Questions tagged [optoelectronics]
Components, circuits, or systems that convert between electrical and optical (light) energy.
18
questions
39
votes
6answers
55k views
How do I model an LED with SPICE?
What diode modifiers are used in practice to model LEDs with SPICE (Berkeley v.3f5)? These are available to me:
...
1
vote
1answer
146 views
How can I test a TLP582 optocoupler?
Have few of these components (TLP582) and I need to design a test circuit to test its functionality.
Datasheet of TLP582
I have no idea how to make a circuit for this.
What should I be testing in an ...
2
votes
2answers
415 views
Detecting state of LED to control another circuit
I need to add functions to equipment I am not allowed to modify in any way. To do this I need to monitor the status of a Yellow/Amber LED and translate its status into a signal that can be used to ...
0
votes
1answer
169 views
Is it possible to model a PIN InGasAS photodiode in a SPICE simulator?
I want to know if it is possible to model a InGasAs panchromatic PIN photodiode, in accord with datasheet, in simulator SPICE MicroCAP 12. Because the supplier doesn't provide a SPICE model. And if it ...
8
votes
3answers
10k views
Using a LED to transmit data
I am curious about the possibilities offered by LEDs to transmit data over a short range (2 or 3 meters), and what maximum data transmission rate can be expected from carefully chosen, but consumer-...
1
vote
2answers
7k views
Current modulator for laser driver?
For a project, I like to feed a sine wave to laser, this sine wave must have a DC value of 2V and it should oscillate between 2.5 and 1.5V at 100KHz. The current required is <50mA.
What is the ...
1
vote
3answers
3k 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 ...
5
votes
5answers
14k views
Using an Opto-Isolator to detect 120VAC on a Microcontroller
I am designing a system where I need to know whether or not 120VAC is present on a specific wire.
The system is in line with a fuel pump system, and I need to check to see whether or not the pump is ...
1
vote
3answers
207 views
LED Matrix Leakage LEDs
I'm doing a LED matrix design and it's a cathode row design. Attached is a picture of my matrix design.
The design works ok and I can show any pattern in the matrix.
The problem is when a leak LED ...
3
votes
3answers
149 views
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?
3
votes
2answers
5k views
Stepper motor phase
I have a question related to stepper motors.
What does the "phase" of a stepper motor mean? I mean when we say that a stepper motor is a 2 phase stepper motor or a 4 phase stepper motor, what does it ...
1
vote
1answer
911 views
how to make a system respond to IR laser? [closed]
Lets say i have 2 separate systems called Box A and Box B. Box A has an IR laser beam attached to it.
What equipment can i use to make Box A make a certain action ONLY when the IR laser attached to ...
1
vote
1answer
394 views
What does “off-state output terminal voltage” in optocouplers mean?
I was looking at possible options of what optocouplers to use in my project. I was looking at these parts.
https://www.fairchildsemi.com/search/?searchText=MOC3023-M#N=&&Nao=0&&Ntk=...
0
votes
2answers
3k 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 ...
0
votes
1answer
2k views
high speed optocoupler circuit
I have 4n35 optocouplers, I am using these to isolate a motor driver circuit and the Arduino controlling it. I put one on the slave select pin and one on the tx line to the motor controller (there is ...
0
votes
2answers
121 views
Better resolution with photodiode (LTR-536AD)
I want to build something like a fog-sensor.
I'm using a laser and on the other end (~20m) I have a LTR-536AD photodiode. I hooked the photodiode to an arduino and was monitoring the voltage.
My ...
0
votes
2answers
164 views
Trouble changing an optocoupler without changing circuit functionality.
As a part of a circuit an optocoupler was driving the gate of a MOSFET as follows:
Now I need to change the above opto with a 4N46 darlington one.
I'm not familiar with these much and having ...
-1
votes
1answer
92 views
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 ...
