Top all-time · #9446
halcy log
Personal blog · halcy.de/bloghardwarescienceprogramming
halcy log is a personal blog at halcy.de about hardware, science and programming. Since 2007, 8 different Hacker News readers have linked it 8 times, most often “Measuring power network frequency using junk you have in your closet”. It is still writing: the last post was on 2026-10-17, and you can follow it by feed.
Too few sampled comments (2) to say how often HN recommends it.?
Why HN links it
HN readers link halcy.de for hands-on electronics posts, including one on measuring mains power frequency with an audio cable and one on ultrasound data transmission at 18-20 kHz.
Summarised by Claude from a sample of 2 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Most-linked posts?
- Measuring power network frequency using junk you have in your closet3 people · 3 mentions · first linked 2025-02-10
What Hacker News says?
> What I wanna know is if I could have a plug-in box that detects the frequency is drifting Yes, it's not that hard. There's smart meters and plugs that have frequency measurement built in. You can even do it with an audio cable: https://halcy.de/blog/2025/02/09/measuring-power-network-fre...
Comment linking /blog/2025/02/09/measuring-power-network-frequency-using-junk-you-have-in-your-closet/
on “Widespread power outage in Spain and Portugal”Submitted Transmitting data via ultrasound without any special equipment as a story · 142 points
HN discussionThey are using the 18-20Khz range though ( https://halcy.de/blog/images/2025_06_27_fsk.png )
Comment linking /blog/images/2025_06_27_fsk.png
on “Transmitting data via ultrasound without any special equipment”Submitted Measuring power network frequency using junk you have in your closet as a story · 78 points
HN discussionSubmitted QR Codes that can be read multiple different ways as a story · 4 points
HN discussionSubmitted Google threatens to close German office in reaction to internet surveillance law as a story · 3 points
HN discussionSubmitted Measuring power network frequency using junk you have in your closet as a story · 1 points
HN discussionSubmitted How not to mess up your scientific talk as a story · 1 points
HN discussion
