Mobenthey/Ciat-Lonbarde (synthmall) thread

[Zedkah]

Dipping my toes into this world , thinking of building a gerassic organ paper circuit.

Was curious about something.
At first I thought the binary numbers created by the 3 buttons allow for 8 different notes and the circuit shows 8 pairs of tuners/ sound controls for 8 different notes. But then I realized that the binary options include 000 ( or none of the buttons being pressed). There are only seven combinations of button presses. So does this mean the organ is sounding all the time- or at least every time all the buttons are released a new note is triggered?

[Cementimental]

Do you have a copy of the full diagram and/or link to context? can’t find it on his site right now…

[barrford]

From memory, I think trimmer 0 is the “base note” - i.e. the frequency which all others are in relation too.
I always thought it’d be a fun thing to build this then drive it from an Arduino running a Turing Machine-esque sequencer, instead of the switches. Or for a real CL instrument, have a three rolls that can be patched instead of the switches.

[barnjazz]

another gerassic organ question: what would it take to add trigger inputs in addition to the buttons? i’m building the organ as part of a rollz-5 hybrid (along with with some of the conrad papers circuits) and i’m hoping to trigger it with AV-dog or one of the rollz circuits.

[barrford]

The Rollz circuits produce ~ -8.5v when they pulse. i.e. the voltage is negative. This may or may not trigger the Gerassic Organ inputs correctly.
What I would do is use a NPN transistor in a “transistor as a switch” circuit with the rollz feeding the base of the transistor, and the output at the emitter (connected to +ve voltage), via a resistor, and the collector connected to ground.
I’d breadboard it first though!
A google for “transistor as a switch” will show you the schematics.

[pmj]

Cheers Tim, it’s here under the Conrad Papers Section:

http://www.ciat-lonbarde.net/TIMARACURRICULUM/TIMARATERIALS/cirques/index.html

[Cementimental]

ah yeah,

any kind of single-connection geometric shape usually represents some kind of node/touch point/brass peg I think… (or banana jack socket even, don’t know if these particular circuits use them?)

the hexagon is connected to the ground pin on the big capacitor… i think the part you initially posted must be the power section since it’s got a giant cap and the 3-legged component indeed looks like a regulator. No real idea where the + and - power connections would be to this (or any other part of the circuit) tho… I had the idea that maybe the hex and spiral represent positive and negative power bus connections, but that doesn’t make a lot of sense either because there’d be no reason to have two of them on each of the three sections on the bottom right…

[barrford]

On the Deerhorn, those spirals are inductors, 1mH or 10mH (milli-Henries), I think.

[Cementimental]

where would the other ends of the inductors connect to in this case tho?

any photos of a built one of these out there at all?

[pmj]

Cheers Tim, must admit I don’t really get the signal flow in this one… As you said, I can’t really be sure how the power (if that’s what that section is - and it looks like it should be) is supposed to link everything together.

Looking at the CD4081 chip the power source should go to pins 7 & 14 which both have hex and cross nodes going to them and on the LM324 it’s + to pin 4 (cross node) and GND to pin 12 (hex node) so maybe the power section is a master ground hex and + node for the whole system?

Also… If that rectangle is something like a 7809 voltage regulator the pins from top to bottom are +Input, GND and Output which would seem to indicate the double stars and the diode are intended to receive +voltage of some sort (?)

I haven’t personally seen any photos of a built one either. It’s all pretty intriguing

[Rodrigo]

There’s so many of these “deep cut” paper circuits out there. It’s great to see that a lot of them are getting built and looked into further.

I don’t know if these are out there somewhere, but I got this sheet (as a physical copy) with one of the instruments (radio zither?) that I got ages ago.

I don’t really know what the circuits are, but might as well post them here.

[pmj]

Nice! The one top right has the same symbol on it as the Esoterica Chainlock, don’t know if it’s the same or some variant of that one?

The other seems to be related to the Spikering, going by the symbol.

[vicimity]

The 0-note occurs on release of any button / button combination. That release time is defined by the resistor marked ‘x’.

[mlogger]

I decided to sell my additional paper circuits PCB’s for anyone interested

https://llllllll.co/t/fs-ww-ciat-lonbarde-paper-circuits-pcbs/23342?u=mlogger

[pmj]

Some Old Mr Grassi testing…

[Album] Phil Julian

[yoyosandshoes]

Does anyone use the Cocoquantus stereo out for headphones and is it compatible with this use?

[corpusjonsey]

Sure. Give it a try.

[ceedotgeedot]

If there’s any Deerhorn Organ owners here, I could use a little advice:

When I received mine about a week ago, everything seemed to work absolutely fine for about two days. Then, after about five minutes of having it on, the left DH wouldn’t respond to motion. I might’ve been calibrating it incorrectly after the problem started but long story a little less long, I sent it back to Peter on his advice. I got it back today and it was again working splendidly for about twenty minutes- until the DH on the opposite side got the same problem. Does it needed to be calibrated every single time? I had a PB2 previously, and didn’t have this issue.

[lijnenspel]

No issues here. Perhaps you’re having interference issues from other sources/machines? Did you try moving it elsewhere?

[ceedotgeedot]

Thanks @lijnenspel. I just tried moving out to my porch (no outlets or even lights) with a battery in the DH to no avail.

I emailed Peter yesterday, so hopefully we can figure it out.