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Questions tagged [emitter]

For questions about devices that emit electromagnetic radiation. Do *not* use for questions about the emitter terminal of a bipolar junction transistor -- in that case, use the "bjt" tag.

For questions about devices that emit electromagnetic radiation. Do not use for questions about the emitter terminal of a bipolar junction transistor -- in that case, use .

13 questions
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Transistor biasing without an emitter and collector resistor

I come across with a transistor circuit as shown below. What is the name for this circuit? Besides, what is the working principle of it?
user42423
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Can an LED be used as a receiver and as an emitter?

I have this idea but I do not know if it makes sense. The idea is to use a red transparent LED connected to an input of a microcontroller. In parallel it is also connected to an output of the same microcontroller. What I would like to do is detect…
sharkyenergy
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Detecting a location of the needle inside a cavity having multiple IR emitters , using IR Detector at the tip of the needle

I am working on a project where I need to find the location of a needle that has the IR detector at the tip of the needle. These needles are medical suturing needles that would help us to detect the position of the suturing needle while suturing.…
DevanshS
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40 kHz Emitter Frequency Response

I've recently purchased 40 kHz transceivers and I tested its frequency response in anechoic chamber using a B&K microphone located 90cm away from the emitter. The response provided in the datasheet is whereas my finding is What can be causing…
csg
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Why do I have a voltage over the detector even when the emitter is disconnected from the circuit?

I have built this for a school project exactly as per the schematic. The voltage measured across the detector resistor is 8 V. However, even with the emitter disconnected,the measured voltage is the same. The detector is a photodiode. Flipping the…
Richard Westmoreland
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Is there a faster alternative to the HT12E / HT12D IC?

I am looking for a quicker alternative to the HT12E encoder IC. This IC lets you encode 8 bits of adresse and 4 bits of data. Once the bits are encoded, it outputs a frame containing all those bits like so: My problem is that each frame is always…
Théo
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How measure the opening angle (integral rotation of a cone) in a emitter

I have an IR emitter (EMIRS200_AT01T_BR080_Series) with the datasheet showing the Optical output power versus the opening angle as below. Now, I would like to understand how interpretation the opening angle (integral rotation of a cone). Does 90°…
NicoCaldo
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Understanding Responsivity of an IR sensor paired with a black body IR emitter

I'm building an air quality measurement system with the following components: IR Dual Channel sensor by Pyreos Axetris IR Balck Body emitter Reading the sensor datasheet I've seen there's the Responsivity expressed as 150.000 V/W at 10 Hz. Now, I…
NicoCaldo
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How does a Black Body IR Emitter work?

I'm going to buy some IR sensors for gas detection measure. As soon as I need lights on specific waves length for measure specific gas, I have opted for a black body IR emitter, specifically this one I've understood that this type of emitter uses a…
NicoCaldo
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Infrared High Intensity LED with two anodes?

I got an infrared led emitter, with model ""L1I0-0850060000000" and the datasheet is plenty of technical data but I can`t find why it has three terminals - 2 anodes and 1 catode. Usually it's used for data transmittion. Datasheet:…
Ramiro Vargas
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Drive 433Mhz emitter and Attiny with two coin cells

I would like to detect when the postman put mail in my box, so I was thinking about a simple attiny with tilt sensor (which would wake up the attiny) and a 433 MHz emitter: The problem is that one cell coin (3V) is really low for this kind of…
bodtx
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IR emitter LED with jack 3.5

Currently I'm using an IR LED connected directly to a PCB where an Arduino UNO is connected. When I send a command with the Arduino, the LED sends what I want to an IR receiver. Now I'm thinking to change a bit this solution, because I want to…
João Amaro
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Are IR emitter frequencies adjustable? Can modulation of the emitter vary material absorption properties?

A common LED emitter, Gallium Arsenide, apparently has a wavelength of about 760 nm. Then on the receiving end, there is a filtering circuit to eliminate ambient IR and to demodulate the message. Can we modulate the IR emitter signal to obtain…
Bob Smith
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