Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [optoelectronics]

Components, circuits, or systems that convert between electrical and optical (light) energy.

Optoelectronics deals with electrical interfaces to light sources and/or light receivers.

Optoelectronics are often used in control circuits where electrical isolation is required between the source and the receiver (optocoupler) or to convey visible information to a human (LED).

Since optoelectronics is a broad topic, it makes sense to also include some lower-level tags as part of the question. Some examples:

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How does a 4 pin RGB connector work without ground?

The question is in title. Why there is no ground pin on the 12V RGB header? The 5V ARG header which uses only 3 pins has a ground. How does it work without a ground?
DEKKER
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Ruggedizing a component for extended temperature

I am doing a system design presently which involves an OEM optical amplifier module (Dimensions: 220 x 250 x 60mm). It has got an operating temperature range from 0 deg. to 40 deg.C. However, my system is supposed to operate all the way from 60…
Avin
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Please help me understand how this inductive proximity sensor works

I'm trying to build out an optocoupler circuit to connect a new proximity sensor to my 3D printer and want to understand how it behaves before implementing. It's a Printrbot Simple Metal, Printrboard R5, and the stock Z-probe is a 4mm inductive…
SammerV
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Is it possible to use an optointerrupter as a optoisolator?

I currently can't buy an optoisolator, so I was wondering if I could wrap a optointerrupter in tape to shield it from light and use that as an optoisolator. Is this possible?
Bram Wyllie
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How to calculate exactly resistors values of opto coupler

Optocupler: FAIRCHILD MOCD207M According to the data sheet with If=1mA minimum CTR is 34%. Using series resistor of 1.5k at 3.3V gives If= (3.3-1.2) / 1.5k = 1.4mA. The collector is connected to a 30k pull up resistor. It is directly connected…
user38682
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Lowest noise, low frequency, cheap photodetector configuration?

Currently we are measuring the position of a mechanical beam by illuminating it with light from an IR diode and using two phototransistors to measure the difference between light passing over and under it. The combined signal then feeds a PID loop…
Dirk Bruere
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sensitivity of photodetector

For a project, I will be using a Avago 2310Z photodetector. When I went through the datasheet, I could not find the sensitivity mentioned I also looked through couple of datasheets from other companies, but could not find sensitivity…
Abhilash A
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Should I reverse bias phototransistors?

I understand that photodiodes should be reverse-biased, my question is, should I follow the same convention with phototransistors?
Paul Soorenko
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What makes an InGaAs detector more sensitive to infrared light?

What makes an InGaAs detector more sensitive to infrared light than visible light, considering that visible light has a higher photon energy?
Kicr
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Measuring low lux with ambient photodiode

For my application, I need to detect two light levels: pitch black (close to 0 lux) and a low ambient light level of about 0.1 lux (or higher). It seemed like the BH1680FVC ambient light sensor was a good option because it can detect the illuminance…
donut
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Raspberry pi to sense voltages 12 to 24, what buffer is good?

Hello I’m looking to use my raspberry pi in an automotive application where it will be used to detect when the vehicles ignition is activated and de activated. I would like the system to be 24 volt tolerant just to maintain application flexibility.…
Seeedawg
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How do I model the optical coupling between two optoelectronic devices?

I'm building a circuit composed by two parts that are electrically isolating. One part has a LED (model: SIR333) and a phototransistor (model: SFH309FA). I basically have to model the optical coupling between this two optoelectronic devices, using a…
Granger Obliviate
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Optocoupler min collector-emitter voltage

I'm looking for an optocoupler but looks like I don't undersant their parameters well. What is "Optocoupler min collector-emitter voltage"? For example, I found optocouplers like this but in the datasheet it is stated that "Collector-emitter…
BUKTOP
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Great Scott LED VU Meter circuit

I'm looking to complete one of my first electronics projects so I was looking for inspiration from youtube Great Scott and this project caught my eye. In short, his project converts the stereo signal to mono, amplifies it then compares it using a…
Greyhurst
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How is optimum series resistor of an optocoupler sized?

I want to learn how to size the series resistor for this optocoupler which has a high CTR. I will use Arduino's 5V digital output pins for eight of this coupler so I really want to source necessary enough current from each pin. What is the method…
user1245
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