Questions tagged [detector]

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Idea needed to design spike detection

In our electrical workshop, they gave us to design a spike detection telling that later on we will be given a eeg signal as input to our circuit, so we had basic idea that first need to pass it ...
white shadow's user avatar
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0 answers
32 views

How to calculate the maximum measure level on the spectrum analyser?

Suppose that all individual spectrum lines in the range from 1 MHz to 2 MHz have the same level of 40 dBuV. The distance between the spectrum lines is 35 kHz. Measurements were performed using a peak ...
HAPU's user avatar
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2 votes
2 answers
93 views

Potential issues with an alternative charge amplifier op-amp circuit?

Sorry in advance for a long question. I'm working on designing some pre-amplifiers to amplify signals from a Multi-Wire Proportional Chamber for a nuclear physics experiment. Each signal from these ...
Migue's user avatar
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1 vote
1 answer
208 views

EMC Radiated Emissions, peak vs quasi-peak

This is regarding some Radiated Emissions testing unintentional radiator: Critical frequency is at 314.986 MHz Polarization is Horizontal Peak detector is 53 dBμV/m Quasi-Peak detector is 56.68 ...
Dimitar Zhekov's user avatar
6 votes
4 answers
864 views

Doubt about the capacitor in a equivalent circuit (ion chambers)

I'm delving into the topic of ionization chambers, but as someone without a background in electrical engineering, I'm finding the equivalent circuits a bit challenging to comprehend. Specifically, I'm ...
SimoBartz's user avatar
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1 answer
166 views

Metal detector coil wire gauge [duplicate]

Many designs of metal detector coils use different gauges of wire for the TX and RX coils - why is that? Does the wire thickness influence other parameters rather then just the resistance and current ...
ron vais's user avatar
1 vote
1 answer
66 views

On the understanding of signals from an IR detector coupled to a lock in amplifier

I have a CW laser which is modulated by an optical chopper rotating at 1kHz. The modulated CW beam struck a sample holder and the absorption signal is recorder via an Infrared Associates MCT detector. ...
Strelok's user avatar
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1 vote
1 answer
112 views

UHF envelope detection circuit simulation in LTspice

I am trying to make an envelope detector for an OOK signal, but my comparator is not working properly. I tried various models for the comparator but for some reason the output is staying relatively ...
Pessentrau Optiarou's user avatar
9 votes
8 answers
1k views

How does an emitter follower work as an AM detector?

Can someone explain how an emitter follower used as an AM detector (shown below) actually works? I don't get how a (theoretically) linear system like an emitter follower would work as a detector when ...
kene02's user avatar
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0 answers
72 views

Help with circuit for school

I am doing a project for school with two friends. We are going to make a DIY metal detector. We are using a source as our circuit. Can someone help us describe what is happening in the circuit?
Mattiz Ketels's user avatar
0 votes
1 answer
80 views

Crystal detector power measurement and SWR measurement - How are they related?

I'm researching the application and behavior of crystal detectors, like the HP 423B. I understand the core principle of a detector: extraction of the 'video' signal that is amplitude modulated on top ...
Tom Verbeure's user avatar
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1 answer
172 views

Electric shock detector

I am a software engineer and totally new in electric field so that this question may be silly. Can we develop a device that would turn on an LED on or make sound when the holding person gets shocked ...
Peter Lee's user avatar
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3 votes
2 answers
196 views

First time designing an SR latch; I'm using it to control the enable pin on my eFuse IC. Just want to know if I'm overlooking anything

I just finished designing my rectifier module that has a built-in voltage monitor IC and an eFuse IC. Its purpose is to convert the 3-phase AC output from my wind turbine and use it to power my USB ...
soconnoriv's user avatar
0 votes
2 answers
707 views

Peak detector circuit for AC RMS value

The peak detector circuit based on a precision rectifier with buffer allows to obtain the peak value. The RMS value in an AC circuit is obtained from: RMS = V peak / sqrt (2) = V peak * 0.7071 AC ...
philfs's user avatar
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0 votes
1 answer
90 views

What is the purpose of VD2 in this circuit?

This is a simple sonar device using piezoelectric mic and speaker. I understand, the C2-VD1-VD2-C3 is detector circuit that is intended to enable the sound generator based on CD4001 that produces ...
Jimmy Falcon's user avatar
0 votes
2 answers
116 views

LNA and DC amplification

In a THz detector, it produces a DC output voltage proportional to the input signal intensity. I need high SNR. My doubts are: Can I use LNA as a preamplifier? Is DC amplification possible with LNA? ...
prashanth's user avatar
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0 votes
1 answer
239 views

DC offset cancellation

I am working on THz detector and was going through research papers. In the receiver stage a preamplifier is used in the circuit shown below. Why can't we directly use the amplifier? How does the dummy ...
prashanth's user avatar
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0 votes
1 answer
161 views

What am I doing wrong with metal detector coil?

I saw on the internet a lot of people making metal detectors so I was thinking of building my own. I took 35 turns of 0.5 mm wire over a 20 cm diameter air core, connected it to a function generator (-...
Ron Vaisman's user avatar
0 votes
1 answer
171 views

Building a metal detector to detect 3mm particles

I am trying to build metal detector to detect some stainless steel and copper and iron particles with size approximately 2~3 mm embedded on circular food product. Its diameter about 2 cm and width ...
Ahmed Tharwat's user avatar
4 votes
1 answer
691 views

Metal detector vs ground penetrating radar (GPR) frequencies

I was reading about metal detectors and at first got thinking they use lower frequencies because of ground/rock losses. Low frequencies will penetrate better, but seeing GPRs penetrating much deeper ...
Ron Vaisman's user avatar
0 votes
1 answer
206 views

Electromagnetic induction metal detection circuit

I am trying to develop a metal detector for use in a minesweeper competition. I aim to use a coil based metal detector because it has a long range and can detect underground metals. There was a ...
Mora's user avatar
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1 answer
325 views

Photodiode arrays: how can different wavelengths be compared?

In DAD (diode array detector), aka PDA (photodiode array) detectors, the light is dispersed and different wavelengths fall onto different diodes. This allows finding out which wavelengths were present ...
Stanislav Bashkyrtsev's user avatar
1 vote
0 answers
202 views

Low intensity UV light detector

I wanted to build low light UV detector, I mean the measurement of light with wavelength 405 nm. I found two schemes: First circuit: And the second circuit: I wanted to use operational amplifier ...
Malum Wolfram's user avatar
0 votes
1 answer
32 views

Counting rotations of plastic and metal plate

I have a thin (~1-2mm) rotating plate, where one side is made of metal and one side is made of red plastic and I want to count the number of rotations it makes. The plastic and metal plate are housed ...
Actros's user avatar
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1 vote
1 answer
29 views

Looking for a simple circuit to switch power to IR LED's at night (2A @ 12 volts)

I'm looking for a simple and cheap way to switch power to a few hi-current IR led's at night. So some sort of photo detector and a solid-state or traditional relay. Unless there's a single-component ...
Peggy Schafer's user avatar
0 votes
2 answers
275 views

Turn signal detector

I'm trying to figure out the simplest design possible. I want a video camera to activate on my truck when I activate either left or right turn signal. Each side mirror has its own camera. So basically ...
unklemanny87's user avatar
0 votes
2 answers
299 views

Peak/envelope detector circuit for 30 MHz sine pulses with a 10 kHz PRF

My goal is to input 30MHz sine pulses, with a pulse width of 10us and gap of 90us between the pulses. The circuit should convert this pulse train to a TTL signal that goes from 0 to 5 volts. To ...
Lucjoh's user avatar
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0 votes
2 answers
152 views

Is this circuit measuring the electrical field?

I have found the following circuit on the web (https://electroclinica.org/2018/03/23/fabricacion-de-un-sencillo-medidor-de-campo-de-rf-diy/) which claims to be an "RF field" detector/meter/...
78dtat78da's user avatar
0 votes
0 answers
45 views

How to add more lights and sirens to motion detector

I have a motion detector size of a cigarette box that rings bell or simple song when activated using a small remote control. We turn it on after closing the business to go home. We've had many ...
McJoo's user avatar
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1 vote
2 answers
214 views

HF Peak detector

This is a peak detector taken from page 21 of the opamp ADA4610: I need it to capture peaks from 500KHz sine wave. I can't understand why when the sine starts it goes above the peak and then ...
kristian_'s user avatar
0 votes
1 answer
101 views

Novice looking for help with a current sensor circuit

I'm an electronics novice trying to figure out how to detect when current is flowing to certain tools in my shop so I can add some automation to my dust collection system. I essentially want to build ...
Steve933's user avatar
-1 votes
2 answers
1k views

Gain of photodetectors

I found this in a lecture about "Optical Wireless Communications." It is slide 15. Does anyone have idea how gain was computed?
Anna Koroleva's user avatar
0 votes
2 answers
508 views

Antenna for contactless 50/60Hz AC detector

Many simple circuits can be found online for building an AC detector that look something like the circuit below. These are simple devices to e.g detect AC lines in your walls. They feature a short ...
flawr's user avatar
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0 votes
3 answers
764 views

Balance metal detector sensitivity for smaller pieces of metal

As suggested by Andy in these posts proximity sensor technology, range of 150mm, Metal detector "Head sensor" and How can I drive an LC tank circuit to get a nice and clean sine wave?, I ...
Rushabh's user avatar
0 votes
2 answers
629 views

AC current detector / sensor without splitting wires

I saw this question about measuring AC current without splitting wires. I understand why this is difficult and inherently imprecise. Is it, however, easy to just detect whether an appliance is on or ...
DennisFrett's user avatar
-1 votes
1 answer
656 views

Simulate a double balanced coil for a metal detector on PROTEUS

I am trying to build a metal detector with double balanced coil, (the scheme source is the french magazine : L'ELECTRONIC POUR TOUS project: EN1465 Un détecteur de métaux très sensible, the magazine ...
user137684's user avatar
10 votes
6 answers
2k views

A few questions on PIRs and other motion detectors

I grew up incorrectly believing that motion detectors (as part of burglar alarm systems) were designed to detect movement, when in actual fact it is the movement of a heated (like body heat) object ...
questioner's user avatar
0 votes
1 answer
522 views

Circuit to detect only one zero crossing when a sine wave changes from negative to positive half cycle

In a Grid Tie Inverter design, I need a circuit which can detect only one zero crossing of the Grid signal, (when the signal will change from negative to positive half cycle). I have made a circuit, ...
Kamranmu's user avatar
1 vote
1 answer
87 views

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 ...
DevanshS's user avatar
0 votes
1 answer
141 views

Microwave detection circuit verification

I want to develop a circuit which can detect electromagnetic waves (radio wave, microwaves.) This circuit will just act as a tamper detect and not physically measure/compute the radiation. I have ...
Pralay Panchwate's user avatar
0 votes
1 answer
978 views

Metal detector circuit description

I found a circuit for this metal detector and would like to make PCB. I can not find anything about this circuit. Maybe someone would know what this circuit is. What are the best component housings to ...
n0804's user avatar
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0 votes
2 answers
2k views

Why are alkalines "required" for metal detectors?

A handheld metal detector specifies only "Alkaline" batteries and not "heavy duty" or "rechargeable". Since there are li-ion 9v batteries available not at low cost I was ...
NoBugs's user avatar
  • 263
0 votes
1 answer
73 views

Designing a Light/Dark Sensor with LDR 555 alternator LED and Motor

I am working on a project which I need to turn on LED alternately as well as motor turned on while it is dark. I managed to create an Electric circuit which can turn on the LEDs together. However ...
Rakesh's user avatar
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0 votes
0 answers
37 views

Feed-through termination to vary bandwidth and signal power

I'm currently facing an interesting problem regarding RC low-pass filters. In my experimental setup, I have a reverse-biased photodetector (DET01CFC from Thorlabs). To amplify this signal, I make use ...
Sandro Camenzind's user avatar
0 votes
1 answer
115 views

Is this a demodulated signal?

1st attempt I have a problem. I built the FM demodulator circuit, but i am not sure if this signal is demodulated. This was my first attempt which following an answer, resulted in a 2nd attempt ...
Chuckyy's user avatar
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1 vote
1 answer
374 views

How to balance antiphase Rx coil in metal detector?

In this question How can I drive an LC tank circuit to get a nice and clean sine wave? I learned to get clean oscillation waves of a tank circuit (Tx) and consequently its reception through antiphase ...
maijaz99's user avatar
2 votes
4 answers
1k views

How can I drive an LC tank circuit to get a nice and clean sine wave?

As advised by Andy in this post, I constructed single loop transmit and receive coils: I use this circuit to transmit a powerful field: The Tx signal has a large spike that is reflected in the Rx ...
maijaz99's user avatar
0 votes
1 answer
398 views

Linear regulator power consumption

I have this circuit linear regulator with UVLO so I would like to calculate the power consumption of this block any person can help me, please Vout = 1.5 V (Iss = 15.2 μA, Vout = 1.5 V, switching = 32....
cheniour oussama's user avatar
1 vote
1 answer
1k views

Envelope detector RC values [closed]

I have understood how the envelope detector works, but I am unable to find the formula for R and C appropriate values. The closest I have found is this link: Explain The Square Law Demodulation and ...
The Force Awakens's user avatar
0 votes
0 answers
29 views

Maximizing signal to noise ratio for very small radiation detector

I have a very small radiation detector that outputs signal of small amplitude. Requires preamplification before going to an actual amplifier. When constructing the system prior to the preamp, would I ...
Jake's user avatar
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