A Crookes radiometer, despite what many explanations claim, does not work because of radiation pressure. When light strikes the vanes inside the near-vacuum chamber, it heats the vanes, which then …read more (https://hackaday.com/2025/11/22/building-an-acoustic-radiometer/)

DIY TENS Machine is a Pain-Relief PCB
https://hackaday.com/2025/11/22/diy-tens-machine-is-a-pain-relief-pcb/

Transcutaneous Electrical Nerve Stimulation (TENS) is one of those things that sounds like it must be woo when you first hear of it. “A trickle of current that can deal …read more (https://hackaday.com/2025/11/22/diy-tens-machine-is-a-pain-relief-pcb/)

Assistive Radio Tells You What You Can’t See
https://hackaday.com/2025/11/22/assistive-radio-tells-you-what-you-cant-see/

We think of radios as audio devices, but for people who are visually impaired, it can be difficult to tell which channel you are listening to at any given time. …read more (https://hackaday.com/2025/11/22/assistive-radio-tells-you-what-you-cant-see/)

DIY Polyphonic Synth Sings in 8-Part Harmony
https://hackaday.com/2025/11/22/diy-polyphonic-synth-sings-in-8-part-harmony/

There’s just something about an analog synthesizer. You’d think that for electronic music, digital sampling would have totally taken over by now, but that’s really not true. The world of …read more (https://hackaday.com/2025/11/22/diy-polyphonic-synth-sings-in-8-part-harmony/)