Taking Electronics to a Different Level
https://hackaday.com/2025/12/14/different-approaches-to-level-shifting/

One part wants 3.3V logic. Another wants 5V. What do you do? Over on the [Playduino] YouTube channel, there’s a recent video running us through a not-so-recent concern: various approaches …read more (https://hackaday.com/2025/12/14/different-approaches-to-level-shifting/)

Finally, A Pipe Slapophone With MIDI
https://hackaday.com/2025/12/14/finally-a-pipe-slapophone-with-midi/

If you live in a major city, you’ve probably seen a street performer with some variety of slapophone. It’s a simple musical instrument that typically uses different lengths of PVC …read more (https://hackaday.com/2025/12/14/finally-a-pipe-slapophone-with-midi/)

It Only Takes a Handful of Samples To Poison Any Size LLM, Anthropic Finds
https://hackaday.com/2025/12/14/it-only-takes-a-handful-of-samples-to-poison-any-size-llm-anthropic-finds/

It stands to reason that if you have access to an LLM’s training data, you can influence what’s coming out the other end of the inscrutable AI’s network. The obvious …read more (https://hackaday.com/2025/12/14/it-only-takes-a-handful-of-samples-to-poison-any-size-llm-anthropic-finds/)

Hackaday Links: December 14, 2025
https://hackaday.com/2025/12/14/hackaday-links-december-14-2025/

Fix stuff, earn big awards? Maybe, if this idea for repair bounties takes off. The group is dubbed the FULU Foundation, for “Freedom from Unethical Limitations on Users,” and was …read more (https://hackaday.com/2025/12/14/hackaday-links-december-14-2025/)

All-Screen Keyboard Has Flexible Layouts
https://hackaday.com/2025/12/15/all-screen-keyboard-has-flexible-layouts/

Most keyboards are factory-set for a specific layout, and most users never change from the standard layout for their home locale. As a multilingual person, [Inkbox] wanted a more flexible …read more (https://hackaday.com/2025/12/15/all-screen-keyboard-has-flexible-layouts/)

Mass Spectrometer Tear Down
https://hackaday.com/2025/12/15/mass-spectrometer-tear-down/

If you have ever thought, “I wish I could have a mass spectrometer at home,” then we aren’t very surprised you are reading Hackaday. [Thomas Scherrer] somehow acquired a broken …read more (https://hackaday.com/2025/12/15/mass-spectrometer-tear-down/)

A Brief History of the Spreadsheet
https://hackaday.com/2025/12/15/a-brief-history-of-the-spreadsheet/