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@adresscomptoir@mastodon.social
2025-06-16 18:53:36

Dank der morgigen FAZ (S.7) lese ich wieder News aus der Schlachtfeldarchäologie, Abteilung Waterloo: "Irgendwann waren die letzten Hinterlassenschaften verkauft. So entstand in den Zwanziger- und Dreißigerjahren des 19. Jahrhunderts eine Gedächtnisindustrie. Bauern säten im Herbst Messingknöpfe auf den Feldern aus, die im Frühjahr mit Patina 'abgeerntet' wurden." Die entsprechende Studie von Wilkin/Schäfer/Homann erscheint im Herbst in der Revue d’Histoire Militaire.

@penguin42@mastodon.org.uk
2025-06-01 01:09:01

I've been using #kicad to reverse my dad's frequency standard, locked off BBC Radio4 198kHz. I'm sure there are bits I've not got right, but the vague shape is there - a loop with input amp/filters from the receiver, which ends up combining with the divided output (at 2kHz) with the output of a 10MHz crystal oscillator based on a 74HC00; that combined result ends up driving a var…

A schematic, screenshotted from kicad.  It's analogue bits and 74 logic.
Another screenshot from kicad, this is just the RF box, all analog
@theodric@social.linux.pizza
2025-06-01 11:18:20

\o/


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