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SpHEAR
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Fernando Pablo Lopez-Lezcano d50b3afe53 remove bottom capsule from the TinySpHEAR_EM182 file as we are not using that anymore - we have to clean up the rest of the files as well 9 gadi atpakaļ
attic 0dfe14d5cd move old calibration 3d model directory to attic (unused stuff) 10 gadi atpakaļ
calibration 90b5eadd79 add a design example that outlines the process of designing a simple A to B encoder 9 gadi atpakaļ
doc 073157dec3 final TinySpHEAR 12 pin DIN connector wiring 9 gadi atpakaļ
pcb f6a275ed95 zapnspark: transform molex pin connector pads into smd pads to solder wires directly to the pcb instead of using connectors, should make it slightly easier to assemble the microphone; manually update the component location pdf and svg with new locations 10 gadi atpakaļ
pictures 67b476c7a5 rotate pictures, adjust width of pictures in page 10 gadi atpakaļ
.gitignore ad103a6c45 ignore stl, gcode and backup files in local copy 9 gadi atpakaļ
BigSpHEAR.scad 80c64a6157 add initial 12 capsule design to repository 11 gadi atpakaļ
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 gadi atpakaļ
CCRMA_logo.scad 357524d3bf fixed 2-manifold issue with logo by splitting one of the polygons 10 gadi atpakaļ
Octathingy.scad eefa3b97fa push the latest (very old) changes to the Octathingy design 10 gadi atpakaļ
Octathingy_EM182.scad dbbd6904fb add triangular legs as a default for EM182 and EM200 Octathingy 9 gadi atpakaļ
Octathingy_EM200.scad 0c265d05ee redesign the Octathingy upper flare to be shorter and similar to the quad capsule design, resize windscreen to match new design, tie windscreen mounting thread size to radius of main body 9 gadi atpakaļ
Octathingy_common.scad b1a284bc77 add Octathingy model with a microphone mount for the zapnspark boards 10 gadi atpakaļ
Octathingy_mount_pcb.scad 8389cd8cc8 add Octathingy direct mount to quik release stand (rigid instead of shock mount), useful for calibration 9 gadi atpakaļ
README.md b5463e2760 added very brief descriptions of the PCB design and calibration software 10 gadi atpakaļ
SpHEAR_common.scad 777beabdae much better design for connector from microphone mount to microphone stand, add one version with threaded bottom in addition to the one for quik-release mount 9 gadi atpakaļ
SpHEAR_windscreen.scad 90a3a08f9a small changes to the windscreen design 9 gadi atpakaļ
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 gadi atpakaļ
TinySpHEAR_EM182.scad d50b3afe53 remove bottom capsule from the TinySpHEAR_EM182 file as we are not using that anymore - we have to clean up the rest of the files as well 9 gadi atpakaļ
TinySpHEAR_EM200.scad ccbb2e3b20 sphear windscreen improvements, switch to a thread based attachment of the windscreen to the microphone, many fixes, add render functions, modify em200 version to render the full microphone including the windscreen 9 gadi atpakaļ
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 gadi atpakaļ
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 gadi atpakaļ
TinySpHEAR_common.scad fa83090c8e render a tetrahedral capsule array with all capsules having three standard horizontal legs, they all interlock much better than before and the geometry of the array is almost perfect without having to visually look at it while glueing the capsules together 9 gadi atpakaļ
TinySpHEAR_mount_pcb.scad 119baa4d84 remove windscreen components from the TinySpHEAR_mount_pcb file 9 gadi atpakaļ
TinySphEAR.scad 3f6a270667 really push changes to TinySpHEAR_common.scad, TinySpHEAR_mount_pcb.scad and TinySphEAR.scad 10 gadi atpakaļ
db25.scad 0867c40109 Octathingy: add new bottom flare to single DB25 connector, first try at new design for the shock mount 9 gadi atpakaļ
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 gadi atpakaļ

README.md

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.