5-channel Attenuverting AC/DC Mixer PROFESSIONAL PCBs

fonik · Posted: Sun Nov 11, 2007 11:38 pm Post subject:

@bbob
sorry bbob, i'd thought i knw something, in fact it once more turned out that i almost nothing.

@scott
Very Happy

great idea, i will implement this. more functionality without more controls...

fonik · Posted: Wed Nov 14, 2007 5:31 am Post subject:

if there is any interest i could do a run of professional manufactured PCBs. this is an easy to build project, no obsolete, expensive or hard to find parts.
the board would be about 10.-EUR/14.50USD, providing MTA connectors for all controls. minimum would be 40 advance orders.

so here are the schematics:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

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

RF · Posted: Wed Nov 14, 2007 6:25 am Post subject:

Hi fonik -
Sure, I'd go for for a pair of those...
Thanks

EdisonRex · Posted: Wed Nov 14, 2007 7:22 am Post subject:

I'd go for 2. They look pretty simple too.

slo · Posted: Wed Nov 14, 2007 7:45 am Post subject:

I'd go for 1

George

amos_joseph · Joined: May 09, 2005 Posts: 50 Location: Lincoln, NE

I'd take two.

softfin · Posted: Wed Nov 14, 2007 8:26 am Post subject:

I have to say you've handled all your PCB projects in a such a positively exceptional way that it would be simply a pleasure to buy some boards from you once again.
So, two boards for me, please.

goodrevdoc · Posted: Wed Nov 14, 2007 10:32 am Post subject:

I'd be down for two.
-justin

b-funk · Joined: Jul 17, 2007 Posts: 193 Location: Berlin

für mich bitte auch 2...

damn, where does all the money go? Rolling Eyes

bubblechamber · Posted: Thu Nov 15, 2007 4:03 pm Post subject:

i'll take 4

fluxmonkey · Joined: Jun 24, 2005 Posts: 708 Location: cleve

2 for me, please.

insider · Joined: Aug 01, 2007 Posts: 14 Location: france

Me too, 2
thanks Fonik

bugbrand · Posted: Fri Nov 16, 2007 3:33 am Post subject:

Such modules are really damn useful! Very good that you're offering PCBs, Mathias. However, I recently DIYed my own slightly different versions (-- two twin attenuvert mixers) so I'm afraid this'll be the first Fonitronik PCB I don't partake in!

I recommend at least two for everyone else!

fonik · Posted: Fri Nov 16, 2007 4:01 am Post subject:

thanks tom,

the response was rather faint until now, though. i expected this somehow: this is not a sexy module at the first glance, no imposing sound manipulation or something like this. Wink

but it is a very very useful voltage processor nevertheless. each mixer, voltage processor, or multiple expands the possibilities of your synth, and this one is easy to build, straight forward...

norman phay · Posted: Fri Nov 16, 2007 5:13 am Post subject:

Put me down for a couple of these, please. That looks damn handy.

RF · Posted: Fri Nov 16, 2007 6:26 am Post subject:

mono-poly · Posted: Fri Nov 16, 2007 8:20 am Post subject:

Need four!

Fidgit · Joined: Jul 13, 2006 Posts: 42 Location: CH

4 please

tnx

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

2 to me ,

Thanks fonik!

sonicwarrior · Joined: Dec 22, 2005 Posts: 266 Location: Cologne, Germany

I don't really get it:

Is this for CV-only or will it work with Audio signals? Confused

fonik · Posted: Fri Nov 16, 2007 4:59 pm Post subject:

sonicwarrior · Joined: Dec 22, 2005 Posts: 266 Location: Cologne, Germany

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Hello, sorry the off topic but I'm wondering...

I've noticed that there are some modules that allow AC /DC in the same input, and there are others ,like this one, that have a switch and carry the AC through a capacitor.

why? What is the difference within them?

Thanks!

fonik · Posted: Sat Nov 17, 2007 7:51 am Post subject:

i am not quite sure if i understood your question correct.

we handle audio signals as AC. we want to pass them to the next module AC coupled (or capacitance coupled), the DC offset is removed by using the cap. offset in audio could cause popps and plops.

we handle control voltages as DC. here we don't want to get rid of the offset, we want to use it, therefor the cap is bypassed.

http://zone.ni.com/devzone/cda/ph/p/id/9

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Thanks, Good link. It has helped me very much.

But , eg. the PlanB's model9 allows both AC and DC, without any switch.

Could it block in another way the possible DC portion of an audio input?