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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14 views

Control valve logic

I have this control valve which has an input control signal 0f 0..10V. Normally this means that at 0V the valve is completely closed and when the signal is 10V the valve is completely open. I found a ...
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27 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 ...
0
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26 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 ...
0
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0answers
18 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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1answer
54 views

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

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
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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
14 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
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2answers
69 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
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3answers
455 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
46 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
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1answer
67 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 ...
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0answers
14 views

Pole and Zero to Filter type

How can we determine the filter type from transfer function? For example: alfa = 0.9 TF = c1 (1/Z-alfa)
0
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1answer
70 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
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3answers
56 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
26 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
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0answers
23 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
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1answer
85 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
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4answers
731 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
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0answers
16 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
116 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 – ...
0
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0answers
44 views

Peak and leakage current detector

Hello I am trying to make peak and leakage detector for LCD shutter. I have specific parameters known : Voltage from 5V to 12V bipolar square wave. Testing is at 60hz Peak current ~30mA leakage ...
1
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1answer
53 views

Folding of a two signals

I have the following problem: according to my exercise text I have to calculate a signal in the frequency domain. I found out that I could use a the folding rule for time-discrete LTI systems and have ...
0
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1answer
38 views

shifting ac signal

I have an AC signal that is in the range of 1.5v-6.5v and it needs to pass through a buffer with a single supply of 6v to ground. So in this case, it needs to be shifted down by about 0.5v so that ...
5
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7answers
830 views

Is the meaning of a Decibel different when applied to Voltage vs Watts?

If I have an amplifier that provides +3dB, or an attenuator that provides -20dB, then how do I know if that applies to Voltage or power? In other words, if I have a 0dBV signal and I run it though a ...
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0answers
29 views

Waterfall diagram for car starting coil signal/interference

Does anyone have a waterfall diagram for the signal given off by an ignition coil when a car starts (or is operating)?
2
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1answer
40 views

HDD read head signal

I read that hard disk read heads use "giant magnetoresistance" so I assumed that I could measure a resistance change in the presence of a magnet. Unfortunately I failed. The read head came from a 3 ...
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1answer
80 views

Multiplexing analog signal

I want to read 4 analog signals (coming from 4 pH sensor, generally said 16HZ freq.) With one buffer op-amp circuit going into a single ADC channel. Is it possible to achieve this using analog MUX ...
3
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3answers
182 views

Where to put low-pass filter on the analog signal path?

I want to test my basic pH sensor circuit to find if there is a need for a low-pass filter. How I can test it? The signal pathway is: Sensor probe---> Buffer op-amp circuit ---> ADC ---> MCU So is ...
0
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0answers
5 views

How to add Marker (Event) to a bitstream file in Agielnt MXG Signal Generator?

Using an Agilent N5182B MXG Vector Signal Generator in the Dual ARB mode I am able to create, download and play a baseband waveform with the samples' marker #1 set, and sensed via the ...
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2answers
94 views

What is difference between Power-GND vs Pre-GND?

I would like to know the difference between different types of Grounds like Power-GND vs Pre-GND. Are all the grounds not same? Cant we connect the device to any one of these grounds? In my ...
0
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1answer
43 views

Enery and power when we have trigonometric functions (Fourier transform)

It is asked to evaluate the energy and power of the signal $$x(t)=10\cos(100t+30°)-5\sin(220t-50°)$$ Since it is periodic, I need to find $$\int _{-\infty}^\infty |x(t)|^2 dt \text{ and } ...
0
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1answer
67 views

can signal ground be carried in the connector shell?

I have a cable with 6 pins but I have 6 signals and I don't have space for the signal ground. If the shell is continuous from end to end, would it be fine to use that as the signal ground?
2
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1answer
103 views

Must this switch be turned on and off periodically?

Imagine that the AC1-2 is 170VAC at 150kHz~. I simply want to turn the MOSFETs on, and let the AC flow through a inductive-capacitive load. 1) If I can turn the MOSFETs on to saturation by ...
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1answer
99 views

Simple Power Line Communication

I'm working on a remote (wirless) door opener and I need to install a device (just in the opener) at the entrance of a building where there is an electric opener. The problem is i can not install ...
0
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1answer
40 views

noise signal passed thru Normal ( Gaussian Random variable) distribution system : exam problem?

I know that Fx(x)= F((x+a)/o) I don't know how to find Fx(x) that satisfy the p(y>=0) can someone clear this point to me ?!!
0
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1answer
39 views

signal generator - circularly polarised

I am testing some hardware in lab that computes the four Stokes parameters. To test the hardware, I want to generate circularly polarised sine wave. Provided the frequency is high enough (above ~100 ...
0
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2answers
95 views

Looking for a simple way to inject a signal on 60Hz Mains line

Okay, so I'd like to be able to inject a really simple signal on top of the 60Hz AC Mains. It doesn't have to contain any data per se, just a simple signal to trigger a receiver on the same ...
0
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2answers
81 views

Change AC signal frequency without changing the voltage

I have a non constant -/+1 Volts to -/+7 Volts AC audio signal. I want to design a device that takes this input signal, doubles the frequency, without changing the voltage. So, the output voltage is ...
0
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3answers
109 views

Calculating the power of a signal

I'm trying to calculate the power of a signal and my tutor has given me this formula to do it. I've spent the past while building a program and now the foundations are there it's time to implement the ...
0
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2answers
61 views

how to determine the probability the two signals are equivalent

I am new to electronic engineering and DSP. I have this orignal signal matrix [X1,Y1] . . . . [Xn,Yn] and then it goes through series of transformation. It can be rotation/shift_bit/or whatever ...
0
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1answer
85 views

Proof: A strictly bandlimited signal must also be a signal of infinite time duration [duplicate]

How can I show that a bandlimited signal is also of infinite time duration? I know it has to do with Fourier transforms and convolution but I'm not sure how to actually prove it. I also know that the ...
1
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1answer
52 views

Detect the maximum of signal

I am trying to create a bloc with Xilinx system generator to detect the maximum of a sine wave. I used the strategy that: $$ x(n-1)-x(n-2)>0$$ and $$ x(n)-x(n-1)<0 $$ but I didn't find the ...
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3answers
127 views

How safely to send signal between logic and higher current pcb?

I'm designing a PCB with 4 FETs. These are driven in the same board by totem pole drivers, and their load are about 5A total. I am using PWM at 1000Hz. The signal comes from a logic IC in another ...
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1answer
64 views

lower and upper 3dB frequency from frequency response in Matlab

Is there any Matlab code available to find the lower and upper 3db frequency of a plot. If not what could be the easy way. I am aware of the theory but implementing is becoming difficult.
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1answer
49 views

Just need to check if this equation correspond to this block diagram

$$y(n)=y(n-1)-ax(n-1)$$ Is this correct? Thanks in advance.
0
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3answers
64 views

Is a multiplexed signal same as a composite signal?

Used to StackOverflow, this is my first question here. So please bear with me if the question is too simple and obvious to you as I am not good in Electrical Engineering stuff. I really need to ...
2
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1answer
79 views

Create a differential output signal

I need to supply the galvo driver with a signal "Voltage Range ±3.0V p-p or ±10.0V p-p (Differential Input)" - that's what it says in the datasheet. I have a 0-5V single ended DAC and differential ...
0
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1answer
86 views

Using a envelope detector to demodulate low voltage signal

I am currently working on a project in which I have a modulated RF signal at a carrier frequency of 400kHz. The signal itself is fairly low voltage, and I need to extract it from the RF carrier. I was ...
0
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0answers
88 views

How do Dualshock 4 pressure sensitive buttons work?

I'm doing a reverse engineering research about the PlayStation 4 controller. I want to know how do the analog buttons work (the triggers in the bottom, not the analog sticks). I've found a nice ...
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2answers
77 views

Does a regular signal booster with antenna work for cell phone?

I am not that much familiar with communication and antennas. I want to build a gsm repeater (gsm signal booster), but I am not sure if it works if I do it like the way we do for a radio. What I am ...