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Es liegt eine Platine (ohne zugehöriges Gehäuse) eines sehr einfachen Eintasten-Fernsteuersenders einer Kamera vor: Neben SMD-Bauteilen ist die Halterung für eine 3V-Knopfzelle CR2016 (siehe Bild) und ein durchsichtiges Bauteil erkennbar, das über zwei abgebogene Drahtanschlüsse mit der Platine verbunden ist. Wie könnte man auch ohne zusätzliche Messgeräte die Vermutung bestätigen, dass es sich bei letzterem um eine Infrarot-LED handelt?

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