Xotic - BB Preamp  [traced]

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

Postby Goop_buster » 01 Aug 2007, 14:10

admin: merged in here from another thread:

greenskull wrote:I've been trying like hell to figure out what I could contribute here and remembered this from DIYstompboxes:
http://www.diystompboxes.com/smfforum/i ... ic=55014.0

Here's the schematic:


LA Boutique Screamer JPG schematic

I created an image file from the original pdf. Hope it works out!!



And for reference...accordring to JHS that schematic is not an 100% exact copy of the BB.
Is it is a work-a-like design by k*** which is very close and got the same baxandall-EQ and so on.
User avatar
Goop_buster
Solder Soldier
 
Posts: 248
Joined: 22 Jul 2007, 23:31
Has thanked: 0 time
Have thanks: 5 times

Postby modman » 01 Aug 2007, 14:25

Maybe all of them are related in design. It's getting boring, all those tubescreamer clones. Somebody want to spice up the Frantone thread? There's a link to a Fran picture!

Goop_buster wrote:And for reference...accordring to JHS that schematic is not an 100% exact copy of the BB.
Is it is a work-a-like design by k*** which is very close and got the same baxandall-EQ and so on.


K.U.S.I. kusi - "kusi" - *kusi*

This guy's name doesn't get past the inherent forum filters. Found something in a page on Finnish profanity :shock:

http://en.wikipedia.org/wiki/Finnish_profanity

"K u s i, pronounced /k u s i/ or like "c o o s y" in English, means "u r in e" with a similar connotation as "p i s s". Used by itself, the word almost always refers to actual u r i ne and is considered only mildly offensive in colloquial language. Compound words, such as "kusipää" (piss head) are very offensive insults. Children often use "pissa" as a tame replacement word. The word pissa has drifted so far into everyday usage that in combined form "pissapoika" (pissing boy) it refers specifically to the squirter on the windshield of cars. Several foreign visitors have been amused by the product "Superpiss" for windshield wiper fluid."

a lot of other words do get through. Why this Finnish word not?
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
User avatar
modman
a d m i n
 
Posts: 4246
Joined: 19 Jun 2007, 17:57
Has thanked: 2887 times
Have thanks: 495 times

Postby JHS » 01 Aug 2007, 15:04

kusi is "short" for "Markus" nothing more...
JHS
JHS
Cap Cooler
 
Posts: 485
Joined: 14 Jul 2007, 12:20
Has thanked: 0 time
Have thanks: 3 times

Postby JHS » 01 Aug 2007, 15:36

My twist on the X-drive, add an TS-9 O-buffer if you like, to get closer to the original.

http://s206.photobucket.com/albums/bb41 ... XDRIVE.gif

JHS
JHS
Cap Cooler
 
Posts: 485
Joined: 14 Jul 2007, 12:20
Has thanked: 0 time
Have thanks: 3 times

Postby Goop_buster » 01 Aug 2007, 15:39

JHS wrote:My twist on the X-drive, add an TS-9 O-buffer if you like, to get closer to the original.

http://s206.photobucket.com/albums/bb41 ... XDRIVE.gif

JHS


Thanks JHS. What software do you use for schematics?
User avatar
Goop_buster
Solder Soldier
 
Posts: 248
Joined: 22 Jul 2007, 23:31
Has thanked: 0 time
Have thanks: 5 times

Postby JHS » 01 Aug 2007, 17:07

MS Paint and copy and paste.

I have the basic symbols as a template (buffers, tonestacks, trannies, R, C ...) so it doesn't take to much time.
It's much faster than generating the schems with my CAD-software.

JHS
JHS
Cap Cooler
 
Posts: 485
Joined: 14 Jul 2007, 12:20
Has thanked: 0 time
Have thanks: 3 times

Postby greenskull » 01 Aug 2007, 21:25

Well at least we've gotten a non-English cuss words lesson from this thread. :oops:

Modman, feel free to move this thread or destroy it.
User avatar
greenskull
Resistor Ronker
 
Posts: 261
Joined: 03 Jul 2007, 23:47
Has thanked: 36 times
Have thanks: 9 times

Postby gnognofasciani » 18 Sep 2007, 18:43

Does anybody have a pcb/layout?

Just not to work in vain...

Thanks!
User avatar
gnognofasciani
Solder Soldier
 
Posts: 161
Joined: 04 Aug 2007, 16:23
Location: nuburia
Has thanked: 4 times
Have thanks: 11 times

Postby modman » 19 Sep 2007, 14:41

gnognofasciani wrote:Does anybody have a pcb/layout?

Just not to work in vain...

Thanks!


Haven't seen one yet, maybe because of the TS similarity. Do have a look at the similarities between RC/AC/BB, you might be able to make a layout to be used with either of the three.

Haven't looked into this on schematic level yet, sorry. Trying to get some stuff done this week and it's looking bad already :wink:

keep us posted.
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
User avatar
modman
a d m i n
 
Posts: 4246
Joined: 19 Jun 2007, 17:57
Has thanked: 2887 times
Have thanks: 495 times

Postby gnognofasciani » 19 Sep 2007, 15:07

As far as I can see BB uses non inverting input for the clipping stage and AC the inverting one (is the AC the "Japxotic booster"?), so it won't be easy to draw a universal layout...

I'll see what I can do :wink:
User avatar
gnognofasciani
Solder Soldier
 
Posts: 161
Joined: 04 Aug 2007, 16:23
Location: nuburia
Has thanked: 4 times
Have thanks: 11 times

Postby pakalolo » 20 Sep 2007, 12:05

Hello,

Never found a layout for this one.
It's quite close to a TS808 so I built mine using the GGG ts808 PCB.
I added an extra veroboard for the active tonestack.
pakalolo
 
Posts: 13
Joined: 29 Jun 2007, 08:36
Location: France
Has thanked: 7 times
Have thanks: 0 time

Postby gnognofasciani » 20 Sep 2007, 12:12

There's one thing i can't understand: is there any difference between using an inverting or a non inverting input for the clipping stage?
User avatar
gnognofasciani
Solder Soldier
 
Posts: 161
Joined: 04 Aug 2007, 16:23
Location: nuburia
Has thanked: 4 times
Have thanks: 11 times

Postby JHS » 20 Sep 2007, 13:03

There is a slight difference in tone and IMHO the inverting input deliver a better reaction to the guitar vol. and picking nuances.

JHS
JHS
Cap Cooler
 
Posts: 485
Joined: 14 Jul 2007, 12:20
Has thanked: 0 time
Have thanks: 3 times

Postby snail » 16 Dec 2007, 11:47

can you guys count 3 transistors instead of 2 indicated in the current schematic.

on the ungooped gutshot provided by AG there is what apears to be another transistor, or Fet..., the one in the upper left corner left of the electrolitic cap.

any takers???

Played one of these last friday, not very impressed, but I can see why TS players will dig that one.

snail
snail
Solder Soldier
 
Posts: 203
Joined: 30 Aug 2007, 01:41
Has thanked: 0 time
Have thanks: 1 time

Postby sosodef » 16 Dec 2007, 13:13

I have one of these BB preamps. I was never too too impressed with it. The main reasons are:

Its overly compressed. It doesn't respond well with dynamics of your playing/picking. It never really does that great of a boost a bit too dirty still. Lastly the gain becomes a bit too loose sounding as you get past say 10 oclock.

I have had thoughts of pulling out the heatgun and trying to make it a better pedal. Is this pedal ready for mods?
sosodef
Solder Soldier
 
Posts: 163
Joined: 26 Oct 2007, 05:14
Has thanked: 0 time
Have thanks: 0 time

Postby modman » 16 Dec 2007, 15:39

Schematic links seems to be dead, IIRC this was the schematic being discussed:

Image
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
User avatar
modman
a d m i n
 
Posts: 4246
Joined: 19 Jun 2007, 17:57
Has thanked: 2887 times
Have thanks: 495 times

Postby kusi » 16 Dec 2007, 16:00

hi,

the third transistor is a mosfet and it switches the led.

regards, kusi
User avatar
kusi
Breadboard Brother
 
Posts: 108
Joined: 15 Aug 2007, 21:45
Has thanked: 0 time
Have thanks: 34 times

Postby snail » 16 Dec 2007, 16:04

Thanks Kusi and Modman!

snail
snail
Solder Soldier
 
Posts: 203
Joined: 30 Aug 2007, 01:41
Has thanked: 0 time
Have thanks: 1 time

Postby modman » 16 Dec 2007, 16:59

snail wrote:Thanks k**i and Modman!

snail


No way, all credit to K u s i , didn't know he drew it.
Replaced the links throughout the thread.
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
User avatar
modman
a d m i n
 
Posts: 4246
Joined: 19 Jun 2007, 17:57
Has thanked: 2887 times
Have thanks: 495 times

Postby kusi » 16 Dec 2007, 17:52

the L.A. Boutique-Screamer is a little bit modified...

here you find the original BB:
http://forum.musikding.de/cpg/displayim ... 4&pos=-424

(+ and - inputs of the gainstage are in wrong direction... ;)


regards, ksui
User avatar
kusi
Breadboard Brother
 
Posts: 108
Joined: 15 Aug 2007, 21:45
Has thanked: 0 time
Have thanks: 34 times

PreviousNext

Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: Alexa [Bot], electrosonic, samthinguy and 6 guests