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**dieter** · 25 m 2024, 20:54

päris hästi nagu ei klapi takistite väärtused ja vb ka transi siirded. pigem oodanuks midagi taolist

http://www.learningaboutelectronics.com/images/Dark-activated-switch-circuit.png

ruudulise paberi skeemil huupi julgeks pakkuda toite sissetuleku koht on pote ülemine ots + ja alumine - ja veel alumine ots võiks veel olla ühenduses emitteriga

**Pruelillar** · 26 m 2024, 07:02

Tänan-tänan! Salvestasin skeemi ära. Pakutud skeemil ei ole tundlikkuse muutmise võimalust (mõnedes oludes pole ka tarvis), Õhtupoolikul katsetan pakutud variandi ära..

**ci139** · 17 m 2024, 16:46

üldist https://www.ariat-tech.com/blog/expl...resistors.html

kompensatsioon mitte küll otseselt LDR-le http://rcvt.tu-sofia.bg/ICEST2005_41.pdf -e.g.- kui mõõte-"silla" üks "paaritatud (ideaal variandis)" valgustundlikest elementidest toppida metallkesta . . . aga siis peaks seda valgustama mikrovõimsusega hõõgpirnist blokeerides soojusvoo . . . = ülemised lingid on kasulikud teiste fotoelementide kasutamise puhul . . .

**ci139** · 18 m 2024, 18:04

arvestades komponentide arvu on mõistlikum kasutada komparaatorit või OV-t sim. → https://tinyurl.com/29owaero

ma enda huvist ladusin enam-vähem mõistliku käitumisega test skeemi kokku mitte eriti usaldusväärses simulaatoris → https://tinyurl.com/24fzjxwk

® tiba muudetult → https://tinyurl.com/27zrb67w

**ci139** · 18 m 2024, 22:15

Experimental Characterization of Single-Color Power LEDs Used as Photodetectors

https://www.mdpi.com/1424-8220/20/18/5200

Semiconductor-based light emitting diodes can be used for photon emission as well as for detection of photons. In this paper, we present a fair comparison between off-the-shelf power Light emitting diodes (LEDs) and a silicon photodetector with respect to their spectral, temporal, and spatial properties. The examined LED series features unexpected good sensitivity and distinct optical bandpass characteristic suitable for daylight filtering or color selectivity. Primary application is short range optical underwater communication, but results are generally applicable.

LED as Transmitter and Receiver of Light: A Simple Tool to Demonstration Photoelectric Effect

https://www.mdpi.com/2073-4352/9/10/531

The experimental observations of the photoelectric effect show the properties of quantum mechanics of the electromagnetic field. For this reason, this important effect is commonly used as an introductory topic for the study of quantum physics. The “classical” demonstration of the photoelectric effect is very incisive; unfortunately, the experimental apparatus is not cheap and easy to realize. The typical use of LEDs is as light emitters, but they can be used even as photosensors and, in this case, they are sensitive to wavelengths equal to or shorter than the predominant wavelength it emits. Furthermore, a LED used as detector is sensitive to wavelengths equal to or shorter than the predominant wavelength it emits. This ability of LEDs offers the possibility of developing a simple tool able to demonstrate the photoelectric effect. This paper describes the realization of an economic, simple, easy and safe system to use for the experimental demonstration of the photoelectric effect, based on the LED to LED structure. The paper has educational purposes, oriented towards laboratory teaching activities.

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