Questions tagged [optoelectronics]
Components, circuits, or systems that convert between electrical and optical (light) energy.
269 questions
-1
votes
2
answers
94
views
optical path resonance distance measurement device, super useful for open source hardware if it would work [closed]
My head just tends to be full of open hardware and open manufacturing stuff, and one idea I have had for years and always wanted to try, but never could for want of access to an electronics lab, is a ...
0
votes
2
answers
1k
views
LOGIC GATES and logic circuits in a calculator
i am tasked to do a circuit using logic gates regarding the work of a calculator. it is said that how can we make number 3 shown in a calculator represented by logic gates. can someone help me?
i ...
- 11
0
votes
2
answers
141
views
Identifying mystery dual channel opto detector?
How do I identify if a component is a photo diode or photo transistor? I have a three lead component removed from an old mouse where it was used to do quadrature encoding of the scroll wheel (a normal ...
- 483
0
votes
1
answer
456
views
MID400 used in "Unsaturated" Mode
I've been spec'd a MID400 in a high voltage A/C power monitor circuit. After receiving the prototype (board is done), I've determined this device is for power on/off application. Problem is I need to ...
- 251
0
votes
1
answer
474
views
What is comparison of readout times of global and rolling shutter cameras? [closed]
Rolling shutter will take more time because of sequential readout and global will take less time.But what are the exact values of image readout time?
3
votes
4
answers
2k
views
Why we use two photodiodes as optoisolator or optocoupler?
Why do we need two photodiodes in order to create an optoisolator or optocoupler? Many sources say that it is to compensate for the non-linearity of the diodes, but is there any explanation based on ...
- 39
1
vote
2
answers
3k
views
24 VAC Detection Using Optocoupler
I have been using an HCPL3700 to detect 24VAC, but they are large and relatively expensive. I have tested the design shown in the figure (AC input to the diode, and measuring output collector-emitter ...
- 83
0
votes
1
answer
1k
views
Design of output stage for CNY70 reflective sensor
I have built the following circuit for a reflective sensor:
The resistor \$R_D\$ has been given the value 200 \$\Omega\$ and the resistor \$R_T\$ is to be dimensioned. \$V_{CC}\$ is 5 V.
I have ...
- 25
2
votes
1
answer
364
views
Questions about CNY70 Reflective Optical Sensor datasheet
I am using the CNY70 for a project, but i need information from the datasheet. In Figure 11, which i have added below, the relative collector current, \$I_{Crel}\$, is shown versus the displacement, s,...
- 25
-2
votes
2
answers
351
views
Automatic room light controller with IR sensor
(Schematic source: Electronics Hub)
In this circuit sensor is not working.using (4*1.5)v cells as supply.without connecting the transmitter and receiver elements,in the o/p led glows.i have connected ...
2
votes
1
answer
2k
views
SWD optoisolation problem
I have designed the following optoisolator for SWD interfacing with an STM32 device and J-LINK programmer:
This is the generic schematic:
And this is a single optoisolator schematic:
I am not able ...
- 1,699
5
votes
2
answers
2k
views
Typical wavelength range for solar cell measurement
Why is a wavelength range of 300nm-1100nm usually used to investigate the properties of solar cells (EQE, current generated, etc.)? Is it to reduce spectral impact? I also don't understand what is ...
- 59
0
votes
1
answer
853
views
Detect if the load is present on this circuit
Is there a way to detect if the load is conected on the circuit above?
(The other load should be connected to the F Pad, sorry for the mistake).
0
votes
0
answers
264
views
Low cost low speed fiber optic connection for embedded applications
I would like to use a fiber connection to send data between two nodes. The nodes would typically have a 8 or 32 bit micro controller. I need data rate of 2 Mbps or higher and distance is about 100 ...
- 969
5
votes
1
answer
684
views
Q: Check if an LED in my circuit is still "good"
I have an electrical circuit which uses an LED, connected to a µC, to show the status of an x-ray source in another room. Obviously this LED is important to have in a working condition.
Now, LEDs can ...
- 621
0
votes
0
answers
162
views
Material choice / optical properties for solar panel cover (glass/perspex/lexan)
First off I realise this is sort-of off-topic but this was the most relevant stack site I could think of...
I have a Bosch solar panel which was damaged by couriers, the glass covering was shattered ...
- 7,209
0
votes
1
answer
907
views
4n25/35 optocoupler detect led on/off
Hey all i am just wondering if my drawing below is correct in order to have an arduino detect an on or off led on another board using a optocoupler?
My thoughts of the above drawing is that when the ...
- 805
0
votes
2
answers
4k
views
LED response time (time to warm up)
Can someone help me to explain why LED have better response time when compare with other light source (ex:fluorescent lightbulb). Because their structure or anything else? Thanks everyone so much.
2
votes
1
answer
949
views
How Gigabit Ethernet is achieved in fiber optics?
I understand how 1000BaseT works on Cat 5 cables: It uses clock rate at 125 MHz, 4D-PAM5 data encoding to transmit 2 bit per cycle and it uses the four pairs of the cable. The math is quite simple: ...
- 83
0
votes
3
answers
260
views
Why is this circuit isolated?
From Linear Optical Isolation for Safe Sensor Operation:
Are the three grounds indicated all connected?
Are the four Vcc indicated all connected?
If the above is all true, how could this be an ...
- 3,259
-1
votes
2
answers
4k
views
Minimal component set to build a computer mouse [closed]
I am searching for a DIY set to build an optical mouse.
What I need is a bare minimum set, giving the ability to build
a very small mouse without buttons, and possibly for beginners.
Should be ...
- 277
0
votes
1
answer
1k
views
Isolating Digital IO from Microcontroller
I have designed an Embedded System in which the PCB has both Non-Isolated and Isolated DC DC converter.
I am taking a 24V DC Supply from a PLC Device. Converting it to 3.3V with a Non -Isolated DC DC ...
0
votes
0
answers
54
views
Check if signal drifts are temperature related
Let’s say I have an output signal vs time plot data of some opto-electrical device (a black box for me). If the device is exposed to sunlight the signal starts to drift to higher values.
Is there a ...
- 37
0
votes
1
answer
575
views
Solid angle measurement conditions for radiant intensity specification in IR-LED's data-sheets
For some IR-LED's their data-sheets state Radiant Intensity and the conditions under which
that number was obtained, indicating also which solid angle was used for the measurement.
For example, this ...
- 37
0
votes
1
answer
184
views
How to connect chip pin to either vcc or groud externally?
I have a board that i use ic which one pin need to be externally decided to be connected to VCC or ground based on LED lightening
The schematic use this symbol for a connector to indicate this
How ...
- 45
0
votes
1
answer
356
views
Test an LCD for missing segments without looking at the screen? [closed]
I have a product with an LCD screen that sometimes fails with missing segments.
I will test the product for a long time to replicate the failure.
I will test many at once.
I don't want to sit watching ...
0
votes
2
answers
2k
views
What can I use instead of a CD4007 transistor? [closed]
What can I use instead of a CD4007 transistor, or how can I simply design a "20 watt or larger" speaker using a "TBA810" or any available widely available and used IC?
I found this circuit: Touch ...
4
votes
3
answers
3k
views
pc817 large emiter collector voltage drop in saturation
I'm experimenting with a very simple circuit with a PC817 optocoupler. I just want to turn on an LED with the optocoupler output, but the bright is really low in comparison to a direct drive of the ...
- 143
1
vote
2
answers
249
views
Lowest noise, low frequency, cheap photodetector configuration? [closed]
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 ...
- 14.3k
1
vote
1
answer
2k
views
How is the H11AA1 ic working with AC mains voltage?
I am making an arduino controlled fan speed controller that would digitally control the speed of my ceiling fan working on 230 VAC and 50 Hz. I am using the following circuit which is designed for ...
- 507
5
votes
5
answers
5k
views
Why are vactrols not commonly used?
I've been trying to get my hands on some vactrols (opto-variable resistor) for a long time, unsuccessful. Not even Digi-Key has them.
Some examples: VTL5C2, VTL5C3, NSL32
I can't see them as "too ...
- 528
0
votes
1
answer
852
views
How to connect 111ager Solid State Relay with Arduino to control a [email protected] load
I just bought from ebay 111ager SSR 3-32VDC input power supply with load current upto 5A @ 5-220VDC. Link to the product: (https://goo.gl/MOkAU3).
I wanted to use it to control a [email protected] load using ...
- 11
24
votes
3
answers
5k
views
How does a 40 Gbit/s Ethernet interface process packets in silicon?
A 40 Gbit/s Ethernet interface should have a 40 GHz signal on it. How does common silicon IC technology handle such an exotic beast?
My best guess is that internally various parallel busses are used, ...
- 358
1
vote
1
answer
115
views
Designing a dental furnace control board
I have a few question about designing a heater control board . Firstly I took a power electronics lecture in the university eon ago but now I try to remember it anew. :)) Regarding my subject, I have ...
- 13
0
votes
1
answer
1k
views
Opto coupler keeps on breaking
Good day,
I am building an H-bridge (picture below). My opto couplers were ILQ74. I am using 560 ohm current limiting resitors for the opto coupler diodes, with an input voltage of 3.3V (from MCU). ...
- 73
2
votes
3
answers
2k
views
IR receiver output pulsating instead of constant one('5V') or zero ('0V')
I am trying to detect the size of different bottles on a conveyor belt and for that I thought of using IR transmitter and receiver but I am not getting desired output. I want the output of IR receiver ...
- 23
1
vote
3
answers
4k
views
Digital Optical Volume Control with LED and photoresistor (light to seperate circuits, optical pot)
Story
At first, I know the existence of a digital pot. 'Problem' is you need an IC to achieve this and also want to keep the circuits completly separated (and simple). Also want to use it with an ...
- 1,377
0
votes
3
answers
678
views
Relation between collector current and IF current in an optocoupler?
I need to use an optocoupler to drive BJT. BJT will let 10 A current pass. BJT's have commonly 100 - 150 Bf(current gain) so for 10A transmission I need at least 100 mA current draw from the ...
- 1,333
1
vote
2
answers
148
views
Mach Zehnder phase change?
According to Comsol, a multiphisics simulation software company, a mach zehnder modulator "modulates" the input signal by splitting it into two parallel branches, affecting the relative phase on one ...
0
votes
1
answer
141
views
Identify this electronic component from DVD drive [closed]
I got this component from an old laptop dvd drive. It was placed within the laser assembly. Could you tell me what this component may be?
0
votes
3
answers
1k
views
Is there a way to adapt a TSSOP pad to a SOIC-16 IC?
So I messed up and printed a circuit board with 16 TSSOP pad when I actually need a SOIC-16 pad!!! Is there a clever way of somehow adapting the TSSOP pad to a SOIC-16 chip?
- 181
1
vote
2
answers
721
views
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 ...
- 21
0
votes
2
answers
351
views
optoisolator triggered by arduino
I'm finding it difficult to understand how to read this optoisolator documentation.
Here is the optoisolator: http://html.alldatasheet.com/html-pdf/92367/TOSHIBA/TLP222A-2/248/1/TLP222A-2.html
The ...
0
votes
1
answer
2k
views
Optocoupler calculate resistance on output
How do I calculate the resistance between the Anode and the Cathode of an Optocoupler (while the optocoupler is on).
I am messing aroung a little bit with optocouplers and found out using an ...
- 11
0
votes
1
answer
2k
views
Optocoupler 4N25 saturated CTR
I'm studying optocouplers in general, and in special the 4N25.
I'm applying the optocoupler in a zero crossing circuit, like this one:
I know the CTR is minimum of 20%, but checking the datasheet ...
- 127
0
votes
2
answers
7k
views
Opto-coupled PWM output
I have a circuit with two different ground levels. Using a optocoupler, I want to translate a PWM signal to the new ground level.
Does there exist a easier method than the following? (Ideally with ...
- 5,239
1
vote
1
answer
2k
views
What bandwidth is needed for an arbitrary digital signal?
I am building a fiber-optic data link, with a laser driver and photodiode receiver. My goal is to transmit data at 50Mbit/s. I'm looking for what bandwidth this would take.
Obviously 50MHz would not ...
- 780
0
votes
1
answer
5k
views
What is optical bandwidth and electrical bandwidth
I was reading a book about Optical Wireless Communication.
In the chapter where the transmitters are explained, there is a figure showing two types of bandwidth for LEDs.
This confused me a bit, ...
- 121
-3
votes
1
answer
98
views
What electronic component is this? - sensor part of particulate matter sensor [closed]
What electronic component is this?
This is a part of a laser sensor which measures particulates.
- 345
5
votes
2
answers
1k
views
Wrong Sign in the Output of 80MHz Transimpedance Amplifier
I have recently built the following circuit for (homodyne) differential detection of optical laser pulses. In fact, I rebuilt the circuit from this paper with small deviations:
simulate this circuit &...
- 61