#737

The board I have doesn’t have that resistor ladder/stylophone part. Here is the one I have. The part that’s confusing me is ‘10k ladder’, and ‘swiper’. Could be a piezo, but if I presumably solder that to x/-, the swiper pin is still missing a connection.

See the top right of the board for the 10k ladder. On the paper circuit it looks like the top rightmost pot.

#738

Also, has anyone built the MengQi DDDM2? I’m struggling to decipher the board, specifically the unmarked caps and different between Touch/Patch Points/To Patch Points. I’ve had a look at the Madame Brasser and Brando paper circuits and having trouble working it out from those.

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#739

Hi, Phil –

I was asking about this PCB last year (for some reason, in the middle of the Shbobo Shnth thread). This is the answer I received from Rodrigo: Shbobo Shnth patches and appreciation
(Scroll back for the context…)

#740

Thanks for this! What did you put together for yours in the end? I presume I could use something like this resistor ladder and wire some low rent touch pads to each pin…?

#741

finally got around to reading this essay (while closing tabs in my browser - only took me three months !)

is this Relabi then?

or I have I missed something?

3 Likes
#742

Yep, I would imagine so - I think a little counterpoint would bring the effect into focus though, as Berndt points out, it’s not arrhythmic or random, it’s ‘slipping’… which means that whatever you did there, the other materials in your music should slip similiarly somewhat, in a counter-relation, if you will, to your initial pulse!

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#743

I haven’t gotten to it yet. I bought several different PCBs at the same time and have been working on the easier ones first.

I’m still trying to think how to make the namastitar board work with my wire-strung harp. The harp has 22 strings, which actually consist of 11 wires. I’m wondering whether the 11 wires could be used as electrodes for a capacitive touch controller board, which could then control a digital pot, so that touching the harp strings would generate a range of resistance values analogous to the resistor ladders on the stylophone and fretted versions of the namastitar.

#745

then again, here’s PB calling this white noise ‘pattern’ Relabi, actually Quantum Relabi!

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#746

the main pattern (ie the overall set of pulses of white noise) sound like my thing. Presumably the white noise has detail too knowing PB :slight_smile:

I based my Reaktor thing off of a description by PB here http://petermopar.blogspot.com/2012/02/what-is-point.html and seeing what the Rollz does - https://i2.wp.com/pugix.com/synth/wp-content/uploads/2014/07/rollz-5-avdog.jpg (no offence to PB - love his work but he doesn’t do clarity - nice to see the circuit laid out in order to understand it)

I want to try modelling that circuit next (the bit at top left - the Rollz part) - that Reaktor thing feels way too over complicated and the controls are a bit mysterious too.

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#747

@junklight if you haven’t already check out Pugixs website as he has already done a lot of the circuit detangling work!

that is always a good exercise though practice never hurts haha

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#748

Getting some interesting speed changes and glitching using a cheap gamepad joystick clipped across nodes on a 4-Roll. I think this is a 10k (B103 marking) but not 100% sure.

The other good thing about these is there’s a simple built in switch for momentary push connections between nodes.

6 Likes
#749

Ooooh!

As someone who really loves gamepads and CL stuff this is super exciting!
Makes me want/wonder about a “fully analog” gamepad where each of the analog sticks and buttons are just broken out as connection points, rather than going through a HID interface.

So you are just using two of the pins? (1/2 or 2/3)

#750

Yes, all that’s going on in the video is one Roll node is clipped to one of the center pins of the joystick with another node clipped to one of the joystick outer pins on the same side / pot. That’s it. You could test it by just using an ordinary potentiometer and using a center and outer pin of course. Joystick obviously gives you the ability to control two Rolls boards simultaneously.

The one I have is a 10k joystick and it’s quite touchy, you may want to try a different value or use it in conjunction with a Roll that has quite slow caps on it to give you a better min and max speed range.

I’ve just been going through my junk draw and have found that clipping different components (resistors, capacitors, pots etc) across the nodes all have some sort of effect on how the Rolls interact.

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#751

Interesting and exciting.

I would imagine the value of the pots would have a big impact on it.

I wonder what would be a reasonable value pot for something like this?
Does anyone know what the pots inside a Plumbutter are?

Perhaps @barrford might know from the modelling he did of the Roolz-Gewei/Labrolz? Or perhaps @Circitfied might have an idea as well?

I could totally see a little breakout box that lets you “play” the rollz with some controllers.

I had a quick google for a DIY controller but didn’t see anything. I guess it would be possible open/gut an older xbox controller or something like that, and just expose all the pins to a cable/breakout box.

#752

this would be very sick

#753

Sparkfun and other companies have variants on these Arduino breakout shield boards that I guess could be pressed into service (I’ve never used these but they seem to have a decent set of useful parts)

SC14754-501

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#754

Yes, though there are a lot of other variables with the speed of the caps you select and how much voltage you have left in the battery powering the Roll. I’m sure there’s a calculation you could do but that sort of thing is beyond me I’m afraid.

You do have some leeway to create weird joystick resistance values by applying extra resistors. If a joystick is just two potentiometers, in theory any of these series / parallel value change combos should work OK

https://www.allaboutcircuits.com/textbook/experiments/chpt-3/rheostat-range-limiting/

http://musicfromouterspace.com/analogsynth_new/HOT_TIPS/coarserangeadjust.html

#755

@Rodrigo I’m looking at this for a project, comes with a handy little PCB: https://www.adafruit.com/product/512

1 Like
#757

Does anyone have an updated BOM for the Meng Qi 2017 Rollz-5 PCB? Every BOM I can find has lots of discontinued parts (all of the BOMs on MW as well as the BOM from Modular Addict). Thanks!

#758

This is as close to one as I could find, someone was kind enough to send this to me. I think it’s pretty much all there. It was first time building something like this for me and I managed it so there’s hope for anyone! Soldering was the easy bit.

Meng qi rollz 5 (2017) - Blad1.pdf (42.1 KB)

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