A signal is a stream of information in the form of a varying quantity. Usually in electronics, signals can be in the form of voltages, currents, or radiated electromagnetic fields.

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2answers
85 views

Best way to count glass marbles

I've got a reason to count a number of marbles in a game. Up to about 100. I can feed them down a track one at a time. I can ensure that they each go down separately, although I can't accurately ...
-1
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2answers
88 views

Understanding alternating current (sine wave) [on hold]

I want to study the basics of propagating a periodic signal, i.e. sine waveform, which is a power signal. Let us consider an alternating current and write its expression as $$I(t) = I_m \sin(2\pi f ...
0
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0answers
30 views

Intel Integrated Audio Signal Path [migrated]

I have a Dell Latitude C840 laptop. It has Intel Integrated Audio. Intel 82801 CA/CAM AC'97 Audio Controller. It has been giving me problems. Sometimes I get chopped or truncated audio, or strange ...
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1answer
68 views

How tuning of particular FM signal is done?

I have a transistor radio which has facility to play FM radio channels between 88MHz to 108MHz frequencies. Now,consider a situation ,there are five FM stations which I can hear in my city ...
1
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1answer
86 views

How to amplify a very small signal

I am trying to wrap my mind around very small signals; what they mean, and how to amplify them. For example, here is a screenshot from my cell phone. Notice the signal level received is -97dBm. ...
0
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2answers
99 views

What are values of fundamental frequency and the harmonics for the below signal g(t)?

We know that a Fourier series formula for any signal $s(t)$ is given as $$\frac {a_0} 2 + \sum \limits _{m=1} ^\infty (a_m \cos \frac {2 \pi m t} T + b_m \sin \frac {2 \pi m t} T)$$ Here,as we see ...
2
votes
1answer
84 views

Signal on top of PWR line

See edits at bottom: I'm trying to design a network of circuits (see example below), in which a modular circuit (non-static, can be change, with high variability in current draw) is connected on any ...
0
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1answer
30 views

Usefulness of VBW in spectrum analyzer

Typically in the block scheme of a spectrum analyzer a video filter, with a bandwidth VBW, is located after the envelope detector and before the screen. As pointed out in this document, the VBW may ...
0
votes
1answer
53 views

Monitoring voltage state without interfering

I have a CO2 laser cutter, and I am designing as circuit to turn on some outlets whenever the laser is firing. The laser is turned on by a 5V logic connection to the high voltage power supply. If I ...
0
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0answers
18 views

ISE 14.7 fatal error problem

I am having fatal error problem in ISE 14.7. I checked out for this problem and got here: http://www.xilinx.com/support/answers/33423.html It says that this error can also occur if the simulator ...
0
votes
1answer
91 views

Transmission line: Why do longer traces cause signal reflections?

As the question says, I want to know why do longer traces/longer lengths of non-terminated signals of the PCB cause reflections and not the short length ones? I am ignoring the negligible amount of ...
0
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1answer
32 views

How to determine servo signal encoding

I have a TowerPro SG90 servo which matches the "JR" brand wiring discussed here where the servo's 3 wires are as follows: Red is + Black is ...
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3answers
96 views

Why signal is inverted in common emitter amplifier?

Why signal is inverted in a common emitter amplifier?
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1answer
52 views

Calculating attenuation of coax cable run

This question is related to my question about long-distance Ethernet. I discovered the Netsys NH-310C, a reasonably-priced device for converting Ethernet to coax for long-distance runs. The ...
0
votes
2answers
31 views

Explanation of the result of a solved exercise concerning the unit step response of a system

I came across a solved exercise regarding Signals and Systems in which there is a system with impulse response \$h(n)=u(n)\$ and input \$x(n)=u(n)\$. The goal was to find the output of that system ...
0
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0answers
30 views

Problem while linking flip flop D in VHDL

I have defined a single Dflipflop with the following code (and I suppose It works): ...
0
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1answer
30 views

Can signal arrival times be a function of receiver bandwidth?

Lets assume that the speed of light is exactly \$3\!\left(\!10^{8}\!\right)\text{meters}/\text{second}\$. Suppose we have a transmitter on the surface of the earth emitting a signal at 1000 MHz and ...
1
vote
1answer
37 views

Safe way to interface directly with HomePlug / Powerline

I'm looking to do some research into the actual messaging used by powerline adapters. I'm aware of the standards, but I'm specifically looking to see where real devices deviate from the standard, and ...
0
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0answers
25 views

What is a cheap way of isolating a large parallel plate capacitor from background fields

I am making liquid level detector that will rely on a change in capacitance to determine the changing heights of various solutions in a tube placed between two stainless steel plates(20cm x 12cm). I ...
-1
votes
1answer
87 views

Determining zeros and poles from an equation [closed]

I'm given an equation \$y(n) = a_0 {x(n)} + a_1 {x(n-1)} + a_2{x(n-2)}\$ which is used to design a simple filter to remove a narrowband disturbance with frequency \$F_0\$ = 70 Hz. I'm told to let the ...
2
votes
1answer
78 views

Questions on this high frequency sawtooth generator

So I found this very basic sawtooth generator: http://www.radiolocman.com/shem/schematics.html?di=143990 I have a few questions about it: I understand that when the capacitor C_T charges fully to ...
0
votes
1answer
36 views

Using an unconnected audio splitter degrades audio signal quality?

Consider that you have one of the following: These are used to connect 2 male audio connectors into only one female connection. Since I can't find, for now, where I have the audio cable extension, ...
3
votes
2answers
357 views

Obtain an accurate DC value in an AC+DC signal

Background: My goal is to use an Arduino with two proximity probe sensors to achieve some output. It is worth mentioning that the output of the proximity probe has two components: DC output that ...
0
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2answers
55 views

What makes an arbitrary waveform generator arbitrary?

Why are some signal or waveform generators called "Arbitrary Waveform Generators"? Am I misunderstanding the word arbitrary? This question is not necessarily about the word arbitrary but more about ...
2
votes
3answers
102 views

Measure human voice for ambient noise level

I need to develop an ambient noise level to measure the loduness in an office. Sometimes during the day people raise their voice more than they should and a lot of confusion is created. So this device ...
0
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1answer
52 views

Convert DC 0 to +1V signal to -1 to +1 signal

I need to convert a 0V to 1V measurement signal to -1 to +1 volt. What is the best way of achieving this? I've tried searching but can't seem to find anything relevant, as I'm not entirely sure what ...
2
votes
1answer
66 views

Sonar single transducer element SNR vs array SNR

Background: I'm taking a flexible learning unit on radar and sonar systems in a vocational college for an assoc. degree level course. The teacher has given us a reading assignment: "Chapter 15 ...
0
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1answer
131 views

Noise on TL074 / TL084 but not on LM324

I made a circuit that modifies a signal so it can be safely read by an ADC. I'm using an op amp to shift the signal +2.5V so I can measure AC. When I do this shift another signal appears. About 40mV ...
3
votes
1answer
89 views

Another motorcycle project: gear selection indicator [closed]

I have another little project that I have been thinking of making, but am having some trouble with the circuit design. In a nutshell, here is what I am envisioning: Objective: Create an electronic ...
0
votes
1answer
64 views

Help for VR sensor signal conditioning (variable reluctance signal conditioning)

im trying create a CDI/TCI unit for my Suzuki Bandit GSF400. i need some help for VR sensor signal conditioning section. this is the disc that generate the pulse signal. i have found this image ...
2
votes
2answers
62 views

Calculating Power of a Non-Continuous Signal

I have to find the power of the following signal and would like to know if I'm doing this right or, if I'm doing it wrong, how to do it. The equation for power in my textbook is \$\overline{m^2(t)} = ...
0
votes
2answers
45 views

Sending identification signal with IR or RF

Is there any way to build a device capable of sending an ID signal with IR or RF? For example, imagine I want my TV to know whose remote is being used (assuming everyone has a different remote). I ...
0
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0answers
38 views

Hack Quartz Clock Movement with Chronodot

I'm working on creating a clock design that will use an off the shelf Quartz Crystal Clock Movement. I know they are not all that accurate and was thinking of a way to make it more accurate. My ...
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0answers
51 views

Splitting Digital RGB Signal Line to multiple LED strips

I am trying to connect multiple strings of WS2812B RGB LEDs to the same signal line (so that they will all behave the same way, display the same colors, etc). The WS2812B is very time sensitive, so I ...
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0answers
21 views

Noise and raise in heat causes lose/no signal strength of my wireless internet USB

I'm 15-20Kms away from tower which is source of my signals. I have a Booster couple of months ago it was good enough to provide Strong Signals, As Summer comes the problem of raise in atmospheric ...
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votes
1answer
62 views

Which is the better way to send a broadcast signal to a great number of smarthphones in the same place? [closed]

I wonder which could be the better way to send a broadcast signal to a great number of smartphones in the same place at the same time? I'm thinking about 10.000 to 50.000 smartphones in an area of ...
8
votes
1answer
2k views

Why isn't the Fourier transform of a single sine wave cycle a single bar?

I have tried different Fourier transform codes out there on single sine waves, and all of them produce a distributed spectrum with a resonance at the signal frequency when they should theoretically ...
0
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1answer
27 views

Whether phase congruency and phase coherence terms are same or different?

I am studying the importance of phase in signal.Can anybody explain what is phase congruency ? Also,I am confused between terms i.e. phase congruency and phase coherence. Whether phase congruency and ...
0
votes
2answers
88 views

Why Doesn't This Op Amp Preamp Circuit Amplify?

I have the following circuit as part of a class D amplifier: simulate this circuit – Schematic created using CircuitLab I couldn't get the amplitude of Vsig to display, it is ~.447Vp, to ...
2
votes
3answers
503 views

How do signal reflections work?

How do reflections work, physically to the charge carriers level? Considering a square wave generator connected to a long, open cable, I've made a quick chronological diagram of the propagation of ...
0
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2answers
66 views

Reading a 1.2V-8.8V Signal into a 5V Arduino Input

An analog DC signal that ranges from 1.2V to 8.8V (from a thermocouple amplifier) is to be read from a input pin on the Arduino that reads 0V to 5V. Other that using a potential divider consisting of ...
0
votes
1answer
89 views

Trace vs Plane on Multi-Layer Board

Designing a 4-layer board (signal+pwr, gnd, signal+pwr, gnd), and I have some newbie doubts about the best option to connect different connector's pin or IC's pad to power lines, or sometimes to ...
0
votes
1answer
92 views

Test 220V 50 Hz signal using oscilloscope [duplicate]

Can I test a direct electric signal wave AC 220V 50 HZ using an oscilloscope in safe mode and the schema for this testing. The description in my oscilloscope say that the input AC pk and DC is Max ...
1
vote
3answers
85 views

Convert MP3 recording of data casette to serial data

I have a retro EMCO F1P CNC machine with a matching M1 controller that comes with mini data cassettes containing the "Machine State Data" which must be fed into registers of the controller before ...
0
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0answers
35 views

Reducing noise from an input using an FIR in VHDL

I have a non digital input I want to read in my VHDL file but it has sooo much noise that I would like to filter out using a digital filter that would sample the signal and allow pulse levels that ...
0
votes
0answers
24 views

Simulating noise in a digital signal

I'm trying to simulate a POTS line, and I have a reasonable set of digital filter coefficients sorted out. However, I'm a bit rusty on how I'd add a fixed amount of noise to match a given "SNR" of, ...
1
vote
1answer
102 views

What's the dwell signals?

Today When I was seeing this page(Digital multimeters (DMM or DVOM) part) I saw this part: What does "automotive timing"? and What's the dwell signals? are these electronic concepts?
5
votes
4answers
744 views

Audio signal trying to go back to zero zeroes

I created a two differrent signals on my android phone, one to act as the clock signal (lower signal), and the other to be the data signal (lower signal), but the problem is that the audio the signal ...
0
votes
0answers
17 views

PCM1865EVM as a bandpass filter

I recently started using the PCM1865EVM evaluation board from Texas Instruments.I am using it to process a signal. currently generated by a signal generator in future it will come from another device. ...
2
votes
3answers
137 views

Is there a Multiplex with X inputs to control X outputs?

I want to use a multiplex to controll my circuit. I just want something that can be a switch between an input and output. I thought to create this circuit: simulate this circuit – ...