Muff's Modules & More

J3RK · Posted: Wed Mar 21, 2012 12:01 pm Post subject:

Just about got it. w00t

Junk Rhythm · Posted: Wed Mar 21, 2012 12:05 pm Post subject:

Does the dual panel really need All IN? The jack space would be better suited towards a VC Input for the XFADE. The audio input could easily be normalled from the Audio Input 1 to Audio Input 2 or externally multed. It would be a shame to not have VC over the XFADE.

clarke68 · Posted: Wed Mar 21, 2012 12:31 pm Post subject:

J3RK · Posted: Wed Mar 21, 2012 12:44 pm Post subject:

Sounds like an excellent idea to me!

I should have the board layout starting tonight after a couple more small schematic changes, so I'll get you the dimensions after that.

Monobass · Posted: Wed Mar 21, 2012 1:29 pm Post subject:

asterisk · Posted: Thu Mar 22, 2012 12:16 am Post subject:

yeah what george said!
normal the input jacks if it doesnt seem too hard to do!

Junk Rhythm · Posted: Thu Mar 22, 2012 12:34 am Post subject:

I'm in for two dual panels.

clarke68 · Posted: Thu Mar 22, 2012 11:53 am Post subject:

I updated the artwork in the first post to reflect George's suggestion...looks good, I think that will make for a flexible & tidy module.

Also...I got quotes back, and there's good news all around:

1.) We have enough interest to run both panels SlayerBadger!

2.) The price on the Dual came in a little lower than I expected nanners

I'm in the middle of shipping madness with my other panels, so I wasn't going to start taking orders on these until next week. Question for you guys: would you rather start placing orders ASAP (that would be Monday) or would you rather wait until J3RK has the x-fader PCB all settled?

Another question: I'd prefer to not call these modules "291" since that's already the name of a commercial product. Easy to deal with on the Dual which has plenty of room, but "291" is about all that fits on the Single. Best short name I've come up with so far is the "VCBF" but there's got to be something better...anyone have an idea for a name that will fit in nice large letters on the Single?

bsmith · Posted: Thu Mar 22, 2012 12:00 pm Post subject:

Upping to 2 dual please.

w00t

Edit: D'oh, sorry looks like I'd posted on the first page!

Monobass · Posted: Thu Mar 22, 2012 3:41 pm Post subject:

Mmm a pair of duals with crossfaders and some quadrature modulation will make an awesome stereo morphing filter!

asterisk · Posted: Thu Mar 22, 2012 8:30 pm Post subject:

stupid question:
is the mix output just the mix of the 2 bandpass outs?
and the crossfader will only work between bandpass outs right?

im guessing that the high and low pass are nice add ons for this module.
the real magic is with the bandpass on this one.

clarke68 · Posted: Thu Mar 22, 2012 11:52 pm Post subject:

Junk Rhythm · Posted: Thu Mar 22, 2012 11:58 pm Post subject:

rico loverde · Posted: Fri Mar 23, 2012 12:11 am Post subject:

Just a thought, and its not a big deal but thought id mention it. Since the dual panel is basically mirror images what do you think about swapping the Lowpass and highpass jacks on one side. Basically so the are mirrored like everything else. Obviously my ocd is kicking in again w00t

Junk Rhythm · Posted: Fri Mar 23, 2012 12:28 am Post subject:

clarke68 · Posted: Fri Mar 23, 2012 2:29 am Post subject:

Monobass · Posted: Fri Mar 23, 2012 2:37 am Post subject:

I vote for random

Monobass · Posted: Fri Mar 23, 2012 2:41 am Post subject:

switch to choose which output goes to the crossfade? hihi

J3RK · Posted: Fri Mar 23, 2012 5:58 pm Post subject:

Ordering protos of the fader board by the end of the weekend. It's now in its final state design-wise. I'm just optimizing traces now. The board turned out to be 3"x3" so slightly smaller than the 291 board. I had hoped for half the size, but with the extra components I needed to add for the low distortion config, it grew a bit. I think it's well worth it though. It's very low noise/distortion and very accurate now. It can easily mix waveforms accurately, so if you use it with a VCO, you can crossfade any two waves quite nicely. It has lots of IO, and is fairly mult-purpose as well.

You can use it as a linear VCA, xfade, mixer, etc. etc.

Fade CV is -5 to +5 volts. I thought bipolar made the most sense for this. (LFO friendly, etc.) Unipolar signals will work fine to though by using the bias controls.

It has:
Fade Bias Pot
Fade CV Input
Input 1
Input 2
VCA 1 Offset Pot
VCA 2 Offset Pot
VCA 1 Individual Out
VCA 2 Individual Out
Mix Out
Inverted Mix Out

I'm pretty excited about this thing now. hyper

Everything on it is easy/cheap to get. There is one dual precision op amp for the CV section. LT1013/LT1112 are recommended for this, but you could potentially use a TL072. I personally would go with the LTs for this. I also used an OPA2604/2614 (I'll verify which is was when I get home,) for the final mixer stage. Once again, other things might work here just fine. Two LM13700 OTAs are used, but these are still made, and cheap to get. Everything else is VERY standard stuff.

w00t

synaptech · Posted: Fri Mar 23, 2012 7:59 pm Post subject:

Can't wait, awesome work J3RK! thumbs up