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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: 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:
.
PROTOTYPE v1
PROTOTYPE v1
PROTOTYPE v1
Last edited by fonik on Sat Jul 12, 2008 5:38 am; edited 21 times in total |
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Scott Stites
Janitor
Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Fri Nov 09, 2007 11:16 am Post subject:
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Very sweet and I'd wager will turn out to be one of your most used modules! _________________ My Site |
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etaoin
Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
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Posted: Fri Nov 09, 2007 11:24 am Post subject:
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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
By the way, is that still unprotected copper? _________________ http://www.casia.org/modular/ |
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
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Posted: Fri Nov 09, 2007 11:39 am Post subject:
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Congratulations!
If you make PCBs for the public (hint hint! ) I'd have an immediate use for two of them. Maybe more. |
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prophei
Joined: Jan 27, 2007 Posts: 234 Location: san francisco, ca
Audio files: 4
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Posted: Fri Nov 09, 2007 12:48 pm Post subject:
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Peake wrote: | Congratulations!
If you make PCBs for the public (hint hint! ) 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 Posts: 204 Location: Victoria, BC
Audio files: 1
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Posted: Fri Nov 09, 2007 6:30 pm Post subject:
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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 Posts: 1290 Location: Canada
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Posted: Sat Nov 10, 2007 8:13 am Post subject:
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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
By the way, is that still unprotected copper? |
Unprotected copper?? 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?
(Serious question. Just looking for input. ) |
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Rykhaard
Joined: Sep 02, 2007 Posts: 1290 Location: Canada
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Posted: Sat Nov 10, 2007 8:16 am Post subject:
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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. (Will be many more coming, in my MFOS Sequencer and Klee sequencer. ) |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Sat Nov 10, 2007 8:31 am Post subject:
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Rykhaard wrote: | Etaoin wrote: | ...By the way, is that still unprotected copper? |
Unprotected copper?? 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? |
protect from what? it is soldered so i would not care about stain... _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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Rykhaard
Joined: Sep 02, 2007 Posts: 1290 Location: Canada
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Posted: Sat Nov 10, 2007 9:30 am Post subject:
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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. 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 Posts: 761 Location: Utrecht, NL
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Posted: Sat Nov 10, 2007 9:52 am Post subject:
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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. _________________ http://www.casia.org/modular/ |
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softfin
Joined: Oct 11, 2006 Posts: 271 Location: Far in the north
Audio files: 1
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Posted: Sat Nov 10, 2007 10:53 am Post subject:
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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
Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
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Posted: Sat Nov 10, 2007 11:17 am Post subject:
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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. _________________ http://www.casia.org/modular/ |
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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Danno Gee Ray
Joined: Sep 25, 2005 Posts: 1351 Location: Telford, PA USA
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Posted: Sat Nov 10, 2007 11:57 am Post subject:
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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 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Sat Nov 10, 2007 3:16 pm Post subject:
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Pehr wrote: | I don't think I've actually got what an attenuverter is...
Is it an attenuator followed by an inverting op amp? |
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... _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Sat Nov 10, 2007 4:37 pm Post subject:
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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
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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Sound
Joined: Jun 06, 2006 Posts: 842
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Posted: Sun Nov 11, 2007 7:34 am Post subject:
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Congratulations fonik,
Four for me
Is difficult to add an "all input" for multiplying signals? |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Sun Nov 11, 2007 8:31 am Post subject:
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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. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Sun Nov 11, 2007 8:34 am Post subject:
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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). _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Nov 11, 2007 10:07 am Post subject:
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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.
Ian |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Sun Nov 11, 2007 10:43 am Post subject:
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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.
Ian |
thank you, ian. so the signal actually cancels itself out? is that correct? _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Nov 11, 2007 1:40 pm Post subject:
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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
Janitor
Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Sun Nov 11, 2007 5:53 pm Post subject:
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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 _________________ My Site |
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