Covert radio pen with bone conduction speaker

TL;DR

A ballpoint pen is converted into an audio device with a bone conduction speaker, providing sound through the skull rather than the air.

Transcript

today on Applied Science I'd like to talk about this a ballpoint pen into which I've built a radio and a bone conduction speaker so that when I bite down on a speaker part of the pen I can hear the audio from the radio like this also I'd like to let you know that I signed up with patreon comm and this will allow you to make donations to my channel ... Read More

Key Insights

• ☠️ Bone conduction technology allows for sound to be transmitted through the skull, providing an alternative audio delivery mechanism.
• 🤗 The pen utilizes a piezo transducer strip encased in epoxy to convert electrical energy into mechanical vibrations.
• ☠️ Impedance matching is crucial for efficient functioning of the bone conduction speaker.

Questions & Answers

Q: How does bone conduction work in the context of this ballpoint pen?

Bone conduction in this pen involves using a piezo transducer strip that converts electrical energy into mechanical vibrations, which are then transferred to the cochlea through the skull, enabling audio perception.

Q: What other components are incorporated into the pen, aside from the bone conduction speaker?

The pen also includes a tiny FM radio, batteries, and an impedance matching transformer to convert the headphone output to a higher impedance level suitable for driving the piezo transducer.

Q: Could this technology be integrated into other devices or applications?

Yes, the creator suggests using a Bluetooth earphone and embedding the bone conduction system into it. This would allow users to feel phone notifications and conduct covert listening by pressing the device against their tooth.

Q: What are some potential use cases for this technology?

Besides covert listening or receiving phone calls, one idea is incorporating the bone conduction system into a Camelbak mouthpiece, enabling users to answer calls while engaged in sports or outdoor activities without the need for headphones.

Summary & Key Takeaways

• The content discusses the creation of a ballpoint pen with a built-in radio and bone conduction speaker, allowing the user to hear audio by biting down on the pen.

• Bone conduction means that sound waves travel through the skull into the cochlea instead of through the air into the ear.

• The pen utilizes a piezo transducer strip encased in epoxy, a tiny FM radio, batteries, and an impedance matching transformer.