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 Forum index » DIY Hardware and Software
5-channel Attenuverting AC/DC Mixer PROFESSIONAL PCBs
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Nov 09, 2007 11:10 am    Post subject: 5-channel Attenuverting AC/DC Mixer PROFESSIONAL PCBs
Subject description: interest in a 2nd run?
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up and running!

this is an attenuverting mixer. one attenuverter for each input. all attenuverted signals where summed, as long as the appropriate single output is not used (switching jack sockets). the summed signal is switchable from AC to DC. in AC mode the summed signal goes goes thru a cap. in DC mode the the cap is bypassed and the signal is also routed to a LED driver indicating the positive or negative parts of the signal.

since there is enough interest i do a run of professional manufactured PCBs, providing MTA connectors for all controls. this is an easy to build project, no obsolete, expensive or hard to find parts.
the boards should be available on 10 DEC 07. i will populate and test at least one PCB before taking money, paypal preferred.

pricing (preleminary):

europe
9.-EUR each PCB
+1x p&p 3.-EUR (2.50EUR germany)


worldwide
13.-USD each PCB
+1x p&p 7.-USD


so here is the documentation (EDIT: draft v2):
draft v2


PCB preview:
Posted Image, might have been reduced in size. Click Image to view fullscreen..

PROTOTYPE v1
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PROTOTYPE v1
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PROTOTYPE v1
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Last edited by fonik on Sat Jul 12, 2008 5:38 am; edited 21 times in total
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Scott Stites
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PostPosted: Fri Nov 09, 2007 11:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Very sweet and I'd wager will turn out to be one of your most used modules!
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Etaoin



Joined: Jun 30, 2005
Posts: 760
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PostPosted: Fri Nov 09, 2007 11:24 am    Post subject: Reply with quote  Mark this post and the followings unread

For a moment I thought I had found a use for my center tapped pots, but it appears not...

But I need at least two of these anyway I fear Very Happy

By the way, is that still unprotected copper?

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Peake



Joined: Jun 29, 2007
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PostPosted: Fri Nov 09, 2007 11:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Congratulations!

If you make PCBs for the public (hint hint! Very Happy ) I'd have an immediate use for two of them. Maybe more.
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prophei



Joined: Jan 27, 2007
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PostPosted: Fri Nov 09, 2007 12:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Peake wrote:
Congratulations!

If you make PCBs for the public (hint hint! Very Happy ) I'd have an immediate use for two of them. Maybe more.



another great module! i would put myself in the same place as mr. peake here... at least 2 of them!
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slo



Joined: Feb 18, 2007
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PostPosted: Fri Nov 09, 2007 6:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Lovely module, well done, I like the LED's touch, you cannot have enough blinky lights in my opinion.
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Rykhaard



Joined: Sep 02, 2007
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PostPosted: Sat Nov 10, 2007 8:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Etaoin wrote:
For a moment I thought I had found a use for my center tapped pots, but it appears not...

But I need at least two of these anyway I fear Very Happy

By the way, is that still unprotected copper?


Unprotected copper?? Wink Does that mean that I SHOULD be spraying each of my self-made PCBs with the conformal coating silicon spray that I bought, 2 years ago - and haven't gotten around to using yet? Very Happy

(Serious question. Just looking for input. Smile )
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Rykhaard



Joined: Sep 02, 2007
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PostPosted: Sat Nov 10, 2007 8:16 am    Post subject: Reply with quote  Mark this post and the followings unread

slo wrote:
Lovely module, well done, I like the LED's touch, you cannot have enough blinky lights in my opinion.


Heh. Check out the videos of my modular in the Design section of my webpage: http://deathlehem.com/wsb4569662402/design.html

Lots and lots of blinky lights. Very Happy (Will be many more coming, in my MFOS Sequencer and Klee sequencer. Very Happy )
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fonik



Joined: Jun 07, 2006
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PostPosted: Sat Nov 10, 2007 8:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Rykhaard wrote:
Etaoin wrote:
...By the way, is that still unprotected copper?


Unprotected copper?? Wink Does that mean that I SHOULD be spraying each of my self-made PCBs with the conformal coating silicon spray that I bought, 2 years ago - and haven't gotten around to using yet? Very Happy


protect from what? it is soldered so i would not care about stain...

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Rykhaard



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PostPosted: Sat Nov 10, 2007 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:

protect from what? it is soldered so i would not care about stain...


That's part of my curiosity. I do have 1 PCB prototype for a multiple-vowel filter that I'd done in '95 or so. The copper has held out fine. Barely tarnished.

Curious as well as - I've done 1 panel, using 1 of the many 15"x9" single sided copper boards that I have - for mounting controls to. I'm seriously considering using another to mount the controls for my MFOS Sequencer to. Gives a nice look. Smile Wondering there - if I should coat it with my sili. spray. There though - I don't know if the spray has any flexibility - which the panel itself would have happening - when switches are used; plugs pushed in / pulled out. Hmmmmm ..... ???
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Etaoin



Joined: Jun 30, 2005
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PostPosted: Sat Nov 10, 2007 9:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
protect from what? it is soldered so i would not care about stain...


Protect from the environment. I just repaired a Korg M500. The component side of that PCB is also not protected and it had many tracks turned green and eaten away by corrosion.

It would depend on your environment though. This Korg was probably stored in the wrong place.

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softfin



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PostPosted: Sat Nov 10, 2007 10:53 am    Post subject: Reply with quote  Mark this post and the followings unread

I bought some protective laqcuer and have recently sprayed my pcbs with it.
Smells terrible, so if anyone decides to use such spray, it's definately better to spray it anywhere else but not inside your house.
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Etaoin



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PostPosted: Sat Nov 10, 2007 11:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, I use a PCB coating from Kontakt that smells like paint (and not the water based ones) only more intensly so. I can hardly use that indoors either.
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Pehr



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PostPosted: Sat Nov 10, 2007 11:50 am    Post subject: Reply with quote  Mark this post and the followings unread

I don't think I've actually got what an attenuverter is... Embarassed

Is it an attenuator followed by an inverting op amp? Confused

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Danno Gee Ray



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PostPosted: Sat Nov 10, 2007 11:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Is there a schematic for this unit available? I'm curious as well.

EDIT...Duh Just re-read the top post and saw that it says "Schematic will be uploaded soon".
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fonik



Joined: Jun 07, 2006
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PostPosted: Sat Nov 10, 2007 3:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Pehr wrote:
I don't think I've actually got what an attenuverter is... Embarassed

Is it an attenuator followed by an inverting op amp? Confused

he he. an attenuverter gives both: attenuation of the original and the inverted signal. say pot in middle position: no signal, pot clockwise: original signal, pot counterclockwise: inverted signal. in other words: each channel allows you to invert and/or attenuate the signal...

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fluxmonkey



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PostPosted: Sat Nov 10, 2007 4:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Danno Gee Ray wrote:
Is there a schematic for this unit available? I'm curious as well.

EDIT...Duh Just re-read the top post and saw that it says "Schematic will be uploaded soon".


ken stone shows one way of doing something similar on his DC Mixer page... the additional pots in red... but i really like your inclusion of individual outs, fonik.

actually, you could implement this using a pair of ken's Dev-mod Mixer/Inverter blocks... i keep on thinking of uses for those, gotta pick some up next order.

yet another addition to the "to do" list (happy sigh).

b
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Pehr



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PostPosted: Sun Nov 11, 2007 5:05 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
pot in middle position: no signal, pot clockwise: original signal, pot counterclockwise: inverted signal.


Nice! Cool

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Sound



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PostPosted: Sun Nov 11, 2007 7:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Congratulations fonik,

Four for me Very Happy

Is difficult to add an "all input" for multiplying signals?
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fonik



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PostPosted: Sun Nov 11, 2007 8:31 am    Post subject: Reply with quote  Mark this post and the followings unread

bbob wrote:
Danno Gee Ray wrote:
Is there a schematic for this unit available? I'm curious as well.

EDIT...Duh Just re-read the top post and saw that it says "Schematic will be uploaded soon".


ken stone shows one way of doing something similar on his DC Mixer page... the additional pots in red... but i really like your inclusion of individual outs, fonik.

ken stones circuit (red components) allows no attenuation: you just fade the signal from pos to neg (or inverted). my module gives both, attenuation and, if desired, invertion.

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fonik



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PostPosted: Sun Nov 11, 2007 8:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Sound wrote:
Is difficult to add an "all input" for multiplying signals?

certainly not! that would be just a multiplier: add a socket and wire it to all individual inputs (you may want to use switching sockets here as well).

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frijitz



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PostPosted: Sun Nov 11, 2007 10:07 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:

ken stones circuit (red components) allows no attenuation: you just fade the signal from pos to neg (or inverted). my module gives both, attenuation and, if desired, invertion.

Not following what you are saying. In Ken's unit, the signal is zero when the pot is centered. So it looks to me like it both attenuates and inverts.

Very Happy

Ian
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fonik



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PostPosted: Sun Nov 11, 2007 10:43 am    Post subject: Reply with quote  Mark this post and the followings unread

frijitz wrote:
fonik wrote:

ken stones circuit (red components) allows no attenuation: you just fade the signal from pos to neg (or inverted). my module gives both, attenuation and, if desired, invertion.

Not following what you are saying. In Ken's unit, the signal is zero when the pot is centered. So it looks to me like it both attenuates and inverts.

Very Happy

Ian

Embarassed thank you, ian. so the signal actually cancels itself out? is that correct?

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PostPosted: Sun Nov 11, 2007 1:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
so the signal actually cancels itself out? is that correct?

Right. With the pot centered equal signals are sent to "B" and "C", one of which inverts, so the two branches cancel.
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Scott Stites
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PostPosted: Sun Nov 11, 2007 5:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

A spiffy variation would be to normal +5V (or more) through a 1K resistor to one of the input jacks. That gives you the ability to offset the mix +/-5 Volts (or more) when mixing CVs without plugging a DC voltage in. Of course, plugging something into that input would disable the DC function and handle the signal as usual.

For example, that would be handy for inverting an EG applied to one input, and offsetting it + with the normalled control, or putting a DC offset to a bipolar LFO for trill fx on a VCO.

Banana jackers (or non-bananjackers) could switch the offset in with a switch.

Ciaorioios,
Scott

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