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@penguin42@mastodon.org.uk
2026-01-16 21:37:46

Time to investigate my dad's turntable; a Pioneer PL-15R; so at 33.33RPM, and with a disk with 64 edges, that should be 33.33/60*64=35.6Hz - so seeing 35.7Hz off my hacky photodiode sensor makes me very happy; although it's varying a little, but my scopes frequency counter is based off it's display, so hmm. And it's FFT won't go down that low really.

A turntable with a black/white striped paper disc on, over which is hanging a hacky optosensor wired to strip board held in place with a heath-robinson combination of clamps and camera tripod. A scope probe is attached.
A scope trace showing a roughish square wave at about 35.7Hz
A scope trace showing a similar square wave at the top, but now with an FFT at the bottom; this is saying 38.5Hz on the display, but the FFT isn't really detailed enough to tell.
@cowboys@darktundra.xyz
2026-03-15 15:22:19

Updated Dallas Cowboys Depth Chart Following First Wave of Free Agency si.com/nfl/cowboys/onsi/news/u

Updated Dallas Cowboys Depth Chart Following First Wave of Free Agency
How does the Dallas Cowboys depth chart look following their early moves during NFL free agency this offseason?

@cowboys@darktundra.xyz
2026-03-14 14:17:29

Updated Cowboys Salary Cap Space After First Wave of Free Agency si.com/nfl/cowboys/onsi/news/u

Updated Cowboys Salary Cap Space After First Wave of Free Agency
The Dallas Cowboys made several signings during the first wave of NFL free agency, but have also made progress with their salary cap space.

@@arXiv_physicsatomph_bot@mastoxiv.page@mastoxiv.page
2026-02-13 14:09:10

Replaced article(s) found for physics.atom-ph. arxiv.org/list/physics.atom-ph
[1/1]:
- Photodetachment energy of negative hydrogen ions
Maen Salman, Jean-Philippe Karr

@penguin42@mastodon.org.uk
2026-01-05 01:04:35

Note: You should not be able to hear a 'pop' from a photodiode (ahem, I was messing around on a breadboard and had a trimmer for the resistor in series and went too far).

@cowboys@darktundra.xyz
2026-03-12 11:12:31

Updated List of Cowboys Draft Picks Following Osa Odighizuwa, Solomon Thomas Trades si.com/nfl/cowboys/onsi/news/u

Updated List of Cowboys Draft Picks Following Osa Odighizuwa, Solomon Thomas Trades
A look at the Dallas Cowboys full list of draft picks after trading Osa Odighizuwa and Solomon Thomas.

@@arXiv_physicsatomph_bot@mastoxiv.page@mastoxiv.page
2026-01-09 08:05:06

Photodetachment energy of negative hydrogen ions
Maen Salman, Jean-Philippe Karr
arxiv.org/abs/2601.04341 arxiv.org/pdf/2601.04341

@cowboys@darktundra.xyz
2026-03-10 17:12:41

Updated Cowboys Defensive Depth Chart After Day 1 of Free Agency si.com/nfl/cowboys/onsi/news/u

Updated Cowboys Defensive Depth Chart After Day 1 of Free Agency
The Dallas Cowboys have made some headlines on the defensive side of the ball as free agency begins.

@cowboys@darktundra.xyz
2026-03-10 17:04:39

Updated Cowboys Defensive Depth Chart After Day 1 of Free Agency si.com/nfl/cowboys/onsi/news/u

Updated Cowboys Defensive Depth Chart After Day 1 of Free Agency
The Dallas Cowboys have made some headlines on the defensive side of the ball as free agency begins.

@cowboys@darktundra.xyz
2026-03-10 13:12:21

Updated Dallas Cowboys' Salary Cap Space Entering Day 2 of NFL Free Agency si.com/nfl/cowboys/onsi/news/u

Updated Dallas Cowboys' Salary Cap Space Entering Day 2 of NFL Free Agency
The Dallas Cowboys still have some work to do to become salary cap compliant before the official start of NFL free agency and the new league year.