#9

6mm D-shaft. pictured are selco, which we use on our modules. i’d be happy to throw those in. there aren’t a ton of options for 6mm D-shaft. most are 1/2" which do fit but are a little wonky-- some people don’t mind and do this with their eurorack re-knob jobs. e-mail info@monome.org for further talk about this!

#10

This is very interesting to me, because I’m very keen to develop a high precision controller - I hadn’t considered the knob radius aspect.

#11

well, with a knob what you sense as “responsiveness” is how far you move the knob until a data “tick” is measured. there’s a point where more resolution isn’t at all helpful-- you’ll run into mechanical limitations (force required to begin movement, or if you’re in the ball-bearing universe-- the tiniest force will register changes-- this happen often with the arc, so a lot of software filtering is in place to reduce the resolution, effectively.)

“sensitivity” could be measured as circumference divided by bits resolution. some fake numbers-- say my knob has an inch circumference, on a pot it’s using 300 out of 360 degrees, and were reading at 7 bit (128 steps). that’s 1 / (300/360) for the length = 0.83" and then divide that by 128 = .0065" per bit. that’s a pretty small distance.

to have this same sensitivity with a twice-as-large (in circumference) knob, you’d need another bit of resolution.

#12

Would actually be interested in buying the pots for this since you’ve sourced high quality ones but building in a custom format, what is the potential for that?

#13

i’d rather not get into the business of selling pots-- i have only a tiny handful for random projects, as we order according to our euro module BOM, and i don’t expect to be putting in a new order. but, there are easier ways to get these-- we simply needed to import a very specific pot. in general Alpha is very high quality. see here:

http://www.mouser.com/Alpha-Taiwan/Passive-Components/Potentiometers-Trimmers-Rheostats/_/N-9q0yi?P=1z13wbbZ1yzmno7

#14

what was this doing in the “bright light…” video? controlling mlrv?

Cut Glove (xbox controller-based live sampling patch) beta
#15

ha. mlrV channel levels. usually that’s all i need.

#16

not strange at all

all i usually reach to the mouse for is changing the levels & buffer speed

#17

i like this layout concept. can you elaborate on how it relates to aalto?

#18

say i had four instances of aalto, each arpeggiating

1: global parameter, to all instances
4: cutoff of bandpass filter, per instance
16: columns assigned to instances, so four per voice. timbre controls, similarly mapped per instance.

of course, this is freely assignable, just a standard midi cc.

1 Like
#19

Just asked Tehn permission to add: I had two of these made and I would like to trade the leftover boards from a batch for anything you might have. I don’t want to productise these and I would like to swap some excess boards I have had made for his four-n knob bank.

I don’t want money, I want projects! So PCBs, part finished kits that fell by your wayside, send me your unloved, your discarded, your misfits, send me your white elephants and boards you never got round to finishing, send me your Raspberry Pi and Arduino interface cards or eurorack bits and pieces, rails and such and you can have one. No money. I am not productising this, this is tehn’s harness and he has given me permission to swap some excess boards when these few left are gone its gone.

I have found RS Stock No.729-3426 pots I like best are these Metal Shafted Alpha Pots 10K Vertical 20mm to be perfect with a centre detent type which I like for sitting at 64cc, its nice to know when you reach halfway on a MIDI Sweep. They snap in and fit just right. The mounting pin holes are small.

Here is my pair… they make absolutely beautiful general purpose knobs in an arrangement I get on with… I have top plate designs in frontpaneldesign.

PM is best or email clive.grace@outlook.com

I have some spare Hat Knobs to trade if anyone is interested, not cheap but physicality is important.

four-n2.jpg960×1280 110 KB
Four-n1.jpg960×1280 149 KB

9 Likes
#20

just wanted to say that this looks absolutely beautiful!
don’t have anything to offer, otherwise i’d be all over this.

#21

Agreed. If this was a product for a sensible price, I’d buy it.

From my experience with the illucia dtr, which also uses alpha pots, I don’t think 1024 would be a problem.

#22

thank you. Brian & Kelli really raised the game when they applied their aesthetic to their products and when DIYing I have always tried (not always gotten there) to approach their simplicity and ease of multiple use. A good knob bank is an audio swiss army knife for me…

Video soon. I have set myself learning Supercollider and Aleph by November.

1 Like
#23

weeeeeeeeeee! :smile:

#24

these guys look good?

http://ie.rs-online.com/web/p/potentiometers/7293583/

regular ol alps pot. presume the ohm rating doesn’t matter for this application?

#25

Went with these in the end: http://ie.rs-online.com/web/p/potentiometers/7293423/

the snap in footprint kind of limits the choice of pot for this board.

very tempted to lay out a similar knob box pcb myself! would be a great little project to get to know eagle as tehn mentions…

#26

The snap in holes limit the type deliberately so that the really comfy knob types fit this. The feel of the pots in mine are a lot better than most commercial knob banks. There are quite a few sketches that work with this that are out on the Internet, just search teensy and knob controller and you will find them. The teensy has class compliance and midi built in which makes custom sketches easy, if anyone has any they would like to share that would be great.

I still have a couple if boards left it anyone has any pcbs that want to trade…

This is a good place to start and to understand teensy usb midi, note that tehn’s design has a small poke hole for the reset button. I attack the board sideways in the gap between board and top plate.

#27

Cool, thanks again Clive. Have just been reading up about teensy and midi - it really couldn’t be easier to set up the teensy.

#28

i’ve got a strange short somewhere on on the board i think. i’ve been over it a number of times and can’t seem to find the issue.

i notice on the teensy 3.1 pin out card that there is an instruction to:

“Cut to seperate VIN from VUSB, if using a battery charger or external power for USB device mode” presume this doesn’t apply here?

it’s weird - i can get the board to function only when setting a single pin as my CC output. adding 2 or more pins causes the midi stream to get stuck in a loop.

any ideas? try harder yeah :confused: