Faderbank Run: See top post for status

Oneven · 2018-04-17T14:22:31.597Z

Jumping on the interest train

courdek · 2018-04-17T16:50:15.373Z

Registering my interest in a pre-built or kit for sure. Recently learned it does simultaneous i2c, cv and midi outs per fader

facetimecontinuum · 2018-04-17T17:08:42.914Z

I am also interested in a pre-built unit

Smoth · 2018-04-17T20:40:49.424Z

I’d get down with a prebuilt unit!

_taphead · 2018-04-19T22:53:27.226Z

I am very interested in a pre-built unit, these look amazingly useful!

MATA · 2018-04-26T19:29:17.808Z

Súper project! I’m very interested.

dudadius · 2018-04-29T21:36:20.586Z

I am jonesing for one of these…

shellfritsch · 2018-04-29T22:04:58.687Z

still trying to lock down quotes on panels… once i have that i can share more details about timeline & price

fever606 · 2018-04-29T22:08:36.858Z

Colour me hyped… the Instagram videos I have seen from the involved parties have sent my head spinning with possibilities…

karst · 2018-04-29T22:27:13.826Z

still interested in a built model, assuming that the DIY version proves too complicated as a first project

seems like this could be a killer norns controller too

spacetime · 2018-04-29T22:32:29.179Z

very interested. built or DIY, whichever is available first

bobbcorr · 2018-04-29T22:59:22.675Z

Now I’m wondering if you could plug one of these into Norns …

shellfritsch · 2018-04-29T23:01:14.974Z

20 characters of yup!

Leverkusen · 2018-05-07T04:43:03.646Z

After learning that the Grid can actually damage Teletype with its power draw I wonder if it is safe to plug the faderbank into norns.

Would it be okay regarding USB power/current if all 16 faders output 5 V to the modular while it takes the power from norns?

infovore · 2018-05-10T21:31:47.614Z

Leverkusen:

After learning that the Grid can actually damage Teletype with its power draw I wonder if it is safe to plug the faderbank into norns.

Where did you see that, out of interest? Understanding why that would happen will help me answer you correctly.

Leverkusen:

Would it be okay regarding USB power/current if all 16 faders output 5 V to the modular while it takes the power from norns?

So, thinking aloud:

the 5V that powers the CV outs comes straight from the raw usb 5V input, before any filtering, ie, straight from the source (in your example, Norns)
it’s buffered by an MCP6004 opamp, on +5V/0V rails
if there’s an issue, it’s going to come down to what you plug the faderbank CV out into - I believe. That’s where the draw upon the faderbank will come from, which will in turn draw on the 5V output elsewhere. I’d imagine this isn’t an issue, owing to input impedance resistors and so forth, but cannot guarantee anything in the magic land of analog
I should add: there are 1k impedance resistors on the CV outs at 16n end.

infovore · 2018-05-10T21:33:16.030Z

quick update: there will be a quick update at some point.

What I mean is: I am on vacation, and @shellfritsch has also been travelling - we even managed to cross paths in the UK. we have, however, still been moving a few things forward - got some new prototype boards into the world and into Europe and America - and making progress on BOM and panels. Proper update when I’m back home.

scanner_darkly · 2018-05-10T21:42:53.018Z

infovore:

Where did you see that, out of interest?

Grid ops / integration Development

My teletype just instantly died (stopped powering up, no leds light up screen all black) after i attempted to plug the grid to it (not powered externally) to test a scene i was working on. I’m aware that i should power the grid externally (had already ordered the cables to do so) but i had no idea i could fry the teletype by trying this Is there anything i can do? Thanks.

xeric · 2018-05-10T21:59:03.840Z

Coming into this thread pretty late, and I know these aren’t quite ready yet, but is the plan right now to have individual CV outs per slider? If so that sounds amazing, and I would definitely buy a prebuilt one!

michael_matos · 2018-05-11T03:15:21.464Z

Yes. The current build has individual cv outs. It’s magical.

Leverkusen · 2018-05-11T05:04:58.855Z

infovore:

the 5V that powers the CV outs comes straight from the raw usb 5V input, before any filtering, ie, straight from the source (in your example, Norns)
it’s buffered by an MCP6004 opamp, on +5V/0V rails
if there’s an issue, it’s going to come down to what you plug the faderbank CV out into - I believe. That’s where the draw upon the faderbank will come from, which will in turn draw on the 5V output elsewhere. I’d imagine this isn’t an issue, owing to input impedance resistors and so forth, but cannot guarantee anything in the magic land of analog
I should add: there are 1k impedance resistors on the CV outs at 16n end.

Thanks to @scanner_darkly for pointing to the source thread for the teletype/grid information - I should have thought about quoting it here. Also it might be a question to be asked in the norns thread regarding the available USB power. I just have no idea how much current a eurorack module might be drawing into its CV inputs and how it sums up at the USB.

Also what comes to my mind is that there was an issue with Mangroves damaging an intellijel module because the run input was directly connected to the raw 12V power rail, I think.

To be honest I have no idea what the opamp buffering or an output capacitor do or if they already address these questions.