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PostPosted: 14 Feb 2008, 01:08
by 666
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.

Re:

PostPosted: 07 Oct 2008, 21:16
by Krinkle
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?

Re: Xotic - BB Preamp

PostPosted: 08 Oct 2008, 16:10
by kusi
hello,

this is a dual-pot!

regards, kusi

Re: Xotic - BB Preamp

PostPosted: 16 Oct 2008, 17:44
by twostring
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

Re: Xotic - BB Preamp

PostPosted: 17 Oct 2008, 04:08
by twostring
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

Re: Xotic - BB Preamp

PostPosted: 17 Oct 2008, 14:25
by ShortScaleMike
IC2 is missing a connection to pin4 for a kick-off

Re: Xotic - BB Preamp

PostPosted: 18 Oct 2008, 01:33
by twostring
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?

Re: Xotic - BB Preamp

PostPosted: 12 Nov 2008, 20:08
by Da Cat
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
da Cat

Re: Xotic - BB Preamp

PostPosted: 13 Nov 2008, 07:51
by kusi
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

Re: Xotic - BB Preamp

PostPosted: 13 Nov 2008, 17:07
by Da Cat
Thanks kusi, you the man :D
and the corected version:
Image
Image

Re: Xotic - BB Preamp

PostPosted: 15 Nov 2008, 14:55
by Da Cat
...and now this wersion is also verified!
works like charm!

Re: Xotic - BB Preamp

PostPosted: 11 Dec 2008, 05:58
by quaternotetriplet
Hi, what ic are on the original

Re: Xotic - BB Preamp

PostPosted: 13 Dec 2008, 03:00
by audioguy
I get an error trying to open the DIY file... anyone else?

Re: Xotic - BB Preamp

PostPosted: 13 Dec 2008, 04:07
by miklax
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

Re: Xotic - BB Preamp

PostPosted: 13 Dec 2008, 14:57
by Da Cat
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.

Re: Xotic - BB Preamp

PostPosted: 14 Dec 2008, 00:01
by quaternotetriplet
da cat, sorry to thread jack my diylc java version thus not have a library. what is the problem?? BTW, im using vista

BB Preamp, new layout!  [traced]

PostPosted: 28 Feb 2009, 16:58
by darkglass
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

Re: BB Preamp, new layout!

PostPosted: 28 Feb 2009, 18:06
by madbean
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.

Re: Xotic - BB Preamp

PostPosted: 18 Jun 2009, 11:19
by mrkaploca
Hello!
Can someone please tell what IC's and tranzistors are used for this pedal??

Re: BB Preamp, new layout!

PostPosted: 18 Jun 2009, 11:23
by mrkaploca
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