Xotic - BB Preamp  [traced]

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

Here are the:

Xotic BB preamp guts

enjoy,
analogguru

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pakalolo
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Post by pakalolo »

(admin edit: merged from another thread)
call1800ksmyazz wrote:This was posted on DIYstompboxes a while ago before my real account got banned :lol: . Actually, I think the actual posting of this schematic and me taking part in the discoussion was part of the reason for Aron getting pissed at me :lol:

Schem:
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Kerry
This schem is not AC nor RC but BB Preamp I think.......

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tuemmueh
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Post by tuemmueh »

pakalolo wrote:This schem is not AC nor RC but BB Preamp I think.......
+1

But if I remember correctly (like I said, no need for TS here, I love my 30$-Rat ...), the only difference between BB/AC/RC is the number of diodes.

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panday44
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Post by panday44 »

call1800ksmyazz.......thank you very much for the schematic. I've been searching for this for a long time..... :D :D :D .....
....Its working properly..and i did'nt remove the tone control of TS : :lol: :lol: ....
and I add the clipping diode...(tuemmueh...thanks for the tips!!!! :D ) ..

and now i will call this pedal "LANDXOTIC".......(you want a gut shot!!! :lol: :lol: )



Again thank you very much....KERRY and TUEMMUEH !!!!!!more schematic to come...and THANKS "FREESTOMPBOXES" :D :D :D

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call1800ksmyazz
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Post by call1800ksmyazz »

Thanks, and no problem panday44. Glad you are enjoying!

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analogguru
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Post by analogguru »

Some month´s ago I saved some pictures but couldn´t really say what they are. So I stored them under "Fulltone". After reading this thread:
http://www.freestompboxes.org/viewtopic.php?t=137
and this thread:
http://www.freestompboxes.org/viewtopic.php?t=134
I rechecked the pictures and compared them to the pictures in the link above, and it seems that the picture are the guts of the:
Xotic BB preamp (gooped)

Xotic BB preamp (un-gooped)

this appears to be the corresponding BB Preamp schematic
viewtopic.php?f=7&t=11&p=50413#p50413

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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call1800ksmyazz
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Post by call1800ksmyazz »

Why didnt you just change the name of my thread and add your info there? :lol:

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Post by analogguru »

Maybe somebody wants to place a RC/AC Boost schematic in the future or some guts ? :roll:

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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kagaxdx
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Post by kagaxdx »

Some month´s ago I saved some pictures but couldn´t really say what they are. So I stored them under "Fulltone". After reading this thread:
http://www.phpbbserver.com/freestompbox ... stompboxes
and this thread:
http://www.phpbbserver.com/freestompbox ... stompboxes
I rechecked the pictures and compared them to the pictures in the link above, and it seems that the picture are the guts of the:
Xotic BB preamp (gooped)
Xotic BB preamp (un-gooped)
this appears to be the corresponding:
Xotic BB Preamp schematic
analogguru
I have those ones(gooped/un-gooped) saved here as the VOODOLABS SPARKLE DRIVE... :?

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analogguru
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Post by analogguru »

If you look at the:
blown up Xotic BB-Preamp guts
you can recognize the same track-routing, the cables to the switch in the middle bottom, cables to the pots on the upper side, the 2 electrolytics at the left, the placement of the IC´s.....

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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JHS
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Post by JHS »

You can get nearly the same sound and overtones out of any TS if you you drop the voltage to app. 8V.

To me the BB sounds to compressed, even more than a TS or SD.

The schem was drawn by Kusi, who altered it a bit (he dropped an IC stage, and altered the gain control to a single pot).

JHS

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invictus
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Post by invictus »

woooot!!!

JHS in da house! :D :o

big welcome sir! glad you could join us here.


looking forward to your prolific posts. :wink:



...

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Post by Goop_buster »

JHS wrote:You can get nearly the same sound and overtones out of any TS if you you drop the voltage to app. 8V.

To me the BB sounds to compressed, even more than a TS or SD.

The schem was drawn by k**i, who altered it a bit (he dropped an IC stage, and altered the gain control to a single pot).

JHS

Is there a PCB layout for this also?

Did the schematic author also (k***) change some values in the (baxandall) tone stack?

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Post by grolschie »

Goop really annoys me.

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Post by Goop_buster »

grolschie wrote:Goop really annoys me.
Thanks :wink:

To annoy you some more. With the given tone stack values there are plenty of boost and cut (ca 20 dB for bass and may be less...16 dB on treble) but the action (as I recognize it...however I may be wrong) are choosen for both very low frequencys and very high. In other words,the EQ looks almost taken from a circuit for hi-fi rather than something optimal for guitar. It just made me wonder if the values were the same as in the original. But I have not tried a real BB and it may work very nice IRL. Perhaps the BB is intended for Bass guitar also?

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JHS
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Post by JHS »

The values of the tonestack had not been changed.

JHS

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Post by Goop_buster »

JHS wrote:The values of the tonestack had not been changed.

JHS
Thanks JHS :)

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Post by greenskull »

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

Here's the schematic:
Image

LA Boutique Screamer JPG schematic

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

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call1800ksmyazz
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Post by call1800ksmyazz »

haha we already have this posted in 2 other places on the forum. Its for the BB Preamp.

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briggs
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Post by briggs »

Ah, nevermind. It's cool that everyone is contributing all their knowledge.
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I am Klon.

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