#41

thanks! it’s mp2 on the grid, sequencing an arp 2600 soft-synth. the faderbank is mapped to various parameters (waveform levels, envelope, filter, octave, delay, chorus).

i have to admit it’s been a while since i’ve played around 100% in the box. kinda nice to get a break from the rat’s nest of wires :wink:

8 Likes
#42

If you’re looking for motorized faders, I’d recommend figuring out how to get one of the Behringer X-Touch controllers to bend to your will. If none of their layouts work for you, it’ll still probably be cheaper to buy one and cannibalize the parts than to pay 35€ per fader

3 Likes
#43

What a cool project! I want to try building this soon.

they are a bit small. however, i do like the extra bit of grab they provide.

update: one of the caps split this morning. prob not a great long-term solution…

Those caps are commonly used on Alps slider pots by Buchla clone builders (of which I’m one). They fit, but they’re less likely to split if you heat them up a bit before sliding them on. Some people have sourced similarly-colored caps that are completely smooth and don’t have the ridge in the middle, but I think those are either NOS or custom-made.

#45

The software engineer in me couldn’t help but notice this code could be tightend up:

const int ports[] = {A0,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,A11,A12,A13,A14,A15,A16};
int v[16];
int next;

void setup() {
}

void loop() {
  for(int i=0;i<16;i++) {
    next = (analogRead(ports[i]) / 4 + v[i]) / 2;
    if(v[i] != next)
      usbMIDI.sendControlChange(i, next / 2, 1);
      v[i] = next;
  }
  delay(4);
}
3 Likes
#46

…just spotted this handy-work by @bpcmusic

5 Likes
#47

I was holding off posting here until I had something working to show off; I broke silence on Instagram because I was damn excited that my first custom part in Eagle actually worked (the Switchcraft stereo jack in the photo).

I’m experimenting with a host i2c circuit coming off the 16n (same wiring as in the Aleph for its i2c master) to drive 4 of my Teletype output expanders - providing CV and movement triggers for each fader. A bit of overkill in the circuitry department - but that can be considered in the future depending on how well things work with this incarnation.

I’ve also added in a few capacitors here and there for fun.

Also, modded the illustrator file and had a bamboo top and bottom cut at Ponoko:

Sealing it with a few coats of Tung Oil:

No promises for anything at this point; just some R&D doodling as I wait for board turns and parts for the Telex expanders.

Cheers!

b

18 Likes
#48

You never stop ! Makes the expander even more exciting !

2 Likes
#49

ah, the magic moment of your first EAGLE part working out :wink:

1 Like
#50

So has anyone found a resonable cost fader solution? $50 a pop ALPS aint gonna happen :slight_smile:

#51

http://au.mouser.com/ProductDetail/Alpha-Taiwan/RA2045F-20R-15LC-B50K-C/?qs=%2Fha2pyFadugyeaqSo53ldk1Ymgn%2F7D177P134LBmF2XCYUwQOSMYUA%3D%3D

have no idea but would these suffice?

#52

Looking great! – Regarding ponoko, how have you found the accuracy? In my experience things were off by at least 0.5mm and not in a predictable way, sort of a wonky random shift of 0.5mm in any direction. For my purpose it was enough to make the parts unusable, but they were very intricate and small.

It looks like you can sand out the difference if it gets in the way though. Love that bamboo!!!

1 Like
#53

I’ll know about the fitment with Ponoko when I align it with the boards (didn’t have them when I started oiling the wood - needs to dry a bit more). Will report back.

I did some panels with them a while back using their chemical etching process - took forever, needed lots of cleanup and I don’t like the look of the etching. Won’t be doing that again.

Lasercutting was fast. Holes were a little small for the standoff screws, but I enlarged them a bit with the drill and should be good (left them a little tight on purpose). Bamboo was a little fragile on the edges and, being a grass, is prone to throwing off little threads when you work with it. The material is very-thin as well. The acrid, burnt wood smell needed several days to gas off - but that is an issue inherent with lasercutting in general.

This most likely won’t be the last panel for the thing, but it does look really beautiful soaking up the oil. I’ve some crowd-funded impulse purchases coming in the mail over the next few months that may have me experimenting with more materials.

b

1 Like
#54

highly highly recommend pololu for laser. we do tons of prototyping with them.

https://www.pololu.com/

they also make the only good avr8 programmer: https://www.pololu.com/product/1300

2 Likes
#55

the ones i’m using cost $3/ea.

looks like mouser is low on stock, but more are scheduled to come in tomorrow. (btw their reference picture is wrong!)
http://www.mouser.com/ProductDetail/ALPS/RS6011SP6003/?qs=3cOf6TWd2rbyy41GF81woQ%3D%3D

1 Like
#56

Cool, thanks for the info! – you have quite some cool projects going on. :smiley:

1 Like
#57

This is far to promising to let go!
Even if it’s midi just go the simplest midi/converter route…

Would anyone mind if I posted this to pusherman? With numbers come discounts:)

If not I’d be keen to pony up with anyone on here - I’m imagining this with the arc and 128 and teletype and I’m freakin out

2 Likes
#58

Cool project. The end result looks really neat!

I especially like how it showcases how easy it is to get something working using platforms like Teensy and Arduino. It really takes away the technical difficulties of for instance USB to allow people to be creative.

You may be able to cut cost by not using a PCB and manually connecting the faders instead.
Similar to this box: http://www.mpc-forums.com/viewtopic.php?f=41&t=140209
To accommodate the cables, the enclosure would need to be a bit higher though. And it wouldn’t be as clean of course.

Coincidentally, I made a very similar controller but with some other design choices.
You can check it here (images) and here (source).
Not sure if it’s okay to post it here? Do I better post this in separate thread?

4 Likes
#59

Does anyone have an extra board for this laying around?

1 Like
#60

Wow, these are gorgeous!

The caps in the original post look like they fit better than the ones from Mammoth. Where are they from?

#61

I’d be interested for sure if 2 others wanna do an OSHpark run