Proco - Brat

soulsonic · Post by **soulsonic** » 21 Jan 2010, 22:57

JHS wrote:A basic BRAT-schem can be found on this site.

http://www.happybob.com/rstrand/rat/rat_versions.htm

JHS

That page is full of inaccuracies.
I'm going to remember to grab mine out of storage soon and finally do a full CORRECT scheme of the Brat/Roadkill.

soulsonic · Post by **soulsonic** » 26 Jan 2010, 00:59

OK, I traced my original Roadkill today. I will get the schematic drawn and posted soon. Two things I can say right now: One, the existing "artist's impression" partial schematic is COMPLETELY WRONG - it isn't even close to reality. And two, this can totally be modded/reworked into a proper Rat/modded super Rat.

mollotof · Post by **mollotof** » 26 Jan 2010, 16:48

Hello all.
I'm trying to mod a Brat to have true Bypass switch.
I confirm that the "artist impression" is far from the reality.
I'm waiting for the schématic now...

soulsonic · Post by **soulsonic** » 27 Jan 2010, 01:51

mollotof wrote:Hello all.
I'm trying to mod a Brat to have true Bypass switch.
I confirm that the "artist impression" is far from the reality.
I'm waiting for the schématic now...

I will post the schematic later tonight. The "artist's impression" is totally wrong, especially the buffer and switching sections, which are 100%[/b] wrong in that drawing.

mollotof · Post by **mollotof** » 31 Jan 2010, 15:02

soulsonic wrote:I will post the schematic later tonight. .

3 days later...seems that soulsonic has forgotten us

(no, no, i'm not "impatient as a little child")

nbabmf · Post by **nbabmf** » 03 Feb 2010, 23:38

soulsonic wrote:...this can totally be modded/reworked into a proper Rat/modded super Rat.

Truth!

mollotof · Post by **mollotof** » 04 Feb 2010, 17:38

nbabmf wrote:
soulsonic wrote:...this can totally be modded/reworked into a proper Rat/modded super Rat.
Truth!

How ?
Schematics ? tutorial ?

soulsonic · Post by **soulsonic** » 06 Feb 2010, 19:51

Here is the schematic:
members/soulsonic/schematic/ProCoBrat_Roadkill.GIF
A savvy person can probably see several reasons why this thing doesn't sound very good.

mollotof · Post by **mollotof** » 07 Feb 2010, 09:28

Thanks for the schematics soulsonic.

Now if someone knows how to mod it into a soundy pedal, it will be perfect !!!!!

nbabmf · Post by **nbabmf** » 07 Feb 2010, 19:21

Pulling out those diodes in the feedback loop is a start. Clip'em like a Ruetz mod haha. It's the Ratz mod.

soulsonic · Post by **soulsonic** » 08 Feb 2010, 16:22

nbabmf wrote:Pulling out those diodes in the feedback loop is a start. Clip'em like a Ruetz mod haha. It's the Ratz mod.

That is a good start, but it needs alot more than that to be like a real Rat!

I will mod mine and take lots of pictures as I do it, so we can have a tutorial.

mollotof · Post by **mollotof** » 08 Feb 2010, 17:00

soulsonic the great wrote:I will mod mine and take lots of pictures as I do it, so we can have a tutorial.

That's a good news !

i've heard about replacing the "output" diodes (D5 & D6) by red Leds.
Or switching ONE of these diodes by two schottky diodes.

Dirk_Hendrik · Post by **Dirk_Hendrik** » 08 Feb 2010, 17:54

soulsonic wrote:Here is the schematic:
members/soulsonic/schematic/ProCoBrat_Roadkill.GIF
A savvy person can probably see several reasons why this thing doesn't sound very good.

You sure those switching FET's do not have any form of reference to half vcc on their sources and drains??
Amazing the switching will work anyhow like this!

analogguru · Post by **analogguru** » 08 Feb 2010, 18:05

Dirk_Hendrik wrote: You sure those switching FET's do not have any form of reference to half vcc on their sources and drains??
Amazing the switching will work anyhow like this!

Since two years I am pretty sure:
https://www.freestompboxes.org/viewtopic ... 802#p12802

analogguru wrote: After tracing the schematic I was really surprised :
Neither the drain nor the source have an DC-connection, so the FET seems to be floating - If and how this works nobody really knows.

So my question:
Is there somebody who owns a Proco Brat or Roadkill who can report me about his experience with the FET-switching or can take some photos for comparision ?

thanks in advance,
analogguru

My tracing matches that one from soulsonic.

analogguru

Dirk_Hendrik · Post by **Dirk_Hendrik** » 08 Feb 2010, 21:43

nbabmf · Post by **nbabmf** » 09 Feb 2010, 07:10

soulsonic wrote:
nbabmf wrote:Pulling out those diodes in the feedback loop is a start. Clip'em like a Ruetz mod haha. It's the Ratz mod.
That is a good start, but it needs alot more than that to be like a real Rat!

I will mod mine and take lots of pictures as I do it, so we can have a tutorial.

Sweet. Get at me on Facebook or something and we can compare notes. I have this cool hammered black/silver enclosure that I want to put mine in, but I don't mind taking my time and working with a partner on it. I want it to rival... no, PUMMEL the infamous Beavis FKR.

nbabmf · Post by **nbabmf** » 23 Feb 2010, 06:23

Would anyone here mind if I just cut the bottom part of this board off with a Dremel? It's going to be in the way of the 3PDT...

nbabmf · Post by **nbabmf** » 14 Apr 2010, 10:12

I finished this guy up a while ago and passed it onto someone looking for a cheap Rat. He recorded a demo!

DavidRavenMoon · Post by **DavidRavenMoon** » 06 Nov 2021, 07:14

Old thread, but you have to realize this pedal was designed to be sold to Guitar Center for like $15. Corners were cut. Also it was competing with the DOD Grunge.