Xotic - BB+

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

anybody trace one yet? Looks like the 'A' channel uses a single green LED and the 'B' channel uses a single 2N7000 for distortion 'color'.

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AL
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Post by AL »

telefone,

Check the top of the page in this section under announcements. There are a pile of schematics and gutshots.

AL

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telefone
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Post by telefone »

AL wrote:telefone,

Check the top of the page in this section under announcements. There are a pile of schematics and gutshots.

AL
Right, and this isn't one of them, so your point is?

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AL
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Post by AL »

telefone wrote:
AL wrote:telefone,

Check the top of the page in this section under announcements. There are a pile of schematics and gutshots.

AL
Right, and this isn't one of them, so your point is?
There is a shcem for an Xotic BB preamp. Is that not the same thing? My apologies for trying to be helpful. :roll:

AL

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telefone
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Post by telefone »

AL wrote:
telefone wrote:
AL wrote:telefone,

Check the top of the page in this section under announcements. There are a pile of schematics and gutshots.

AL
Right, and this isn't one of them, so your point is?
There is a shcem for an Xotic BB preamp. Is that not the same thing? My apologies for trying to be helpful. :roll:

AL
No, it's not the same thing. The BB+ has 2 channels and you can switch the order of them. The 2 channels are different than the original BB preamp (so I don't really understand the similar naming). There doesn't seem to be much interest in it.

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telefone
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Cow4prez
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Post by Cow4prez »

telefone wrote:anybody trace one yet
maybe you can be the first ;)
I wonder why they had to use 2 separate boards or just use a multilayer PCB. This seems more inefficient.

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YuGi
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Post by YuGi »

telefone wrote:anybody trace one yet? Looks like the 'A' channel uses a single green LED and the 'B' channel uses a single 2N7000 for distortion 'color'.
:hmmm: I quickly analyzed the pictures and does not seem to be so. Channel A has uno green LED + 2 diodes (one black like a 1N4001 and one ike a 1N914 but blue :scratch: ). Channel B has 2 blue diodes and 2 black diodes.
Someone knows more exactly the diodes used? I'm interested to a clone of this thing :mrgreen:

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Post by Jack Deville »

Who does the Xotic layouts?!
I'm a "professional."
Buy my products and make me rich.

www.jackdeville.com

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Post by MoonWatcher »

YuGi wrote:one ike a 1N914 but blue :scratch: ). Channel B has 2 blue diodes and 2 black diodes.
Someone knows more exactly the diodes used? I'm interested to a clone of this thing :mrgreen:
Blue diodes may indicate that they are Schottky barrier diodes. If you can get a number off of their bodies, you'll be good to go.

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YuGi
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Post by YuGi »

MoonWatcher wrote:
YuGi wrote:one ike a 1N914 but blue :scratch: ). Channel B has 2 blue diodes and 2 black diodes.
Someone knows more exactly the diodes used? I'm interested to a clone of this thing :mrgreen:
Blue diodes may indicate that they are Schottky barrier diodes. If you can get a number off of their bodies, you'll be good to go.
I find this photo on the net, unfortunately, only about A channel :mrgreen:
So I think the black diode is a 1N4005 :hmmm:, the blue one may be also a zener, but what means 46?
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IMG_1533.jpg

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Mike31
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Post by Mike31 »

Probably a BAT46 which is a Schottky.

That is definitely a different combo, a silicon/schottky against a green led.

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Post by YuGi »

Mike31 wrote:Probably a BAT46 which is a Schottky.

That is definitely a different combo, a silicon/schottky against a green led.
:applause:

B channel is probably silicon/schottky against silicon/schottky. :thumbsup

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Post by YuGi »

YuGi wrote:
Mike31 wrote:Probably a BAT46 which is a Schottky.

That is definitely a different combo, a silicon/schottky against a green led.
:applause:

B channel is probably silicon/schottky against silicon/schottky. :thumbsup
:hmmm: in the channal B circuit there is a transistor in series with the diodes (it seems that only pin 1 and 3 are connected).. maybe the 2N7000 mentioned by telefone?
Then the branchs are:
- 1N4005 - BAT46 -
- BAT46 - 1N4005 - 2N7000 -
:?:
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Channel_B.jpg
Channel_B.jpg (9.67 KiB) Viewed 3313 times

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Post by jimbob_400 »

YuGi wrote:
YuGi wrote:
Mike31 wrote:Probably a BAT46 which is a Schottky.

That is definitely a different combo, a silicon/schottky against a green led.
:applause:

B channel is probably silicon/schottky against silicon/schottky. :thumbsup
:hmmm: in the channal B circuit there is a transistor in series with the diodes (it seems that only pin 1 and 3 are connected).. maybe the 2N7000 mentioned by telefone?
Then the branchs are:
- 1N4005 - BAT46 -
- BAT46 - 1N4005 - 2N7000 -
:?:
That would be my guess also.

I wonder what was crossing their minds when they decided to put schottky, 1n and a mosfet together :hmmm:

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Post by YuGi »

I think to reach a particular "forward voltage drop".
There is another transistor in the channel A side, but it do not seems to be connected to the diodes.. maybe a buffer :hmmm:

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Post by jimbob_400 »

BB+2.jpg
BB+.jpg
Does anyone own one of these or have any more gut shots? We have some part values to find :D

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Post by jstbrowsin »

bumpty bump I hope someone responds to this I'm keen as to make this one. [smilie=a_teeth.gif]
kev01 wrote:This one wins the gooooooooooop award. That has more silicone than Pamela Anderson.

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Post by andrewwoo »

Has anyone built this? I've always wanted a standalone pedal of the Channel B side of the BB+. Not sure if it's even possible.

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