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Fernando Pablo Lopez-Lezcano 9c0222cc01 octathingy: close a bit the slots for the rubber bands, should also help with printing the shock mount inner ring		8 år sedan
attic	0dfe14d5cd move old calibration 3d model directory to attic (unused stuff)	10 år sedan
calibration	2b6253bfd0 sphear_plot_directions: remove old code, clean up, add support for Octathingy (but not yet for UV)	8 år sedan
doc	073157dec3 final TinySpHEAR 12 pin DIN connector wiring	9 år sedan
pcb	887d819a10 zapnspark: update board layout	8 år sedan
pictures	67b476c7a5 rotate pictures, adjust width of pictures in page	10 år sedan
.gitignore	ad103a6c45 ignore stl, gcode and backup files in local copy	9 år sedan
BigSpHEAR.scad	80c64a6157 add initial 12 capsule design to repository	11 år sedan
BigSpHEAR_20.scad	3f64d66464 the leg slots have now the correct depth, it does fix the big sphere build process, also separate more the individual pieces for the print otherwise some of the connecting legs get messed up	11 år sedan
CCRMA_logo.scad	357524d3bf fixed 2-manifold issue with logo by splitting one of the polygons	10 år sedan
Octathingy.scad	eefa3b97fa push the latest (very old) changes to the Octathingy design	10 år sedan
Octathingy_EM182.scad	dbbd6904fb add triangular legs as a default for EM182 and EM200 Octathingy	9 år sedan
Octathingy_EM200.scad	69673fa399 push the latest Octathingy_EM200, the code needs to be cleaned up and it is a mess but at least all elements are there	9 år sedan
Octathingy_common.scad	e476ba35bb octathingy: add proper angles and extra parameters for capsule mount legs	8 år sedan
Octathingy_mount_pcb.scad	9c0222cc01 octathingy: close a bit the slots for the rubber bands, should also help with printing the shock mount inner ring	8 år sedan
README.md	b5463e2760 added very brief descriptions of the PCB design and calibration software	10 år sedan
SpHEAR_common.scad	f87c86d4b8 add small ridge to capsule holders, make mount to stand right height (having problems printing the taller one), add experimental code for octathingy capsule connection legs when elevation of capsules is the right one	8 år sedan
SpHEAR_windscreen.scad	11da86eafc change size of lower windscreen ring to be bigger, otherwise there are problems with adhesion of the first layer of the print and most prints fail	8 år sedan
TestRig.scad	de02365217 add a parameter to the capsule module so that we can make the slot in the mount narrower for a tighter fit, test rig: first test prints of the parts, tweak tolerances so that all pieces fit together, I need to adjust the length of the stalk and the size of the adapter so that the stalk does not move and the skirt is longer so that it grabs better the mount cylinder - the concept works fine and the stop for 0 and 90 degrees works as intended	10 år sedan
TinySpHEAR_EM182.scad	9be86c043e remove TinySpHEAR code (four capsule microphone) for old shock mount (internal ring, external ring and connecting rods), add ridges and channels to guide rubber bands in internal ring, connect internal ring columns with walls so they cannot bend, add parameters for new shock mount, redo rendering code for the different parts, update EM182 and EM200 versions of the microphone to render the new shock mount	9 år sedan
TinySpHEAR_EM200.scad	9be86c043e remove TinySpHEAR code (four capsule microphone) for old shock mount (internal ring, external ring and connecting rods), add ridges and channels to guide rubber bands in internal ring, connect internal ring columns with walls so they cannot bend, add parameters for new shock mount, redo rendering code for the different parts, update EM182 and EM200 versions of the microphone to render the new shock mount	9 år sedan
TinySpHEAR_H2N_EM200.scad	e4f117f019 split H2N EM200 rendering to a separate file (like for other microphones), change rendering of the body of the H2N array so that we can mount a windscreen on it (leave old stuff as _no_ws modules for now), make the windscreen the same as for the SpHEAR EM200 standalone microphone	9 år sedan
TinySpHEAR_H2N_common.scad	4357306503 add upper flare and stalk to new H2N bridge code, add locking screw to one of the columns of the H2N base	9 år sedan
TinySpHEAR_common.scad	f87c86d4b8 add small ridge to capsule holders, make mount to stand right height (having problems printing the taller one), add experimental code for octathingy capsule connection legs when elevation of capsules is the right one	8 år sedan
TinySpHEAR_mount_pcb.scad	9be86c043e remove TinySpHEAR code (four capsule microphone) for old shock mount (internal ring, external ring and connecting rods), add ridges and channels to guide rubber bands in internal ring, connect internal ring columns with walls so they cannot bend, add parameters for new shock mount, redo rendering code for the different parts, update EM182 and EM200 versions of the microphone to render the new shock mount	9 år sedan
TinySphEAR.scad	3f6a270667 really push changes to TinySpHEAR_common.scad, TinySpHEAR_mount_pcb.scad and TinySphEAR.scad	10 år sedan
db25.scad	0867c40109 Octathingy: add new bottom flare to single DB25 connector, first try at new design for the shock mount	9 år sedan
threads.scad	362edf83c1 h2n: wind screen support with three rings, add code for splitting the microphone stalk and capsule array mount from the bridge so that the capsule array can be separated from the the recorder body without making the whole system too big - includes threads for 8 pin mini-XLR connectors that couple the bridge to the stalk and array	9 år sedan

The *SpHEAR Project

The *SpHEAR (Spherical Harmonics Ear) Project is a collection of 3D models and ssociated code for building, testing and calibrating full surround Ambisonics microphones. All 3D models are written in Openscad with the code licensed under the GPL 3+ license (GNU Public License version 3 or higher), and the 3D models licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.

The 3D models are almost completely parametric and are designed to be able to be printed on low cost widely available 3D printers (at CCRMA we use an Ultimaker 2 Extended Plus printer, using PLA material). The design is modular and tries to avoid using overhangs and support structures. That is why each microphone assembly is made of a number of independently printed capsule holders interconnected by legs that interlock and hold the structure together. The capsule holders and the mount are glued together to create a 3D structure that securely holds all microphone capsules. A mount that can be clipped into a standard microphone stand is part of the design.

Mailing list

You can subscribe to a development mailing list (sphear-devel@ccrma.stanford.edu) here: https://cm-mail.stanford.edu/mailman/listinfo/sphear-devel

About building microphones

Successfully printing a microphone assembly is only the first step in a long and complicated process. This also includes finding and buying the required microphone capsules, assembling the electronics (requires precision skill with the soldering iron) and finally calibrating the multi-capsule microphone to get the best performance out of it (you will need at least a single driver sound source and a calibrated microphone).

The whole process is not easy and requires knowledge of acoustics and electronics, plus a healthy dose of patience and the ability to perform tasks with precision and care. This repository will eventually include more detailed instructions, electronic schematics, suggested and tested parts and software and procedures for calibrating and measuring the microphone, including models for test and calibration rigs.

3D models

The 3D models currently include the TinySpHEAR, a four capsule first order Ambisonics microphone, the Octathingy, an eight capsule second order design by Eric Benjamin and Aaron Heller and preliminary designs for 12 and 20 capsule designs (the BigSpHEAR_12 and BigSpHEAR_20 models). The models will be expanded as testing proceeds.

TinySpHEAR: four capsule first order microphone with simple stand mount
- TinySpHEAR Zapnspark: four capsule first order microphone with four Zapnspark phantom power interfaces and shock mount
[Octathingy](): eight capsule microphone (proof of concept so far)
[BigSpHEAR_12 / BigSpHEAR_20](): 12 and 20 capsule designs (proof of concept)

Electronics

The pcb/zapnspark directory contains the Kicad electrical circuit and printed circuit board design for the Zapnspark phantom power interface. The current printed circuit board design fits into four slots carved inside the body of the TinySpHEAR plus Zapnspark model. Everything is dimensioned for the sizes of the components specified in the parts list, any changes (specially the diameter of the electrolytic capacitors) would need to be taken into account by changing appropriate model parameters.

Calibration

The calibration/src directory contains the Octave files for the current calibration software. The CALIBRATION.md file in there has a very brief description of usage, but currently is out of date with the current source code. Look into the individual files for more guidance. Hopefully this will be fixed soon.

README.md