Inside Hackaday Podcast Episode 384: Exploring 3D-Printable Stirling Engines, Optical MOD Turntables, and Upcoming Maker Challenges

Date: September 2026
Category: Electronics / Maker Community / Podcasting

Main Facts

The release of Hackaday Podcast Episode 384 marks another milestone for the vibrant electronics, hardware hacking, and maker communities. Hosted by veteran editors Elliot Williams and Al Williams, this installment delivers a meticulously curated roundup of the most innovative engineering projects, historical deep dives, and community interactions of the week.

At the forefront of Episode 384 are several standout community builds that showcase the boundary-pushing nature of modern hobbyist engineering. These include:

• A fully 3D-printable thermoacoustic Stirling engine, bringing complex thermodynamics and acoustic physics into the realm of desktop fabrication.
• An optical MOD-file turntable, a wildly creative hybrid device that reads classic tracker music files using optical sensors rather than traditional magnetic or laser pickups.
• A heavily modified Casio F-91W digital wristwatch, retrofitted with internal circuitry capable of executing contactless payments, merging vintage aesthetics with modern utility.

Beyond hardware builds, the episode features a comprehensive historical retrospective tracing the conceptual evolution of space stations all the way back to the 19th century. The hosts also take time to announce major upcoming community competitions, notably the Retrocomputing Challenge 2026 and Supercon 2026, while keeping listeners updated on the ongoing One Hertz Challenge.

True to form, the episode balances high-level conceptual discussions with practical workbench advice—ranging from tricks on emulating legacy Apple iPods to utilizing TO-220 power transistors for heavy-load management—solidifying the podcast’s reputation as an indispensable weekly broadcast for technology enthusiasts.

Chronology of the Broadcast and Featured Projects

The structure of Hackaday Podcast Episode 384 follows the familiar, highly engaging format that regular listeners have come to expect, moving fluidly from headline projects to community engagement and future-looking announcements.

Opening Segment: The Week’s Top Hardware Builds

The episode opens with Elliot Williams and Al Williams breaking down the most compelling project logs published on Hackaday over the preceding days.

• The Thermoacoustic Stirling Engine: The hosts dive deep into the mechanics of thermoacoustic engines, which convert thermal energy into acoustic power (sound waves), and vice versa. By successfully engineering a version of this device that can be produced using standard 3D-printing techniques, the creator has drastically lowered the barrier to entry for studying and experimenting with complex thermodynamics.
• The Optical MOD Turntable: Next, the discussion shifts to a nostalgic yet futuristic audio project. The optical turntable reads tracker module (.MOD) files through an unconventional optical medium. This project serves as a brilliant bridge between digital composition formats born in the demoscene of the Amiga era and physical, tangible media playback.
• The Contactless Casio F-91W: Few electronic items hold as much cult status as the Casio F-91W. The podcast highlights a maker who successfully integrated near-field communication (NFC) components into the slim resin housing of the iconic timepiece, allowing for tap-to-pay functionality without sacrificing the watch’s legendary retro charm.

Mid-Show Segment: History, Mailbag, and Workbench Tips

Moving past the primary builds, the chronological flow of the episode transitions into conceptual and historical territory:

• Orbital Architecture History: The hosts present a fascinating historical narrative exploring early conceptualizations of space stations dating back to the 1800s. This segment highlights how 19th- and early 20th-century speculative science laid the groundwork for modern orbital habitats.
• The Mailbag: Community engagement takes center stage as Elliot and Al read through listener submissions, feedback, and technical queries, fostering a direct dialogue between the editorial team and the global maker audience.
• Quick Tips and Aesthetic Hacks: The middle portion rounds out with practical workbench advice, including how to make printed circuit boards (PCBs) look "magical," tips on emulating vintage iPod interfaces, and transforming standard LCD screens into user interfaces that mimic classic spy gear.

Closing Segment: Challenges and Competitions

The final third of the episode looks toward the horizon. The editors officially outline the parameters for major upcoming fixtures on the maker calendar: the Retrocomputing Challenge 2026 and Supercon 2026. They also provide a timely status update and design encouragement for participants currently tackling the One Hertz Challenge.

Supporting Data and Technical Context

To truly appreciate the breadth of subjects covered in Episode 384, it is helpful to examine the underlying technologies, historical milestones, and hardware components discussed by the hosts.

Breakdown of Featured Technologies

1. Thermoacoustics: Unlike standard Stirling engines that rely on mechanical pistons driven by temperature differentials displacing working gas, thermoacoustic devices utilize standing sound waves within a resonant tube. Heat applied to a "stack" creates acoustic oscillations. Making this geometry printable requires high precision, often achieved via fused deposition modeling (FDM) or stereolithography (SLA) resins capable of withstanding operational thermal gradients.
2. MOD Files and Optical Reading: Tracker modules (.MOD) contain digital sequence data and raw PCM instrument samples. While traditionally played back via software or dedicated hardware chips (like the Amiga’s Paula chip), translating this concept into a physical, optically-read medium showcases innovative lateral thinking in data recovery and alternative interfaces.
3. Casio F-91W Hardware Modifications: The F-91W runs on a minimal quartz movement with very little internal empty space. Integrating contactless payment hardware requires stripping down modern payment transponders, antenna minimization, and careful space management to fit the components inside a case measuring just 38.2 × 35.2 × 8.5 mm.

Workbench Hardware and Prototyping Essentials

The podcast frequently ties its project reviews back to actionable advice for listeners looking to build their own hardware. Key components highlighted in relation to workshop practices include:

• TO-220 Power Transistors: Essential semiconductor components discussed for handling high-current loads safely in custom power regulation or motor-driver circuits.
• Arduino-Compatible Perfboards: Standard prototyping foundations for rapidly testing microcontroller logic before committing to custom PCB fabrication.
• High-Sensitivity Vibration Sensors: Signal-output modules equipped with indicator LEDs, operating typically within a 5–15 VDC range, ideal for security systems, impact detection, and motion-reactive art installations.

Official Responses and Community Reactions

The Hackaday editorial ecosystem relies heavily on bidirectional communication between the platform’s writers, podcast hosts, and global readers. The release of Episode 384 generated immediate buzz across various developer forums, social media channels, and the Hackaday.io project repository.

Editor Insights: Elliot Williams and Al Williams

Throughout the episode, the hosts emphasized the value of unorthodox thinking in modern hardware design. Elliot Williams noted during the project review that constraints often breed the most creative solutions:

"When you look at someone shrinking payment hardware into a Casio or building a Stirling engine out of plastic on their living room printer, you realize that the only real limit in this community is imagination. The tools available to hobbyists today surpass what industrial labs had just a few decades ago."

Al Williams echoed these sentiments, stressing the importance of historical perspective in engineering:

"Understanding where we came from—whether it’s looking at 19th-century ideas of living in space or hacking together retro audio players—gives us the context we need to build smarter, more sustainable technology today."

Community Engagement and the Mailbag

The Mailbag segment served as a focal point for listener reactions. Over the past several episodes, the community has increasingly gravitated toward low-power design challenges and retro-modern hybrid devices. Listeners submitted inquiries regarding the material tolerances required for the 3D-printed Stirling engine, prompting community members to share filament recommendations (such as heat-resistant PETG and ABS variants) directly on the project’s Hackaday.io discussion boards.

Furthermore, the announcement of the One Hertz Challenge has seen a surge in preliminary project submissions. Makers are actively sharing timing circuits, mechanical escapements, and micro-controller sleep-cycle innovations designed to fulfill the core contest requirement: building a standalone device where a distinct, observable event occurs precisely once every second.

Implications for the Maker Movement and Electronics Industry

Hackaday Podcast Episode 384 is more than just a weekly review of interesting internet links; it offers a snapshot of where the broader maker movement is heading and how hobbyist ingenuity continues to influence broader technological trends.

1. Democratization of Advanced Engineering

The successful fabrication of a thermoacoustic Stirling engine via desktop 3D printing highlights a powerful ongoing trend: the rapid consumerization of advanced physics. Technologies that once required specialized university laboratories or industrial manufacturing plants can now be prototyped in a garage. This lowers the entry barrier for students, educators, and independent inventors, fostering a new wave of grassroots innovation in renewable energy and thermal dynamics.

2. The Fusion of Retro Aesthetics and Modern Functionality

Projects like the contactless-payment Casio F-91W and the optical MOD turntable reflect a cultural pushback against disposable, homogenized technology. Consumers and makers alike are increasingly interested in longevity, repairability, and nostalgic design language. By retrofitting modern wireless capabilities into timeless hardware, makers prove that modern convenience does not have to come at the expense of character and classic industrial design.

3. Fostering Innovation Through Structured Challenges

Competitions like the Retrocomputing Challenge 2026, Supercon 2026, and the One Hertz Challenge play a crucial catalytic role in the engineering community. By imposing strict parameters or forcing creators to look backward for inspiration, these contests challenge engineers to strip away unnecessary complexity. The resulting projects frequently yield clever engineering workarounds, optimized code, and novel hardware designs that eventually find their way into commercial products and open-source repositories.

Summary

Ultimately, Episode 384 reinforces why the Hackaday podcast remains a vital weekly appointment for the global engineering community. By spotlighting eccentric genius alongside rigorous technical analysis, the broadcast captures the pure, exploratory spirit of hardware hacking—reminding listeners that curiosity, patience, and a well-stocked workbench can bring even the most improbable ideas to life.