Crush N Blend Rev 6 V3 (CNB / Wet-Dry Circuit) + Support

livingnote

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Aug 12, 2007
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Location
Berlin, Berlin
Working on a new SMD version here :)

SMDCNBDesign2.png


In this version, I opted to go with these more simple Bourns Trimmers with J-Hooks:

BournsTrimmers.jpg


But what's handy is that there is exactly enough space there to also go with some multi-turn
trimmers like the Vishay T63-YA in case you want more precision and less drift over time.
 

MichaelD

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Joined
Jul 17, 2014
Messages
4
It's been more than 120 days, is this board still available?
Livingnote pm box is full.

If anyone is still visiting, does anyone know of a wet dry solution for thee gssl?

Thanks!
 

lars on

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Joined
Nov 18, 2018
Messages
72
Hi livingnote,


Thank you very much for this mod !

I'm making one and have some troubles.

Nothing goes out when switched on.

I'm not sure about the resistors "FBR", what this means ?
I'm not sure about the polarity of the two 1u cap, not clear on the schematic.
I have been able to track the signal until the 22u cap before the NE5532 OUTPUT.
After that the signal is very very low.

And just to be clear, the trimmers are to balance the signal gain between dry and wet isn't it ?

Thank's for any clue !
Cheers

Lars

 

lars on

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Nov 18, 2018
Messages
72
FOUND !!! ;D

The output NE5532 was not feed with +15V.
There was a missing track.
Don't konw why...
See the pic.

Now I heard a problem with the stereo.
I mean when the wet/dry pot is at center position, mix 50/50,
the signal become mono and +6db.
Dry position stereo is good but -6db.
Wet stereo is goos but -6db.

Maybe left right are swapped somewhere... ?
 

lars on

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Nov 18, 2018
Messages
72
I confirm that the Dry Left and Right are swapped from the wiring guide.

Now the board works well.
 

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livingnote

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Aug 12, 2007
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Location
Berlin, Berlin
Hey Lars thanks for reiterating the issues - looks like we got them all squashed now.

Patrik had the same problem and we traced them to the same issues you found - wiring
guide and etch documents have been updated and hopefully everything should be working
now, but thanks a ton for being part of the general trying-out of V6.

I'll gladly give you a proto etching session for your work. Just let me know what you
need and you can have 3 medium size boards of the same type free.

Update for everyone with the trimmers:

I have standard here 5K FBRs (Feedback Resistors) with 10K Trimmers on the input
and 10K FBRs with 20 or 22K Trimmers on the outputs, generally (when you want to
be able to trim neg and pos) and you can also just put in a wire link where the FBRs go
and use 20K trimmers on the input and 40-50K trimmers on the output if you need
to have the full range.
 

innercityman

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Joined
May 12, 2016
Messages
249
Location
France
Hi Lukas,

long time I left this project without solving my issue about +6db on right side when C N B engaged, but with the actual world pandemic, I have time to work on it again...

So I have a simple question... Does your wiring guide applies to GSSL with turbo board ? Mine has TB permanently installed (no on/off switch). I had issue with the TB when installing it and I had to change resistors values that didn't mach between GSSL board and TB board to get L and R side balanced. So, as I have left side -6db when C N B engaged, does that means that I should have taken my left side connexions to C N B from turbo board instead of GSSL board ? At least wet connexion ? Just know that whatever dry or wet knob position it is the same... As soon as C N B engaged, +6db on right side. Maybe dumb question but I've been using my unit without the benefit of the C N B since I installed it because of this unusable 6 db difference from one side to the other.

Did someone ever experience the same problem ?
 

livingnote

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Joined
Aug 12, 2007
Messages
1,048
Location
Berlin, Berlin
Not sure - and sorry everybody for not being on it more than I was of late
but been rooting around here just getting things working so that the studio
crazies are happy and I can get on with my newly limited job of focusing on
this exact DIY stuff and making PCBs for you guys.
 

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