Frequency generator
HoldTools
An electronic device that produces signals at selected frequencies for experimentation.
Why it's here
Placed in Hold: 1 article(s) of evidence from 1 source(s), led by research-stage coverage, with 0 in the last 30 days. Confidence 24%. Low accumulated evidence, so it defaults conservatively pending more signal.
Evidence (1)
- 5Hacker News·9/11/2026researchMexican student builds sound-based fire extinguisher
A 16-year-old student in Tamaulipas, Mexico, developed an acoustic fire extinguisher that uses sound waves to suppress flames in a few seconds. The prototype, tested on materials including wood, flammable liquids, and cooking grease, has been named Vortex Tech and will be presented at an international fair.