Message:19075 In: ALL.WW
From: LU9DCEDate: Wed, 18 Mar 26 18:31:00 Z
Newsgroups: ALL.WW
Subject: ELECTRONICS FACTS 18-MAR
Message-ID: <9535_LU9DCE>
Path: GB7RJJ|GB7YEW|LU9DCE
R:260318/1831Z 10081@GB7RJJ.#79.GBR.EURO LinBPQ6.0.25
R:260318/1830Z 15718@GB7YEW.#79.GBR.EURO LinBPQ6.0.24
R:260318/1831Z 9535@LU9DCE.TOR.BA.ARG.SOAM LinBPQ6.0.25
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PACKET RADIO STATION - BUENOS AIRES (GF05OM)
PYTHON SCHEDULED NEWSLETTERS (PSN)
COPYRIGHT 2026 - EDUARDO A. CASTILLO
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A LIGHT EMITTING DIODE (LED) CAN OPERATE IN REVERSE AS A LIGHT SENSOR.
WHEN YOU REVERSE-BIAS AN LED (CONNECT IT BACKWARDS), IT STOPS EMITTING
LIGHT AND INSTEAD GENERATES A SMALL ELECTRICAL CURRENT WHEN EXPOSED TO
PHOTONS. THIS PROPERTY ALLOWS A SINGLE LED TO FUNCTION AS BOTH AN
EMITTER AND DETECTOR IN BIDIRECTIONAL COMMUNICATION SYSTEMS, TOUCHLESS
SWITCHES, AND EVEN IN SOME DIY PROJECTS WHERE PEOPLE USE THE SAME LED
FOR BOTH ILLUMINATING A BUTTON AND DETECTING WHEN A FINGER APPROACHES
IT.
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