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Fernando Pablo Lopez-Lezcano 9468249d5e properly join the flares with the mount stalks introducing mint_thin slices for the hulls, make the wall of the flare constant thickness, make stalk the same thickness as the flare, add an additional transition between flare and stalk, add transition in the lip to avoid overhangs while printing, replace top ellipsoid microphone array mount in TinySpHEAR with a rounded box which gives better cable clearance		10 éve
attic	0dfe14d5cd move old calibration 3d model directory to attic (unused stuff)	10 éve
calibration	db62e3cdf0 Add 'calibration/src/' from commit '0036753f8ccd35dba74933b501e1c73cf7744d22'	10 éve
doc	54e225167d add EM182 and EM200 documentation and specs	10 éve
pcb	70216b43c9 latest PCB render, some minor changes	10 éve
pictures	67b476c7a5 rotate pictures, adjust width of pictures in page	10 éve
BigSpHEAR.scad	80c64a6157 add initial 12 capsule design to repository	11 éve
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 éve
CCRMA_logo.scad	357524d3bf fixed 2-manifold issue with logo by splitting one of the polygons	10 éve
Octathingy.scad	eefa3b97fa push the latest (very old) changes to the Octathingy design	10 éve
Octathingy_EM182.scad	e3d85bb82b add Octathingy design optimized for EM200 capsules, fix a couple of issues in the mount	10 éve
Octathingy_EM200.scad	e3d85bb82b add Octathingy design optimized for EM200 capsules, fix a couple of issues in the mount	10 éve
Octathingy_common.scad	b1a284bc77 add Octathingy model with a microphone mount for the zapnspark boards	10 éve
Octathingy_mount_pcb.scad	9468249d5e properly join the flares with the mount stalks introducing mint_thin slices for the hulls, make the wall of the flare constant thickness, make stalk the same thickness as the flare, add an additional transition between flare and stalk, add transition in the lip to avoid overhangs while printing, replace top ellipsoid microphone array mount in TinySpHEAR with a rounded box which gives better cable clearance	10 éve
README.md	b5463e2760 added very brief descriptions of the PCB design and calibration software	10 éve
SpHEAR_common.scad	9468249d5e properly join the flares with the mount stalks introducing mint_thin slices for the hulls, make the wall of the flare constant thickness, make stalk the same thickness as the flare, add an additional transition between flare and stalk, add transition in the lip to avoid overhangs while printing, replace top ellipsoid microphone array mount in TinySpHEAR with a rounded box which gives better cable clearance	10 éve
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 éve
TinySpHEAR_EM182.scad	8f854699e0 add new shared include in TinySpHEAR EM182 and EM200 models	10 éve
TinySpHEAR_EM200.scad	8f854699e0 add new shared include in TinySpHEAR EM182 and EM200 models	10 éve
TinySpHEAR_common.scad	8f854699e0 add new shared include in TinySpHEAR EM182 and EM200 models	10 éve
TinySpHEAR_mount_pcb.scad	9468249d5e properly join the flares with the mount stalks introducing mint_thin slices for the hulls, make the wall of the flare constant thickness, make stalk the same thickness as the flare, add an additional transition between flare and stalk, add transition in the lip to avoid overhangs while printing, replace top ellipsoid microphone array mount in TinySpHEAR with a rounded box which gives better cable clearance	10 éve
TinySphEAR.scad	3f6a270667 really push changes to TinySpHEAR_common.scad, TinySpHEAR_mount_pcb.scad and TinySphEAR.scad	10 éve

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