Rockfabrik - Mind Abuse Distortion

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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J0K3RX
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Post by J0K3RX »

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

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dv8r601
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Post by dv8r601 »

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.

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EmmG
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Post by EmmG »

It looks like a TL072 and a 1044 charge pump. From the video demos, the mode switch affects the midrange voicing/scoop.
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J0K3RX
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Post by J0K3RX »

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?

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hyrk
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Post by hyrk »

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!!
Sound like great high gain, need to follow that if Joker is on it ! 8)

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bool
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Post by bool »

I see a TO92-something in there. Maybe this makes "more" gain. Maybe not.

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YellowBoy
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Post by YellowBoy »

Screen grab of the PCB being routed. That T0-92 looks like voltage reg to me.
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Rockfabrik - Mind Abuse Distortion pcb
Rockfabrik - Mind Abuse Distortion pcb

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J0K3RX
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Post by J0K3RX »

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

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roseblood11
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Post by roseblood11 »

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.

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YellowBoy
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Post by YellowBoy »

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?

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Post by Circuitsmith »

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.

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bajaman
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Post by bajaman »

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
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Ichabod_Crane
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Post by Ichabod_Crane »

Sounds great! :twisted:

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dv8r601
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Post by dv8r601 »

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

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modman
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Post by modman »

Rockfabrik mindabuse gut shot
Rockfabrik mindabuse gut shot
Rockfabrik mindabuse gut shot
Rockfabrik mindabuse gut shot
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turbonigro
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Post by turbonigro »

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.

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temol
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Post by temol »

Anything new in the subject?

T.

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