Questions tagged [signal]

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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How does an XOR phase difference detector behave when input frequencies are different?

How does an XOR phase difference detector such as AD8302 behave when input frequencies are different? Does it give meaningful results when the frequencies are close but different? Is there a simple ...
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2answers
40 views

Increasing range of FM transmitter

What things impact to range of FM signal? If I increse length of antenna would signal range increase? I would like to increase the signal range of this project. Is that possible? Do I need more power ...
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1answer
43 views

when should I use a tuned amplifier circuit compared to a LCR bandpass circuit?

I am reading Microelectronic Circuits by Sedra and Smith. When should I use a tuned amplifier circuit compared to a LCR bandpass circuit? The text does not explain it well.
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38 views

Composite video from rear car camera - bad signal (wrong levels?)

I have bought a car radio (AMPrime 4022D) that has ability to connect rear camera to it, so you can see the image on its screen. The problem is that radio doesn't detect the signal (blue screen). But ...
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2answers
48 views

Voltage divider for a voltage range spanning negative voltages

We have a sensor giving out a signal between -10 V and +10 V, and a signal acqusition device that only accepts voltages between -2 V and +2 V. So we need to scale down the signal into the smaller ...
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2answers
42 views

Re: attenuating amplitude of a signal

I need to attenuate a signal which outputs from a function generator. The minimum amplitude of the signal from the function generator is 1mV. What would be the best method to attenuate the signal from ...
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1answer
52 views

110V AC to 3V AC for harmonic analysis

Looking for some general guidance on stepping down 110V Ac source for A/D conversion. I am interested in capturing some of the harmonics in the source for analysis. My worry about using a step down ...
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1answer
40 views

Op inverting amplefier circuit

i am using the LM741 amplefier i want to invert a negative voltage (-10V) to positive voltage (1V), my problem is : i dont get the 1v DC at the output. i get an ac signal at my oscilliscope. and i ...
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2answers
63 views

How can I create signal interference in a circuit?

I understand that this is counter intuitive but, as an experiment I want to create interference in a circuit. I want to expose an AC sinusoidal signal to a second sinusoidal signal. This will cause ...
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2answers
66 views

How to appropriately test Ethernet hardware?

How should I appropriately test the Ethernet of my device? I have some ideas: Measure signal integrity between the MCU and the PHY or Switch devices (like RMII) Measure the signal integrity of the ...
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1answer
79 views

Guitar pedal works by itself but not in a signal chain

I just built a clone of an LPB-1 pedal, as my first ever guitar pedal project. It works great between my guitar and amp with no other pedals in the chain. When it is placed in a chain with pedals ...
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1answer
65 views

Only detect the phase of a sinusoid multiplexed with other sinusoids of different frequencies

Is there an easy way to detect the phase of a sinusoid that has been added to other sinudoids of different frequencies (through a frequency-division scheme) without using a superheterodyne receiver ...
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0answers
35 views

Long tailed pair not working to compare signals from 2 LDRs

I've been trying to compare my signals from 2 LDRs to feed into Arduino's ADC. However I can not get any gain from my differential amplification. The problem comes when I have high resistance from 1 ...
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2answers
73 views

4 layer PCB, mixed signal, multiple different voltages

For a mixed signal PCB with DACs, ADCs, MCUs and multiple analog opamp circuits. With +/-15V to power the opamps, 3.3V for all the digital stuff and a couple reference voltage rails (1.5V and 3V). Can ...
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3answers
95 views

How does this surge protection work?

This circuit signals an MCU via OU lead. I am not interested in the MCU side. I just show the concept. My question is very simple: How does the surge protection(actually ı meant detection) part work? ...
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1answer
29 views

Designing signal conditioner to convert current source to voltage output

I've seen a lot of signal conditioners online for converting a 4-20 mA current loop signal to a 0-10 voltage output. However, they seem extremely expensive for the task they are achieving. Are the ...
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0answers
34 views

Ultra-low power energy harvesting wireless sensor network: technology and options

Background & Context I'm developing a project proposal for my honors thesis (officially commences at the end of July, running for one year) with the aim of designing a wireless sensor network with ...
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1answer
50 views

How to correctly calculate dBv using voltage sample points?

I'm working on a noise detection application and now I can read the Vout value of the MEMS microphone VM1010. By searching on the Internet, I find ...
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0answers
55 views

Build pass-stop filters

Can we build pass-stop filters using diodes? This is a quick design I came up with. simulate this circuit – Schematic created using CircuitLab Lets say in the first half-cycle D3 is forward ...
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1answer
52 views

Advice needed for a final year project on wheelchair automation and control

My project partners and I have been trying to design a wheelchair for people with neuro-degenerative diseases. I know this has been done in the past, however we are using a different approach. We are ...
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2answers
72 views

How to preserve signal power in a splitter?

I have a double Yagi antenna setup that I used successfully in the past, with both antenna connected directly to a 4G mobile broadband WiFi router, achieving 50-80 Mbps. The antenna have different ...
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4answers
78 views

Is building a long range wifi antenna to connect to the up and coming starlink internet possible? [closed]

I want to try to convert a residential satellite dish into a long range wifi antenna to theoretically see if I can connect to the up & coming starlink internet that is being released in Canada and ...
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1answer
63 views

What is the meaning of a circle next to a component pin?

I'm analyzing the schematics of Lenovo_G530_N500_-_COMPAL_LA-4212P_JIWA3_JIWA4_-_REV_1.0Sec. I have across scenarios where there is a circle next to a component pin....
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1answer
33 views

VU Meter with Dot/Bar display driver

I found this(link below) video on Youtube, it's a RGB stereo Vu meter based around (obsolete) LM3915 dot/bar display driver. Since author didn't provide schematics and I want to build something ...
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1answer
36 views

Bias T with pulse train

I want to bias my pulser output which is 0 to 30V pulse train. (Which means I want to make 30 to 60V pulses) First, I used a bias T with 30V DC input: I found that it works as a differentiator which ...
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2answers
45 views

Resonant frequency and maximum signal width

I've seen resonant frequency being defined as the point where the input signal is in phase with the output signal (So reactance/susceptance is 0). However conceptually, teaching material seems to link ...
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1answer
85 views

Maximum power transfer of transformer [closed]

We have this transformer: simulate this circuit – Schematic created using CircuitLab The power transfered to R1 resistor is maximized when the frequency of the signal is very big.This means ...
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1answer
53 views

Creating a 1PPS signal froma a 10 MHz CMOS Output Signal

Is it possible to "create" a 1PPS signal using an Agilent 8165A signal generator? We currently don't have a way of testing a 1PPS signal directly, so we're looking at "making our own&...
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1answer
124 views

Ultra wide band

I am working with an ultra wide band device (DWM1001 dev board) and I was wondering how does a UWB connection work? How do you connect one device to another through ultra wide band? I know that there ...
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2answers
98 views

Do two active high signals cancel each other?

A tp4056's temp pin is pulled HIGH, so it disables the chip. I accidentally fed a high signal into that same pin and it enabled the chip again!, which has to mean the signal went LOW. Are these two ...
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1answer
70 views

Fourier transform of an integral

I am preparing for an exam. I found this problem : I am trying to use the properties then use a pre-transformed function from the table but I couldn't find one. I saw a solution on web : I think he ...
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1answer
78 views

Analog 0…10V signal splitting

I've been trying to solve a problem, but a few days of searching has yielded nothing, and I'm inexperienced to create my own electronic circuit. First, let me explain the problem. We use data acquired ...
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1answer
35 views

Calculate length of a trace that has a fork in it?

If a trace has a fork in it where it goes in both directions how do you measure the length? Do you count the lengths of both ends of the fork? Asking because I am considering using a switch IC to ...
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0answers
26 views

Filtering Options for an RTL-SDR (DSP and Analog routes)

I have several related questions regarding filtering for an RTL-SDR radio. It's readily swamped by the very, very strong AM and FM radio stations local to me. So much so that your basic passive RC ...
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0answers
42 views

Voltage rating of 3.5mm jack audio output

I am building an audio amplifier using TDA2030. I want to know what is voltage (RMS or peak-peak) rating of typical audio output from 3.5mm jack. I am doing a simulation in Proteus, and I am having ...
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1answer
37 views

How to convert any periodic signal to a square wave signal using the Schmitt Trigger?

I had to make a kind of frequency meter, and what made me stuck was the signal formatting. I couldn’t build a circuit containing the Schmitt Trigger, which will allow me to convert any periodic signal ...
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0answers
18 views

How to determine SNR required for adding AWGN noise to clean IQ samples?

I'm doing an experiment w.r.t PSD output. I have generated some 11a IQ samples and checking its PSD output in MATLAB using pwelch and comparing with the PSD output obtained using hardware. Here are ...
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0answers
43 views

clipper question with non-ideal diodes

Vo for the clipper circuit where Vi = 10sin (6280t) and diodes are 0.6 volts. I think the simple form of the circuit is like this. if we don't calculate the resistors. Could the output signal be ...
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1answer
26 views

Equivalent baseband communication channel

I was reading on my lecture slides (I do not put them here since they are not in English) this statement about equivalent baseband channel models: In typical wireless applications, communication ...
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0answers
17 views

Accelerometer signal to audio signal

I have a accelerometer (ILS - MPU9250) and a woojer vest. The woojer vest is a device that shakes based on audio input. (simple line in with jack) What I would like to do, is to put this ...
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2answers
94 views

Low pass filter to remove noise from signal

I am working with an inductive proximity sensor. In the ideal condition, it gives 5V as a high signal when metal is sensed and gives 0 as a low signal when metal is not in proximity. But due to ...
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5answers
125 views

Why frequency of a DC signal is chosen as zero? If the period can be anything, isn't it same for frequency?

This is a page from Oppenheim. We can assume a DC signal as a repetition of 10 strips per 10 seconds/10 strips per 5 seconds. Like that, if we choose different periods, we get different frequencies ...
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2answers
55 views

Fast method to calc th Fourier transform

exist a fast method to calc the Fourier trasform (in both sense, t -> f and f->t)? When I use the table and the properties of the Fourier transform, sometime I have difficult to calc this... Any help ...
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3answers
87 views

How can thermal electrical noise be uncorrelated yet appearing at a certain frequency?

Say we look at the thermal noise spectrum of an ideal resistor. Now we know it will behave like $$ \langle U^2 \rangle = 4 \, k_B \, T \,R \,\Delta f $$ We also know that two subsequent voltages ...
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2answers
94 views

Resistor / Capacitor on digital signal

I'm new quite new at electronics and trying to learn small tricks too. In some schematics, I saw they're adding resistors or capacitors on the signal. 1) For example please check U1's 13th leg at ...
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1answer
46 views

How to tell whether a line coding scheme has DC component or not

I'm new to EE, trying to understand things as a non technical audience. My textbook says one of bipolar encoding schemes called alternate mark inversion (AMI) has no DC component and we can think ...
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2answers
51 views

Does NRZ-I have a synchronization problem?

I'm new to EE, just have a question on synchronization. I was reading a book which says: NRZ-I has no problem with sequences of 1s, but has problem with sequences of 0s. It certainly has a ...
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2answers
141 views

How to calculate Doppler Shift for multipaths from moving objects?

Let's say we have a radar where the transmitter and receiver are placed together, and form an angle theta with a target object moving with velocity ...
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2answers
28 views

A question about antenna gain and signal property

I have an antenna with a somewhat constant gain "X dBi (theta, phi)" in the frequency range of interest. With this antenna we receive a radio signal with an amplitude of "Y Volt (t)". The signal is ...
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4answers
3k views

What is causing this distortion of a pulse wave when recorded to a reel-to-reel tape?

I'm currently trying to record a pulse train used as a tempo clock for music instruments (e.g. output of Korg Volca 'sync out') onto my Fostex M-8 reel-to-reel recorder, with the aims to then ...

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