Xotic - BB Preamp  [traced]

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Postby 666 » 14 Feb 2008, 01:08

kusi wrote: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


Hello Kusi... in this schematic, is this 100k pot "Level A" along with the 47k resistor are OK or should I stick in the first schematic? And what about the 1uF-1k RC behind the "Level A" pot?

Thanks.
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Re:

Postby Krinkle » 07 Oct 2008, 21:16

kusi wrote: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


Why are there 2 level pots? I thought this was the original BB? Am I missing something?
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Re: Xotic - BB Preamp

Postby kusi » 08 Oct 2008, 16:10

hello,

this is a dual-pot!

regards, kusi
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Re: Xotic - BB Preamp

Postby twostring » 16 Oct 2008, 17:44

Any possibilities for a vero layout, or would vero be too difficult to manage? I'm trying to work on a very layout based on a TS vero layout I found, but there is much I don't understand. For the first op-amp stage, should the signal enter at the 5th or 6th pin? The vero layout I have for the tube screamer shows the signal entering at pin 3, but the schematic I have for the tube screamer shows the signal entering at pin 5. I understand you can use either op-amp, but what would make better sense when building up a circuit like the BB Preamp?

I'm trying here, but I have to admit there is a lot I don't understand here. I would like to see a layout by one of the gents here that has a bit more experience.

Thanks,

Chad
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Re: Xotic - BB Preamp

Postby twostring » 17 Oct 2008, 04:08

Well, I gave it a shot. Maybe one of you more experienced designers might improve on it. Either way, I'd like some feedback. This is the first layout I've completed (or really attempted for the most part). I started with a Screamer layout and used it as far as I could, and I continued with the vero layout for the active tone stack that was posted in a build report for the BB Preamp. The layout kind of falls apart after the second op-amp stage. I would appreciate any pointers or corrections, and I'd like to make the board shorter as well.

Hopefully I didn't miss anything, but here goes...

Image

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Re: Xotic - BB Preamp

Postby ShortScaleMike » 17 Oct 2008, 14:25

IC2 is missing a connection to pin4 for a kick-off
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Re: Xotic - BB Preamp

Postby twostring » 18 Oct 2008, 01:33

Just a quick question...anyone think about doing this one with a quad op-amp? It might make things a bit easier to arrange. Any negatives to this?
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Re: Xotic - BB Preamp

Postby Da Cat » 12 Nov 2008, 20:08

Hi!

This is a great forum!
Here is my little contribution...

I have modified layout from this thread:
http://www.freestompboxes.org/viewtopic.php?t=1770
I used this schematic:
http://forum.musikding.de/cpg/albums/us ... preamp.pdf

And here are the layout and PCB.
Image
Image

and also the diy file is added as the attachment.

I made it whit beta version of DIY layout creator (Java)

Feel free to comment. I haven't built it yet...
Can anyone tell me if it is corect?

thanx
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Re: Xotic - BB Preamp

Postby kusi » 13 Nov 2008, 07:51

hi,

i just checked the IC-Pinouts. IC1a is wrong in your layout, because i draw an error in the schematic as i wrote it before in this thread. please google for "non inverting op-amp stage", and you will see the basic function of IC1a.

regards, kusi
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Re: Xotic - BB Preamp

Postby Da Cat » 13 Nov 2008, 17:07

Thanks kusi, you the man :D
and the corected version:
Image
Image
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Re: Xotic - BB Preamp

Postby Da Cat » 15 Nov 2008, 14:55

...and now this wersion is also verified!
works like charm!
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Re: Xotic - BB Preamp

Postby quaternotetriplet » 11 Dec 2008, 05:58

Hi, what ic are on the original
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Re: Xotic - BB Preamp

Postby audioguy » 13 Dec 2008, 03:00

I get an error trying to open the DIY file... anyone else?
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Re: Xotic - BB Preamp

Postby miklax » 13 Dec 2008, 04:07

audioguy wrote:I get an error trying to open the DIY file... anyone else?

Cant open the file. either... :s

Can anyone post the offboard component connection to the board?

thanks
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Re: Xotic - BB Preamp

Postby Da Cat » 13 Dec 2008, 14:57

I made this pcb with diy layout creator beta (Java vesrion)
http://www.storm-software.co.yu/diylc/diylc_beta.zip

It is quite big, I will corect it when I have time.
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Re: Xotic - BB Preamp

Postby quaternotetriplet » 14 Dec 2008, 00:01

da cat, sorry to thread jack my diylc java version thus not have a library. what is the problem?? BTW, im using vista
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BB Preamp, new layout!  [traced]

Postby darkglass » 28 Feb 2009, 16:58

Hello, Im posting one layoout I designed with eagle for the BB Preamp, I used the schem traced by KHE founded in this forum...

So here it is!

Schem

Image

Layout

Image

And PCB

http://darkfinn.googlepages.com/BBPreampPCB.pdf

This layout is not verified though, I finished it yesterday, but Im quite sure it should work.

Best Regards

Douglas.

Enjoy
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Re: BB Preamp, new layout!

Postby madbean » 28 Feb 2009, 18:06

Nice work. There seems to be more than one version of this schem, though. It looks like the one you've got here came from a trace done by KHE in Jan 2006. But there is another trace from later that same year that has uses a dual 100k for volume control.

Attached below is a pdf I have of the second trace. I have a layout of this one, but it's double sided.
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Re: Xotic - BB Preamp

Postby mrkaploca » 18 Jun 2009, 11:19

Hello!
Can someone please tell what IC's and tranzistors are used for this pedal??
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Re: BB Preamp, new layout!

Postby mrkaploca » 18 Jun 2009, 11:23

darkglass wrote:Hello, Im posting one layoout I designed with eagle for the BB Preamp, I used the schem traced by KHE founded in this forum...

So here it is!

Schem
http://darkfinn.googlepages.com/BBSchem.jpg

Layout
http://darkfinn.googlepages.com/Layout.jpg

And PCB
http://darkfinn.googlepages.com/BBPreampPCB.pdf

This layout is not verified though, I finished it yesterday, but Im quite sure it should work.

Best Regards
Douglas.
Enjoy

sorry,what is 9V1 pin near the 9Vpower pin???Im a bit bad in electr. :oops:
and what are original IC's and tranzistors?Is this layout verified?
THNX
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