All Questions
Tagged with optoelectronics infrared
13 questions
0
votes
2
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228
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How to understand output of TSOP4838 IR receiver?
I am testing the output of the following basic IR transmitter/receiver circuits and not getting the result I thought I would.
simulate this circuit – Schematic created using CircuitLab
I have ...
- 169
0
votes
0
answers
45
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Quad IR pickup output inconsistencies
I've designed a quad IR pickup for a stringed instrument. The pickup works well, except that the output level of each string is different. Some strings (particularly the left two channels in the ...
- 1
0
votes
1
answer
59
views
Gate-Souce resistors needed?
I completed an IR emitter circuit with two selectable power settings. It's working on the breadboard and I'm asking if I need the gate-source resistors for stability? As the circuit is battery powered ...
- 43
3
votes
8
answers
4k
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Reflect IR beam off reflector instead of emitting straight to TSOP receiver
I have a working set-up to detect beam breaks using an IR LED, modulated at 36kHz, and a TSOP receiver connected to a comparator. It outputs the count via Arduino. The range is about the width of a ...
- 151
0
votes
1
answer
39
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Relation for the current generated by a photo-diode in photo-conductive mode
If a photodiode with responsivity R is operated in photo-conductive mode with
reverse bias voltage Vb and load resistance Rld what relation gives the output current from the photo-diode flowing ...
- 37
1
vote
1
answer
621
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Photodiode current vs. irradiance and finding upper limit current
1.) What equation could be used to calculate, or make a decent estimate
of the current produced by a photo-diode from incident irradiance and its operating parameters. For example for this PIN photo-...
- 37
0
votes
1
answer
575
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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
2
votes
3
answers
2k
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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
9
votes
1
answer
4k
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Why do Infrared LEDs come with different coloured lenses?
I'm just starting a project to build a universal Engineer's Remote Control Unit [EG. able to send the Panasonic 0xF2 code, etc.].
I have seen that IR LEDs come with (at least) three distinctly ...
- 151
2
votes
1
answer
594
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IR receiver part interchange
I've got an old stereo that doesn't have a remote control. There was a model that did, and after looking at the service manual it looks like I just need to populate a PCB with an IR receiver to add ...
- 23
3
votes
2
answers
5k
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Point-to-point range measurement using an IR receiver
I am interested in using an IR receiver (as opposed to a standalone PIN photodiode or phototransistor) to measure distance/range. I thought I had found an appropriate match in Vishay's TSSP4P38 mid-...
- 73
0
votes
1
answer
1k
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Wrist-based Pulse Oximeter
I'm quite new to EE. I'm trying to design a wrist-based Pulse Oximeter. I have looked through a lot of literature and short listed these:
PhD thesis using 6 LEDs
A Single-Chip Pulsoximeter Design ...
- 125
1
vote
2
answers
681
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Cheapest way to do an IR re-transmitter (IR protocol agnostic, dumb device is good enough)
Looking out for ways to retransmit IR, bi-directionally, like this:
...
- 3,544