiabp/)(https://s18.postimg.cc/5kwtzgaut/DSC04561.jpg) (https://postimg.cc/image/5kwtzgaut/)
I created a Spice model of Nutube 6P1 triode using Koren's method and did a Spice analysis of the circuit:
(https://3.bp.blogspot.com/-kik0fLa76h4/WuhE2njC-6I/AAAAAAAANMo/W7nz01zRStsaPMjGRglYIxxPoZXBLQTwACK4BGAYYCw/s1600/NuTubeScreamer_spice_sch.png)
Here are the simulations results:
NuTube Screamer - Spice simulations (https://rezzonics.blogspot.fr/2018/05/nutube-screamer-spice-simulations.html)
I made schematics and PCB layout using Eagle CAD:
NuTube Screamer Schematics, BoM, layout and assembly (https://rezzonics.blogspot.fr/2018/05/nutube-screamer-schematics-bom-layout.html)
Here are some sound tests on Soundcloud:
NuTube Screamer pedal test Chords (https://soundcloud.com/rezzonics/sets/nutube-screamer-pedal-test)
NuTube Screamer pedal test Solo (https://soundcloud.com/rezzonics/sets/nutube-screamer-pedal-test-1)
And some videos:
Wow! This looks awesome! Are you planning on selling PCB's or anything of the sort? I would love to build this. :icon_mrgreen:
im more interesting in how to eagle to freecad tutorial :icon_wink:
Quote from: 287m on May 02, 2018, 03:20:20 AM
im more interesting in how to eagle to freecad tutorial :icon_wink:
You can start by downloading Freecad here:
https://www.freecadweb.org/wiki/Download
and eaglepcb2freecad module for Freecad here:
https://sourceforge.net/projects/eaglepcb2freecad/
and start creating your library of enclosures, buttons, potentiometers...
There are several webs that provide free 3D models, and many manufacturers too:
https://www.3dcontentcentral.com/
https://www.traceparts.com/en/search
Quote from: forsakenrider on May 01, 2018, 06:42:56 PM
Wow! This looks awesome! Are you planning on selling PCB's or anything of the sort? I would love to build this. :icon_mrgreen:
I have published schematics, BoM and layout here:
NuTube Screamer Schematics, BoM, layout and assembly (http://rezzonics.blogspot.fr/2018/05/nutube-screamer-schematics-bom-layout.html)
I will probably add source files to github too.
Some pictures of the PCB. I prefer to add switches and pots on PCB but I had some issues finding 9mm potentiometers with shaft long enough, so I had to file the buttons:
(https://s18.postimg.cc/41okrh305/DSC04490.jpg) (https://postimg.cc/image/41okrh305/)
(https://s18.postimg.cc/4r7d3uiz9/DSC04491.jpg) (https://postimg.cc/image/4r7d3uiz9/)