Questions tagged [photodiode]

A photodiode converts light to an electric current.

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86 views

Photodiode to opamp

I need to detect if a monomode fiber loop is intact. To that end, I have a laser diode emitting max 10 mW (adjustable) at 1310 nm. At the receiving end, there is a matched photodiode (Laserscom.com ...
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34 views

Is the charge accumulation linear in time for image sensors?

Reformulating the question: Does the rate of charge of the pixels photodiodes in an image sensor depends of the previous accumulated charge? The pixel sensor integrates light during a specific ...
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Transimpedance Amplifier and Photodiode for BFSK

I am working on my first transimpedence amplifier circuit and am having some trouble. I have am looking to reconstruct a BFSK signal modulated on an LED. The BFSK signal uses a 50kHz sine wave at 80mA ...
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82 views

Does this high-bandwidth transimpedance amplifier ring (Multisim)?

I designed a front-end for the S5972 high-speed photodiode. See the following schematic. In Multisim an AC sweep analysis gives the following Bode plot: 1. Is the presented front-end stable? If not, ...
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76 views

Infrared Sensor for drug detection [closed]

I saw that there has been a push to make a drug detector that can identify cannabis since it has been legalized. I was looking at mouser.com and found this ir sensor: https://www.mouser.com/...
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48 views

Photodiode not working in reverse bias

I'm using a photodiode module, model: coaxial InGaAs, Gtel. I set it in reverse bias with 5V and tested it with a laser but it doesn't give any output voltage. Unfortunately I don't know the laser ...
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51 views

Nor gate using photodiodes and transistors doesn't work correctly

I'm creating a circuit for a robot to avoid obstacles. It is created without using any ICs. When the robot meets an obstacle the LED (at the right side of the transistors) should be off because of ...
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72 views

Phototransistor amplifier

In the following picture: I have screenshotted a picture of the front end of a phototransistor receiver circuit from Electronic Gadgets for the Evil Genius. It appears to be a phototransistor-based ...
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2answers
55 views

Big photovoltaic current

A photovoltaic cell is just a photodiode connected to a resistor.Now if simulate this circuit – Schematic created using CircuitLab I put many photodiodes in series , this would create a bigger ...
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2answers
36 views

How to design a transimpedance amplifier that can adjust to large voltage swings?

I am making a photodiode sensor based on one show in the image below which I got from this research article. The problem I run into with my photodiode sensor is that variations in sunlight create ...
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56 views

How can I increase the distance of a photodiode

simulate this circuit – Schematic created using CircuitLab I wanted to make a fire detection system using a photodiode, comparator with potentiometer to adjust sensitivity, and an alarm circuit ...
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Photovoltaic cell creation

In order to create a photovoltaic cell all I need is a photodiode connected parallel to a capacitor right?
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67 views

Introducing SiPM Array to an Op-Amp

I'm working on a transimpedance amplifier circuit, but it appears that there are issues reading out a signal. The source is comprised of sixteen individual SiPMs in parallel with each other, ...
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1answer
57 views

mV difference not detected by LM741 opamp comparator

I've made this comparator circuit, it has a changing current going through the photodiode and when lighting changes sufficiently it should trigger a 5V signal at the opamp output terminal. When the ...
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1answer
67 views

OpAmp resistor to ground in feedback loop

I am currently tasked with improving the design of an electrometer unit. It was NOT designed by an electrical, and there are some questionable design practices. My question is concerning the first ...
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1answer
45 views

Transimpedance Amplifier for Photodiode with low Shunt-Resistance

I am designing a transimpedance amplifier to amplify the signal of a photodiode. I plan to use the IC ADA4350 (datasheet), it contains an Op-Amp and analog switches to select different feedback paths ...
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1answer
46 views

Convert a Dusk-to-dawn outlet device to Dawn-To-Dusk? [closed]

I recently purchased a Dusk-to-dawn outlet sensor (https://www.amazon.com/dp/B00002NB2X?ref_=pe_2640190_261118450_302_E_DDE_dt_1), but I'm wanting to convert this thing into a Dawn-to-Dusk device ...
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Read BPW21R photodiode

I want to sample the output of a BPW21R photodiode Datasheet. I intend to use an Arduino. If the resolution is not good enough for the Arduino analog input pin (A0) Arduino Tutorial then I want to ...
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1answer
63 views

Help identifying a photodiode pre-amp PCB

Recently I found this PCB in a electronics junk bin. It's said that it's a photodiode preamp, but I was not able to find the datasheet or any information about the board. Since the PCB looks neatly ...
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1answer
39 views

How to connect/use BPRV2125AM?

We want to know how exactly do we make the connections of the photodetector since they are so fragile.Can we do a PCB, and if so is there any IC base for it.How do we work the RF output as we need to ...
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2answers
56 views

Hand contacting op amp photodiode circuit causes interference - what ist the physic behind it?

I am new to analogue electronics and I am still learning about op-amps. I use the most common circuit for amplifying a photodiode's signal to measure it with an ADC: Amplification gain is 1M, the ...
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5answers
74 views

LED and Photodiode Data Acquirement System

So I am to develop a project this semester and wanted to be shed some light on certain topics. The goal of the project is the following: Detect a pendulum's period using an LED and a photodiode and it ...
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Total thermal noise of a photodetector connected to a spectrum analyzer

I connected a photodetector to a spectrum analyzer (SA) and observed the signal (i.e. noise) on the SA when there is no light hitting the detector. I noticed that when I set a low spectral resolution ...
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2answers
44 views

Transimpedance AMP, Active HPF, phototdiode (updated)

The original post is here Transimpedance AMP, Active HPF, phototransistor I decided to change back to a photodiode instead of a phototransistor since I have used one for a similar experiment in the ...
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1answer
56 views

Photodiodes: the “generation” mechanism behind photocurrent

Assume I use a photodiode under zero-bias (that is in photovoltaic mode). How/why can a current flow in this bias condition? As far as I have understood the working principle of photodiodes, when ...
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Transimpedance AMP, Active HPF, phototransistor

So this is the part where I would like the phototransistor (TEMT6000X01) to be able to clearly capture an LED with a frequency flashing on and off at 1kHz. So what I have here is a transimpedance ...
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142 views

I have made a photodiode circuit and measured using multimeter - still no change in voltage. What to do? [closed]

My photodiode is MTPD1346D-100 (InGaAs PIN photodiode.) What is the photodiode input voltage? This is my circuit schematic:
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Photon count with ADC, am I doing it right?

I have this LED and I want to characterize this photodiode. The LED should produce light of 370 nm, but I measured it and it is around 358 nm, and at that wavelength the quantum efficiency (\$\eta\$) ...
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2answers
135 views

Simple Op Amp Non-inverting Amplifier Circuit Not Working

I am only just starting to learn about circuits and electricity, so please bare with me. I am attempting to build the circuit pictured below: And this is my rendition of it: Here are the parts used:...
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63 views

Monitoring 32 photodiodes simultaneously (all mounted on a flat surface)

I'm a total newbie here. I do not know much about circuits. So sorry for the newbie question and Thanks for helping! What I want to do is to detect position of incident light on this surface. For ...
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75 views

Switching multiple photodiode inputs to an op amp

I am playing around with LEDs as (semi)wavelength selective photodetectors and have reproduced the circuit found in Forest Mims' Make article: I have an operational circuit using an LM358 powered by ...
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1answer
112 views

Photodiode to an ADC

Please bear with me as I'm not too experienced with this. I'm attempting to use an ADC to get readings from a photodiode. From what I understand, I should likely use an op-amp as the range of the ...
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5answers
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Thin wall to block LED light from hitting photodiode?

I'm designing a small heart rate sensor using green smd LEDs and a photodiode. The photodiode needs to measure the reflected light, and not direct light from the LEDs. The LEDs are near the perimeter ...
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19 views

How are solar spectra simulators used and are they used to test photo-diodes and image sensors?

For example here is link to a Xenon lamp solar spectra simulator Xenon lamp AAA Class Solar Simulator. Two spectra are shown in the plot given in the link, one for the AM1.5G reference an other of ...
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1answer
107 views

Photodiode showing triangle waves instead of square? (re: need op amp?)

I'm trying to visualize an infrared signal using a IR receiver diode but my oscilloscope is showing triangle waves instead of square for the carrier frequency: One of the guys at EEVblog said I need ...
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The connector circuitory for APD connection with simulating systems

I have an 230-8 series avalanche photodetector which is to be fed with high reverse bias. What mediator circuit will be required to get the signal onto my system on LabView platform? Where can I buy ...
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1answer
129 views

Using an IR diode as an emitter and receiver?

At the recent Maker Faire Berlin, I was told that LEDs can be repurposed as photo diodes. I assume the same is true in the infrared range. This sounds like a nice solution for building a transmitter. ...
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104 views

PIN Photodiode gamma detection amplifier circuit - rectangular wave output

I've been working on a project recently, where I need to build a device which detects gamma radiation and can be used for gamma spectroscopy. I've done some research and found many interesting ways of ...
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45 views

Troubleshooting op-amp circuit and compactor for buzzer

I tried building a radiation detector (cheap photodiode Geiger counter) on perfboard: http://opengeiger.de/StuttgarterGeigerleThruHole_en.pdf More details here. With the circuit was turned on, ...
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19 views

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 ...
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87 views

Epoxy Resin Molded vs Hermetically Sealed Metal Can Packaging for LEDs and Photodiodes

Between epoxy resin molded vs hermetically sealed metal can packaging for photodiodes and LEDs are there any relevant functional differences I should be aware of when selecting between otherwise ...
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A Simple Model to caculate the Ionization Coefficient from the Avalanche Gain M

I got measured Data of the Avalanche Gain M (in dependence of the Electric Field E) of a APD. Is there a simple way to model the ionization coefficients a and b for electrons and holes? I know that ...
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Understanding basic photoresistor circuit

I'm new to electronics, so I just can't wrap my head around how this photoresistor circuit works. I understand the following: the photodiode can be understood as a variable resistor (i.e. works in ...
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2answers
53 views

What bias voltage is applied to a PIN photodiode when connected only to multimeter

If I take just a PIN photodiode (e.g. BPW34 FAS ) and connect a multimeter to its terminals to measure current, for example: expose the photodiode to the sunlight and read current of ~1 mA on the ...
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184 views

Irradiance sensor circuit

Im trying to measure the irradiance from the sun using the following TIA circuit: I'm using a BPW34 photodiode due to the good spectral range and for being cheap. Also the datasheet provides a ...
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1answer
62 views

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-...
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71 views

What is the relationship between dark current and the contribution of dark noise in a photodiode?

For example, if I have a datasheet for a photodiode that lists a dark current of 1000nA. I have a transimpedance amplifier with 1kohm transimpedance and 1 mV voltage output voltage noise. Presumably ...
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91 views

How to filter out certain wavelengths of light [closed]

I am trying to filter out certain wavelengths of light and I was wondering if there is a way that you can filter them out. I am using Silicon Photomultipliers (Linked below) and I only want to detect ...
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73 views

Photodiode to detect light

For a university purpose I am preparing a project, actually I am thinking of using a photodiode in reverse bias in order to measure intensity of light. I divided this project in some phases: 1) ...
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285 views

Photodiode - circuit questions

I am a bit confused on a few things regarding photodiodes. Here are two circuits that I am referring to: or   For the second circuit the capacitor is not of importance. Here are my fundamental ...