Rockfabrik - Mind Abuse Distortion

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

Rockfabrik - Mind Abuse Distortion

Postby J0K3RX » 18 Jun 2017, 23:06

I found some gut shots on the net and this one has me a bit stumped..? Sounds Huge though and has massive gain!!

Link

For this message the author J0K3RX has received thanks:
dv8r601 (20 Jun 2017, 07:31)
User avatar
J0K3RX
Degoop Doctor
 
Posts: 989
Joined: 29 Jun 2011, 02:25
Location: US Florida
Has thanked: 306 times
Have thanks: 469 times

Re: Rockfabrik - Mind Abuse Distortion

Postby dv8r601 » 20 Jun 2017, 07:35

I'm so damn glad you posted this. I had been looking for the name of this for a while. I saw a demo a bit ago but forgot the name altogether. I assumed it was a 386 design like the krank distortus maximus / protone body rot. Now I am guessing its more a modded Marshall type design a la guv'nor or something. No info to help but I am very interested in this one as well.
dv8r601
Breadboard Brother
 
Posts: 56
Joined: 08 Oct 2011, 08:28
Location: Mississippi
Has thanked: 304 times
Have thanks: 12 times

Re: Rockfabrik - Mind Abuse Distortion

Postby EmmG » 20 Jun 2017, 12:10

It looks like a TL072 and a 1044 charge pump. From the video demos, the mode switch affects the midrange voicing/scoop.
Image

For this message the author EmmG has received thanks: 7
Belanger88 (27 Jun 2017, 09:39), bmxguitarsbmx (14 Jan 2018, 23:06), dv8r601 (21 Jun 2017, 00:38), emilpaulsrud (22 Jun 2017, 12:32), Manfred (20 Jun 2017, 13:58), modman (23 Jun 2017, 10:12), nexion777 (26 Jun 2017, 23:44)
EmmG
 
Posts: 44
Joined: 11 Nov 2012, 03:03
Has thanked: 16 times
Have thanks: 23 times

Re: Rockfabrik - Mind Abuse Distortion

Postby J0K3RX » 21 Jun 2017, 16:00

Yeah... Seems like allot of resistors, caps and diodes for one TL072 but I guess they could be a part of the tonestack or something? Has a hell of allot of gain for one dual opamp which makes me wonder what is on the other side of the board :hmmm: I have seen all kinds of gut shots and even the raw un-populated boards but not even one shot of the other side... maybe some SMD hiding out over there like FET's or somethin?

For this message the author J0K3RX has received thanks:
hyrk (26 Jun 2017, 15:47)
User avatar
J0K3RX
Degoop Doctor
 
Posts: 989
Joined: 29 Jun 2011, 02:25
Location: US Florida
Has thanked: 306 times
Have thanks: 469 times

Re: Rockfabrik - Mind Abuse Distortion

Postby hyrk » 26 Jun 2017, 15:48

J0K3RX wrote:I found some gut shots on the net and this one has me a bit stumped..? Sounds Huge though and has massive gain!!

Link


Sound like great high gain, need to follow that if Joker is on it ! 8)
User avatar
hyrk
 
Posts: 5
Joined: 23 Nov 2012, 11:49
Has thanked: 17 times
Have thanks: 1 time

Re: Rockfabrik - Mind Abuse Distortion

Postby bool » 27 Jun 2017, 12:36

I see a TO92-something in there. Maybe this makes "more" gain. Maybe not.
bool
Breadboard Brother
 
Posts: 75
Joined: 01 Feb 2008, 02:06
Has thanked: 0 time
Have thanks: 11 times

Re: Rockfabrik - Mind Abuse Distortion

Postby YellowBoy » 27 Jun 2017, 13:43

Screen grab of the PCB being routed. That T0-92 looks like voltage reg to me.
You do not have the required permissions to view the files attached to this post.

For this message the author YellowBoy has received thanks: 2
FiveseveN (11 Jan 2018, 11:29), modman (13 Jan 2018, 23:20)
YellowBoy
 
Posts: 23
Joined: 01 Jan 2013, 19:42
Location: Derry, Ireland
Has thanked: 9 times
Have thanks: 37 times

Re: Rockfabrik - Mind Abuse Distortion

Postby J0K3RX » 28 Jun 2017, 17:44

YellowBoy - Great find on the pcb routing screen shot! Yeah, that looks like a voltage doubler or charge pump, whatever you wanna call it..

For this message the author J0K3RX has received thanks:
YellowBoy (28 Jun 2017, 19:03)
User avatar
J0K3RX
Degoop Doctor
 
Posts: 989
Joined: 29 Jun 2011, 02:25
Location: US Florida
Has thanked: 306 times
Have thanks: 469 times

Re: Rockfabrik - Mind Abuse Distortion

Postby roseblood11 » 29 Jun 2017, 01:19

You can see some more details in that video, and in the demos from Brett Kingman. I'm not sure, if there are components on the other side, maybe just some connectors.
The design reminds me of the Emma Pisdiyauwot.
roseblood11
Opamp Operator
 
Posts: 1710
Joined: 23 Aug 2008, 15:21
Has thanked: 330 times
Have thanks: 304 times

Re: Rockfabrik - Mind Abuse Distortion

Postby YellowBoy » 29 Jun 2017, 18:39

Yip...that routing pic shows placeholders for what looks like trimmers. You can see them very briefly in the video as well. There's definitely more going on under that PCB that we know about. Starting to see more black solder masks these days. Is that their way of making traces more difficult I wonder?
YellowBoy
 
Posts: 23
Joined: 01 Jan 2013, 19:42
Location: Derry, Ireland
Has thanked: 9 times
Have thanks: 37 times

Re: Rockfabrik - Mind Abuse Distortion

Postby Circuitsmith » 29 Jun 2017, 18:48

It seems that opamps are connected as buffers because pin 1 & 2 connected together as well as pins 6 & 7.
So no gain there.

The routing image may also have wrong tracing on purpose.

For this message the author Circuitsmith has received thanks: 3
dv8r601 (07 Jul 2017, 00:44), J0K3RX (30 Jun 2017, 04:27), nexion777 (02 Jul 2017, 18:19)
Circuitsmith
 
Posts: 1
Joined: 29 Jun 2017, 07:44
Has thanked: 0 time
Have thanks: 3 times

Re: Rockfabrik - Mind Abuse Distortion

Postby bajaman » 11 Jan 2018, 09:22

looks like the gain is performed by the 4 fets ? Very high voltage quadrupling power supply - the TL072 is just input and output buffers perhaps ?
ma2.png
You do not have the required permissions to view the files attached to this post.
be kind to all animals - especially human beings

For this message the author bajaman has received thanks: 2
bmxguitarsbmx (14 Jan 2018, 23:06), dv8r601 (11 Jan 2018, 18:51)
User avatar
bajaman
Old Solderhand
 
Posts: 4186
Joined: 26 Jun 2007, 22:18
Location: New Brighton, Christchurch, NZ
Has thanked: 372 times
Have thanks: 1093 times

Re: Rockfabrik - Mind Abuse Distortion

Postby Ichabod_Crane » 11 Jan 2018, 11:25

Sounds great! :twisted:
User avatar
Ichabod_Crane
Breadboard Brother
 
Posts: 66
Joined: 26 Apr 2016, 16:11
Has thanked: 6 times
Have thanks: 4 times

Re: Rockfabrik - Mind Abuse Distortion

Postby dv8r601 » 11 Jan 2018, 18:58

Now this makes WAY MORE sense. They let slip those early guts to muddy the water. Its a damn good thing we have people like Bajaman that keep up the search for these kinda things. One observation on the 2nd (Bajaman) gut shot: they used the tiny ass smd trim pots with Thru hole Fets. Am I the only one who thinks that is kinda silly. I know these smd trim pots are really inexpensive and manufacturing cost plays into a product but it looks ridic
dv8r601
Breadboard Brother
 
Posts: 56
Joined: 08 Oct 2011, 08:28
Location: Mississippi
Has thanked: 304 times
Have thanks: 12 times

Re: Rockfabrik - Mind Abuse Distortion

Postby modman » 13 Jan 2018, 23:22

rockfabrik_mindabuse_003.jpg

g6-thumb.jpg
You do not have the required permissions to view the files attached to this post.
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)

For this message the author modman has received thanks:
bmxguitarsbmx (14 Jan 2018, 23:06)
User avatar
modman
a d m i n
 
Posts: 4276
Joined: 19 Jun 2007, 17:57
Has thanked: 2959 times
Have thanks: 519 times

Re: Rockfabrik - Mind Abuse Distortion

Postby turbonigro » 12 Feb 2018, 13:15

Could be wrong but to me looks like a Joe Davisson Vulcan Overdrive with gyrator filters and output fet buffer. Not sure about the filters.

For this message the author turbonigro has received thanks:
nexion777 (12 Feb 2018, 21:12)
turbonigro
 
Posts: 21
Joined: 28 Mar 2010, 13:24
Has thanked: 0 time
Have thanks: 2 times


Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: apollomusicservice, elitem, Ichabod_Crane and 7 guests