"Flip-n-Morph" (the next episode of the "Crush-n-Blend")

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clintrubber

Well-known member
Joined
Jun 3, 2004
Messages
5,982
Location
The Netherlands
Hi,

In these dark economic times we should be careful with resources
& re-use as much as possible. How about that for a first line ?  ::)

But what I actually want to say: blend-circuits like the original circuit
of SSLtech-Keith and the unbalanced version of Livingnote-Lukas can easily
be used for a bit more than 'just' crossfading.

Dunno if has been mentioned before already, but for instance the PCBs
that I got from Lukas (see further on in this thread: http://www.groupdiy.com/index.php?topic=8360.0 & thanks again) beg to be used in a multi-purpose box.

We know that as designed these can crossfade between two stereo sources, like for
instance the dry & wet signal of a compressor.


Adding just a few additional things nicely expands the possibilities:

#1.
With an added SPDT-switch the PCB can be a neat Mid/Side-encoder/decoder as well.

#2.
With another switch (DPDT) and an added mono-pot you can select dual-mono or stereo crossfading. The former handy for pedalboards for instance.

etc, etc, various added modes will be possible


Lastly, because of the stand-alone character of the unit I've added a few 'utility'-resistors:
100 Ohm series resistors and 100k tie-down resistors at the output. I've kept the DC-coupled inputs, but you can add AC-coupling if you want. And if you want you can add reversed diodes to the supply rails for protection. And HF-filtering etc etc but then it's about time for an expanded PCB.


Let's call it the "Flip-n-Morph" TM


All in all, it's fun to see that simple variations w.r.t. addition/subtraction as realized by a few opamps & resistors can result in circuits fulfilling all kinds of different functions.
But since the required circuits are quite alike it's both tempting & easy to make them behave in different modes at the flick of a switch (in combination with a 'smart I/O' configuration).

The info above and the schematics from Keith & Lukas will be enough to derive the schematic, but I will nevertheless post a schematic v'soon.

(Let me add right away already that it'll be for own use only;
no money-making from it please, otherwise massive doom will be on your path-of-life  ;) )


Enjoy & feel free to chime in with ideas for added modes  :)


Bye,

  Peter
 
This schem (from the patent that pucho linked in his "SFXspeakers" thread) could also serve as an isnspiration.

http://www.google.com/patents?id=xbUGAAAAEBAJ&pg=PA5&zoom=4&dq=6219426

btw. I think there's some mistakes in the schemo (opamps +/-) - meaning if you build it right, they can't sue you 8)
 
Hi,

Yes, I had seen that one, patent offices remain amazing things  ;D

Which makes me realize that I should have added that the proposed
re-use of the CnB for a Mid/Side-encoder/decoder does so when the blend-pot is fully CW.

But in addition to that, the pot makes the stereo-width adjustable, like for instance the third Uneeda circuit:

http://www.uneeda-audio.com/mat03.gif
http://www.uneeda-audio.com/mat03.pdf


(the Flip-n-Morph TM is functionally equivalent to the Uneeda-#3 circuit, but blends/combines the signals differently)

Bye,

  Peter

 
Now this is why it's so darn cool to be out here and send boards around, lordy.

Don't have time to get into thinking mode (right between productions) but you did
it, and it's growing, too  :D

Calls for Rev3, dunnit?
 
livingnote said:
Calls for Rev3, dunnit?

Ha, might indeed be fun to make this an evolving design, as in: always ready to go, but also always under construction ('livingboard'  ;) )

It's of course up to you and the new PCB-fab to determine what would work best:

*1* one PCB-design fits various applictions, so user-configurable

*2* different dedicated PCB-designs, so each for a fixed application: PCBs themselves with less overhead
(= less potential confusion) but more different PCB-types on stock

I'd say that *1* is most fun.
And note that *1* could of course always be used to make a fixed functionality circuit,
without the added controls (builder-configurable).

Any ideas for additional new modes anyone ?

Bye,

  Peter

 
hi

i was thinking about that for a external unit too...

clintrubber (btw thx for the work on the supersdchain board  ;) )

could send a image/drawing/schemo on the added component you suggested ?

correct me if i'm wrong :
in m/S mode, you send the same stereo signal to both input & flip one.
so with a DPDT :
position 1 >
input L1 >> input L1
input R1 >> input R1

position 2 >
input L1 >> input L1
            >> input R2
input R1 >> input R1
            >> input L2

is it possible to get unity gain between normal & M/S mode ?


#2.
With another switch (DPDT) and an added mono-pot you can select dual-mono or stereo crossfading.

i don't get exactly what you mean (bad english) ?
can explain ? schemo ?

thanks a lot guys  ;D



 
How about panning? We're dumpling around in crossfaders, matrices and summers, oh my, what about a panner to boot?

Just disassembling one of my Neumann panning units, these have the best pan behavior I've ever seen...
 
bassculture said:
hi

i was thinking about that for a external unit too...
I just realized that SSLtech-Keith originally presented the CnB as an external unit (see for instance the balanced I/O),
proposing it not to tie it always to a cetain box (ehhh, the GSSL comes to mind  ;)
Then understandably people still went on putting it in the same box as the to be crushed processor.
And now we come talking about external versions, but it's of course nothing new. End of history-lesson  ;)

clintrubber (btw thx for the work on the supersdchain board  ;) )
My pleasure, enjoy. Note me just the two forbidden modes & further overkill-compiling.

I'll post a schematic in a few days, hope that will further explain the stuff I mentioned above, easier to talk further with the schematic posted.

Bye,

  Peter

 
Well, I'd say *1* it is, then.

My theory is not so firm on M/S yet but basically flip one, sum that
and then the mix decides...stereo width?

Umm, yeah here we go:

Talking about a board that can do the whole rubbel in one abwasch,
how bout this:

It's got Debal/Bal components you can but don't have to stuff.
It's got relays to switch and flip the sig path right there on the board.

And the VCA thing still isn't letting me go, but the main reason is not
really that "pots sound bad" - That orche production sounded great,
and they don't even know what a 2€50 Radiohm is ;) BUT...

Depending on where you put the board, you'll have these long pot conn
lines going through box and past stuff and there EMI.

Come to think of it (and keef's uber-vixen ssl too), what about a now-we're
really-fucking-nuts fully balanced VCA version with 8 THATs on and balanced
through from input to output, with a selectable option for adding yet another
pot to run 2x lines unbal if you wish, and convert to a 2x1 bal or 4x2 unbal
vca summer with the addition of pots...and still stay audiofool?

Fetch he the straitjacket  :D
 
livingnote said:
Guess what just got etched?

Aha !  :)

This guy perhaps ?    :D

Oberheim.jpg


Nice !

Thanks,

  Peter
 
livingnote said:
Oberheim.jpg


Yup, this guy  ;)


DROOOOOOOLLLLLL !!!!
And that '2' looks tasty as well !

Cheers-a-lot !

  Peter


BTW
I haven't forgotten about the suggested Flip-n-Morph-schematic, want to Draw-n-Post that this weekend  ;)
 
clintrubber said:
I haven't forgotten about the suggested Flip-n-Morph-schematic, want to Draw-n-Post that this weekend  ;)

Hi Lukas,

I've just sent you a rough drawing. I'll post an updated here later.

Bye,

  Peter
 
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