# 3D Printed Bone Conduction Transducer Box ## Overview http://www.youtube.com/embed/IS2uS_aWTHw?list=UUpOlOeQjj7EsVnDh3zuCgsA ![](https://cdn-learn.adafruit.com/assets/assets/000/015/307/medium800/3d_printing_bone-conductor-hero.jpg?1394829285) If your next project needs some sound, a bone conductor transducer will have you experimenting with all sorts of objects. If you've ever wired a speaker system before, you'll find this DIY electronics project is fun and easy! This incredible speaker does not have a moving cone like most speakers you've seen, instead, a small metal rod is wrapped with the voice coil. When current is pulsed through the coil, the magnetic field causes a piece of metal to expand and contract - if pressed against a flat surface or cavity it turns it into a speaker! ![](https://cdn-learn.adafruit.com/assets/assets/000/015/308/medium800/3d_printing_part-learnings.jpg?1394829323) ## Tools & Supplies - [Soldering Iron](http://www.adafruit.com/products/180) - [Wire Strippers](http://www.adafruit.com/products/527) - [3D Printer](http://www.adafruit.com/category/128 "Link: http://www.adafruit.com/category/128") ## Parts - Amplifier board - we suggest t[he MAX98306](http://www.adafruit.com/products/987) or [TS2012](http://www.adafruit.com/products/1552 "Link: http://www.adafruit.com/products/1552") - [Bone Conductor Transducer](http://www.adafruit.com/products/1674 "Link: http://www.adafruit.com/products/1674") - [150mAh Lithium Ion Polymer Battery](http://www.adafruit.com/products/1317 "Link: http://www.adafruit.com/products/1317") - [Stereo Headphone Jack](http://www.adafruit.com/products/1699 "Link: http://www.adafruit.com/products/1699") - [Slide Switch](http://www.adafruit.com/products/805 "Link: http://www.adafruit.com/products/805") - [JST Battery Ext. Cable](http://www.adafruit.com/products/1131) # 3D Printed Bone Conduction Transducer Box ## 3D Printing ![](https://cdn-learn.adafruit.com/assets/assets/000/015/312/medium800/3d_printing_boneconductor-3dprinted-parts.jpg?1394830966) [Download STLs](http://www.thingiverse.com/thing:269746) The enclosure is a three piece design that snap-fit together. The [bonebox-top.stl](http://www.thingiverse.com/download:489101) part houses the slide switch and audio input jack. The [bonebox-case.stl](http://www.thingiverse.com/download:489100) part houses the amplifier and lithium polymer battery. The [bonebox-bottom.stl](http://www.thingiverse.com/download:489099) part houses the bone conductor transducer exposing the vibrating metal piece but is secured in place with built in clips on the bottom part. The parts are optimized to slice with MakerWare and printed using PLA with no raft or support material. # 3D Printed Bone Conduction Transducer Box ## Circuit Diagram ![](https://cdn-learn.adafruit.com/assets/assets/000/015/306/medium800/3d_printing_boneconductor-circuit-diagram.png?1394827837) Follow the circuit diagram above to connect the components. If your new to electronics, use a bread-board to prototype the circuit before soldering any connections. ![](https://cdn-learn.adafruit.com/assets/assets/000/015/313/medium800/3d_printing_circuit-diagram.jpg?1394831029) ## Stereo Jack Connect the most far left and right terminals to the **R+** and **L+** pins on the TPA2016. The middle terminal will connect to the **R-** pin. You will need to jump the **R-** and **L-** pins with a separate wire. We aren't using both channels, so you can also tie R+ and L+ together to make a basic 'stereo mix' ## Slide Switch Adapter Use a JST extension cable to create a slide switch adapter. The positive cable will split a connection to the two terminals of the slide switch. You will need to shorten the length of the JST extensions as short as possible. To avoid soldering the JST extension that is connected to the switch, use another JST extension to solder into **VDD** and **GND** pins. ## Bone Conductor The bone conductor transducer can be soldered to either the right or left audio channels.Info: ![](https://cdn-learn.adafruit.com/assets/assets/000/015/314/medium800/3d_printing_boneductor-barecircuit.jpg?1394831211) # 3D Printed Bone Conduction Transducer Box ## Assembly ![](https://cdn-learn.adafruit.com/assets/assets/000/015/315/medium800/3d_printing_bonec-audiojack2.jpg?1394833463) ## Stereo Headphone Jack Start by placing the audio input jack into the **[bonebox-top.stl](http://www.thingiverse.com/download:489101)** part by lightly pushing apart the clips and pushing the input jack into the opening. The jack should snap into place with the tips of the clip holding the input jack in place.![](https://cdn-learn.adafruit.com/assets/assets/000/015/316/medium800/3d_printing_bonec-slideswitch.jpg?1394833504) ## Slide Switch Adapter The slide switch is pressed into the **bonebox-top.stl** part by pushing it into the opening. Once it's secured, set it aside. ![](https://cdn-learn.adafruit.com/assets/assets/000/015/317/medium800/3d_printing_bonec-bottom.jpg?1394833555) ## Bone Conductor The bone conductor transducer is secured to the **[bonebox-bottom.stl](http://www.thingiverse.com/download:489099)** part with clips built into the part, similar to the **bonebox-top.stl** part. The metal plate is exposed so that it can transfer audio more efficiently.![](https://cdn-learn.adafruit.com/assets/assets/000/015/318/medium800/3d_printing_bonec-pull-case.jpg?1394833825) Pull the bone conductor transducer and **bonebox-bottom.stl** part through the **bonebox-case.stl** part with the inner lip positioned towards the bottom. ![](https://cdn-learn.adafruit.com/assets/assets/000/015/319/medium800/3d_printing_bonec-amp.jpg?1394833847) ## Amplifier + Lipo Battery Push the amplifier down into the **[bonebox-case.stl](http://www.thingiverse.com/download:489100)** part, it should stop from hitting the bone conductor with the inner lip holding it in place.![](https://cdn-learn.adafruit.com/assets/assets/000/015/320/medium800/3d_printing_bonec-lipo.jpg?1394833864) The lipo battery is placed on top of the amplifier. The slide switch adapter and battery wiring should tightly fit into the **bonebox-case.stl** part. ![](https://cdn-learn.adafruit.com/assets/assets/000/015/322/medium800/3d_printing_bonec-closetop.jpg?1394834351) Gently arrange the wires of the battery and slide switch adapter into the **bonebox-case.stl** part and snap the **bonebox-top.stl** piece into place. ![](https://cdn-learn.adafruit.com/assets/assets/000/015/321/medium800/3d_printing_bonec-bottom-snap.jpg?1394833887) ## Closing it up Coil up the excess wiring of the bone conductor transducer and press fit the **bonebox-bottom.stl** into the **bonebox-case.stl** part. Now your bone conductor transducer is packaged up and ready to turn surfaces into speakers! ![](https://cdn-learn.adafruit.com/assets/assets/000/015/343/medium800/3d_printing_bonec-herofront.jpg?1394838792) # 3D Printed Bone Conduction Transducer Box ## Usage ![](https://cdn-learn.adafruit.com/assets/assets/000/015/341/medium800/3d_printing_bonec-testing.jpg?1394838505) ![](https://cdn-learn.adafruit.com/assets/assets/000/015/342/medium800/3d_printing_bonec-testing2.jpg?1394838533) Works on several different surfaces! Objects that are hollow perform much better than objects that are more dense. Below is a list of materials that it seems to work well with. - Acrylic - Wood - Plastic - Glass The bone conductor transducer produces that best quality sound when it's pressed up against a surface. If the bone conductor box is loosely placed on a surface, it will cause the metal plate to vibrate the surface to much and cause clippy audio. ## Featured Products ### Bone Conductor Transducer with Wires - 8 Ohm 1 Watt [Bone Conductor Transducer with Wires - 8 Ohm 1 Watt](https://www.adafruit.com/product/1674) Drown out the voices in your head with a bone conduction transducer! This incredible speaker does not have a moving cone like most speakers you've seen, instead, a small metal rod is wrapped with the voice coil. When current is pulsed through the coil, the magnetic field causes a piece of... Out of Stock [Buy Now](https://www.adafruit.com/product/1674) [Related Guides to the Product](https://learn.adafruit.com/products/1674/guides) ### Lithium Ion Polymer Battery - 3.7v 150mAh [Lithium Ion Polymer Battery - 3.7v 150mAh](https://www.adafruit.com/product/1317) Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 150mAh for a total of about 0.6 Wh. If you need a larger battery, Out of Stock [Buy Now](https://www.adafruit.com/product/1317) [Related Guides to the Product](https://learn.adafruit.com/products/1317/guides) ### Printrbot Simple Kit - 1405 Model [Printrbot Simple Kit - 1405 Model](https://www.adafruit.com/product/1735) The Printrbot Simple is an exercise in 3D printing minimalism. It includes only what is needed to get started in the world of 3D printing. After building this kit you'll have a fully-functioning 3D printer that weighs only 10 lbs and fits nicely on your desk **Please...** No Longer Stocked [Buy Now](https://www.adafruit.com/product/1735) [Related Guides to the Product](https://learn.adafruit.com/products/1735/guides) ### Breadboard-friendly SPDT Slide Switch [Breadboard-friendly SPDT Slide Switch](https://www.adafruit.com/product/805) These nice switches are perfect for use with breadboard and perfboard projects. They have 0.1" spacing and snap in nicely into a solderless breadboard. They're easy to switch no matter what size fingers you have, but not so easy that they'll get flipped by accident. Work great as... In Stock [Buy Now](https://www.adafruit.com/product/805) [Related Guides to the Product](https://learn.adafruit.com/products/805/guides) ### Breadboard-Friendly 3.5mm Stereo Headphone Jack [Breadboard-Friendly 3.5mm Stereo Headphone Jack](https://www.adafruit.com/product/1699) Pipe audio in or out of your project with this very handy breadboard-friendly audio jack. It's a stereo jack with disconnect-switches on Left and Right channels as well as a center ground pin. You can use any 3.5mm stereo cable with this jack. The pins are on 0.1" spacing so it plugs... In Stock [Buy Now](https://www.adafruit.com/product/1699) [Related Guides to the Product](https://learn.adafruit.com/products/1699/guides) ### JST-PH Battery Extension Cable - 500mm [JST-PH Battery Extension Cable - 500mm](https://www.adafruit.com/product/1131) By popular demand, we now have a handy extension cord for all of our JST PH-terminated battery packs (such as our LiIon/LiPoly and 3xAAA holders). One end has a JST-PH compatible socket, and the other end has a matching plug. Between the two, 500mm of color coded wire. Handy for wearable... In Stock [Buy Now](https://www.adafruit.com/product/1131) [Related Guides to the Product](https://learn.adafruit.com/products/1131/guides) ### Stereo 2.1W Class D Audio Amplifier - TPA2012 [Stereo 2.1W Class D Audio Amplifier - TPA2012](https://www.adafruit.com/product/1552) This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 2.1W channels into 4 ohm impedance speakers (@ 10% THD). Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC. Since the amp is a class D, it's incredibly efficient (89%... In Stock [Buy Now](https://www.adafruit.com/product/1552) [Related Guides to the Product](https://learn.adafruit.com/products/1552/guides) ### Stereo 2.8W Class D Audio Amplifier - I2C Control AGC - TPA2016 [Stereo 2.8W Class D Audio Amplifier - I2C Control AGC - TPA2016](https://www.adafruit.com/product/1712) A mini class D with AGC and I2C control? Yes please! This incredibly small stereo amplifier is surprisingly powerful. It is able to deliver 2 x 2.8W channels into 4 ohm impedance speakers (@ 10% THD) and it has a i2c control interface as well as an AGC (automatic gain control) system to keep... In Stock [Buy Now](https://www.adafruit.com/product/1712) [Related Guides to the Product](https://learn.adafruit.com/products/1712/guides) ## Related Guides - [Boombox Beach Bag with Audio Amp and Speakers](https://learn.adafruit.com/boombox-beach-bag-with-audio-amp-and-speakers.md) - [Mini Mac Pi](https://learn.adafruit.com/mini-mac-pi.md) - [Overwatch Prop Gun: Lucio's Blaster Pt. 3](https://learn.adafruit.com/overwatch-prop-gun-lucios-blaster-pt-3.md) - [Adafruit TPA2012 2.1W Stereo Audio Amplifier](https://learn.adafruit.com/adafruit-ts2012-2-8w-stereo-audio-amplifier.md) - [Adafruit TPA2016 2.8W AGC Stereo Audio Amplifier](https://learn.adafruit.com/adafruit-tpa2016-2-8w-agc-stereo-audio-amplifier.md) - [Han Solo Blaster Cosplay](https://learn.adafruit.com/han-solo-blaster-cosplay.md) - [Overwatch Prop Gun: Lucio's Blaster Pt. 2](https://learn.adafruit.com/overwatch-lucio-gun-pt-2.md) - [Super Game Pi](https://learn.adafruit.com/super-game-pi.md) - [Wave Shield Voice Changer](https://learn.adafruit.com/wave-shield-voice-changer.md) - [LedGames - a BeagleBone Black 64x64 LED Game](https://learn.adafruit.com/ledgames-beaglebone-black-64x64-led-game.md) - [Raspberry Gear](https://learn.adafruit.com/raspberry-gear.md) - [Flora-Powered TARDIS Costume (for Dogs!)](https://learn.adafruit.com/wearable-flora-powered-tardis-costume-dogs.md) - [Electronic Demon Costume](https://learn.adafruit.com/electronic-demon-costume.md) - [Adafruit VS1053 MP3/AAC/Ogg/MIDI/WAV Codec Breakout Tutorial](https://learn.adafruit.com/adafruit-vs1053-mp3-aac-ogg-midi-wav-play-and-record-codec-tutorial.md) - [Magnet Bottle Holder](https://learn.adafruit.com/magnet-bottle-holder.md)