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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408 views

Connecting balanced low impedance output with unbalanced high impedance input

I want to send the signal form my audio interface to the guitar pedal effect. I'll use interface's line out balanced output and plan to plug it in to the effect pedal which has high impedance ...
-1 votes
1 answer
45 views

What is minimal frequency to detect such signal? [closed]

I develop simple signal generator, to debug other devices. It sends high logic signal which has length approximately time length 64 microseconds. If i connect some device which has processor frequency,...
-2 votes
1 answer
56 views

Was there ever a protocol to send profanity censorship tones out-of-band over television, so that viewers could turn them off? If not, why not? [closed]

These days, in the Western world, closed captioning is delivered out-of-band, so the captions are not actually part of the video itself, allowing viewers to turn them off if they are not desired (...
0 votes
2 answers
141 views

Minimize Single Balanced Mixer Insertion Loss

I am self teaching RF via the internet, "Introduction to Radio Frequency Design" by Wes Hayward and the 2005 ARRL handbook. My intended project is a 1 stage IF heterodyne receiver. Not ...
1 vote
5 answers
178 views

How does a signal get amplified? [closed]

Say I send an analog electric signal through a telephone wire. If that wire is long enough then the resistance will eventually make the amplitude of the signal close to zero. How do electric signals ...
1 vote
1 answer
226 views

Problem with voltage-controlled current source circuit using op-amp with MOSFET at high frequencies

This is a circuit from Mr. Sourav Gupta: The problem is that I want to use this circuit to drive a current using voltage control which is a digital pulse signal in 1T, see picture below: I want to ...
1 vote
3 answers
248 views

How to make a differential measurement using two single-ended circuits that are high-z isolated?

Consider this system: There is an AC source that is differential w.r.t to ground. To measure this signal, I setup a diff-buffer and then feed the output to an ADC which measures the differential ...
-1 votes
0 answers
31 views

signal and systems I am looking for a source for sample question [closed]

Hello everyone! I need to work with this type of questions because of my school, but I could not find any resources on youtube or on the internet about the tutorials of this. Is there a youtube source ...
-1 votes
0 answers
46 views

Can 360 Step Down do Inverting voltage? [closed]

So I've been using LM2596 as my negative voltage reference, and now i'm looking for easy to find, super small, and cheap component that i can use to do inverting voltage. Is it possible to use this ...
0 votes
0 answers
23 views

I2C Buffer suggestion [closed]

My device has low driving strength of I2C signals , a0 I need an I2C buffer which strengthen weak signal coming from slave. Please suggest some IC which strengthen weak signals.
0 votes
1 answer
280 views

How do I send a signal from my computer to my USB antenna

I'm trying to make an RC car that can be controlled by my computer. The heart of the car is a simple mother board from an old toy. It basically accepts a signal 49MHz from a controller with a 9V ...
1 vote
2 answers
80 views

Proof that two systems are equivalent

I was wondering if someone could help me with the proper answer for this? Below is the question and my solution. I was hoping for partial points but I don't know what can be marked partially correct ...
2 votes
1 answer
74 views

How can I use MATLAB to show that the Doppler effect destroys orthogonality of OFDM subcarriers?

I am trying to get a visual representation of how the Doppler effect destroys the orthogonality of the subcarrier and understand this effect. I plotted three orthogonal subcarriers in MATLAB: ...
4 votes
2 answers
3k 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 ...
4 votes
2 answers
423 views

Suggestions for accelerometer signal conditioning

I want to use an ADXl326 accelerometer to measure vibration in one plane only. The accelerometer is fed with 3.3 V and returns 1.65 V at 0 g +/- 57 mV/g What I want to do is remove the 1.65 V bias to ...
0 votes
1 answer
248 views

Connecting a signal to a pin in Quartus

I want to connect a signal in a .v file to a top level pin assigned in the pin planner but I've no idea where to start. I've looked at several guides but as a C programmer this is all quite alien to ...
0 votes
0 answers
79 views

Adalm Pluto SDR - Second RX channel signal issues

I have a Pluto SDR rev c, on which I just enable the second TX and RX channel. I am sending a simple sinusoidal signal at a specific frequency (fc), but different phase and amplitude, using the two TX ...
0 votes
2 answers
388 views

Clock direction in MII and RMII Interface

I know that in the MII interface, the clock is always sent from PHY to MAC irrespective of TX or RX? Can someone explain me on why TX and RX, the PHY should send the clocks? Like for the RX ...
2 votes
2 answers
55 views

Processing data from optical chopper to correct for drift

I have a time series measurement of light intensity where the signal is periodically blocked by hardware to provide a moving baseline to correct for drift. This looks like a square wave, where the ...
1 vote
2 answers
31 views

Why does the volume of the preamplifier change when a second audio signal is mixed? [duplicate]

I have two audio signals leading to the amplifier input: the first one comes from the preamplifier, the second one from the audio output of a smartphone/tablet device. Both have a resistor and a ...
2 votes
3 answers
761 views

Splitting an input signal into two separate opamps?

I am designing a circuit that takes an incoming signal from a preamp and splits the signal into two shaping amplifiers to compare different amplifier settings (via the EL5163 opamps). I was wondering ...
2 votes
1 answer
660 views

STM32 encoder mode, CNT doesn't count

I'm using an STM32L476RT. I've got encoders based on a TLE4946-2K. I can't get it to work. I'm attaching my code and config below. I'm kind of stuck at this point. I tried to lower the voltage by ...
3 votes
1 answer
59 views

3x analog signal multiplier

I was looking for sin(x) in, sin(3x) out. I am aware of PLL, diode, and AD632 multipliers. Most are either squarers for sin(2x) or pure sine or amplitude multipliers. I saw the sin(a+b) identity and ...
0 votes
6 answers
17k views

Why is the signal inverted in a common emitter amplifier?

Why is the signal inverted in a common emitter amplifier?
1 vote
1 answer
336 views

Cable for MEMS Accelerometer

I am using a MEMS Accelerometer (ADXL1001), along with the EVAL board and an NI 9234 DAQ module to acquire the signal. I am using a RG58 coaxial cable to connect the sensor output (2 connector pins, ...
0 votes
5 answers
72 views

How to switch between two signals with a digital signal?

I have two different potentiometers. Each sets different voltage reference signal for a current source. How can I make an Arduino or any digital signal to switch between these two potentiometers? (No ...
0 votes
1 answer
303 views

What is faster than a relay?

I need to find something that is faster than a relay. What I'm trying to build is an electrosurgical generator for acollege project. I want to accomplish something like this: This was the reference I ...
-1 votes
2 answers
400 views

Graphical nature of signal energy

In signals, we learn that the energy of a signal is the integral of its square. E.g. \$E=\int_{-\infty}^\infty x^2(t) dt\$ We know that integrals are the areas under the function in a graph. But ...
0 votes
1 answer
89 views

Why do resistances disappear when studying variations of the voltage Va?

I'm trying to solve the question 2.2 of this sensor conditioning exercise. In the solution of the exercise, when trying to find Δ va, the teacher made the resistors R, and the continuous voltage ...
-1 votes
2 answers
2k views

SNR and attenuation question

I have the question above from random material and I tried to solve it. Here, I assume signal power to be S1(dB) and noise power to be N1(dB) at input, and S2(dB) and N2(dB) at output. So below is ...
0 votes
0 answers
38 views

Z transform and the magnitude of Fourier transform

Would like to know if the graph of the magnitude in the picture I added is correct. Should I address the other pole?
0 votes
1 answer
281 views

Phase-modulated Noise

If you replace the carrier signal in a phase modulated circuit with noise then presumably the noise will be modulated. What must be considered if we wish to detect this noise modulation? I’ve ...
-2 votes
4 answers
451 views

Recreate an inline 12 Volt Electronic Flasher unit for LED turn signals

I am trying to recreate the circuit for a TWO PIN 12 Volt Electronic Flasher unit for LED turn signals. It is the inline flasher "relay" that I need. Where power comes in the B (Battery) pin ...
0 votes
1 answer
217 views

LvPECL TX and LVDS RX

I have a quick sanity check question because it seems too good to be true. If I have a LvPECL signal that I want to receive, I can just use a LVDS receiver (422/485 specifically) right? From reading ...
0 votes
0 answers
22 views

Cold junction temperature measurement in Multichannel Thermocuple

In a multi-channel thermocuple signal conditioner (for example, 5 channels on a single PCB), should I add 5 separate junction temperature measurements to the thermocuple input of each channel to ...
1 vote
2 answers
69 views

24 VAC signal rectifier and detection

One of my projects consists of recovering a 24 VAC signal to give a run command. To avoid using a relay with a 24 VAC coil I would prefer to convert the 24 VAC signal into a DC signal and use an ...
0 votes
0 answers
40 views

Generating sine, triangle (etc) waves from ttl output of a GPS module (Ublox)

I'm building a variable frequency standard using a Ublox gps board off Ebay. It'll be hooked up to an Arduino and you enter the desired frequency via a keypad. The signal from the module is a square ...
4 votes
1 answer
221 views

What is the purpose of the op-amps connected back to back in a thermocouple signal conditioner?

I am trying to design a thermocouple signal conditioner. I came across this structure on the Analog Devices LTC2057 typical application page. Why was such a connection made instead of using a single ...
0 votes
1 answer
78 views

How can I trigger a 3V relay with no current, just a 3V signal?

Is it possible to trigger a 3V relay with a 3V signal voltage carrying no current? I want to be able to operate a 12V ebike lighting circuit via the brake lever which also operates the motor cut off ...
3 votes
1 answer
4k views

When are meanders necessary? and how to calculate timing differences

I've found that meanders are used for high speed traces like RAMs wires and are also used for coupled wires like in the usb. My question is, how I know when I should use meanders to keep track length ...
7 votes
3 answers
3k views

Why the resultant period of two signals is the LCM of the individual period of that signal? [closed]

Suppose a signal is constructed using two independent signals(say S1 and S2)both S1 and S2 have two different individual frequencies.The resultant signal that has been constructed has a new frequency,...
0 votes
1 answer
162 views

How to represent binary for differential and Manchester coding?

I have some questions with solution provided from random material, but I can't understand well. Question 1: I tried to represent binary for each block according to description in the picture above, ...
0 votes
1 answer
61 views

Connecting with a mobile phone over a 2-3 ft distance, and not beyond that

I have a device that I want to connect with a mobile phone at 2-4 ft, but not if the phone is further away than that. What signal or design can I use to accomplish that?
0 votes
2 answers
134 views

First LED in string of WS2813B LEDs glitching

I set up a string of 4 WS2813B LEDs, connected to a Raspberry Pi Pico microcontroller. It mostly seems to work, except the first LED shows these glitches: Sometimes the color just turns white instead ...
0 votes
2 answers
143 views

Why do some circuits work in LTspice, but not in Proteus?

Why do some circuits work in LTspice, but not in Proteus? I was playing with my amplifier circuits in LTspice by changing the values forth and back, I had calculated. I was thinking about a special ...
6 votes
3 answers
5k views

When is impedance matching necessary? Isn't it much less efficient on all other aspects?

I understand that discontinuities of the physical properties of conductors create reflections much like dioptres reflect a bit of light, but : in which cases does impedance matching become ...
0 votes
2 answers
282 views

How to calculate noise voltage after amplification?

I'm simulating the thermal noise experienced by some instrument, outputted as a voltage vs time plot. To calculate the "power" of this noise, I'm using: P = 4kTB (k = Boltzmann's constant, T ...
0 votes
0 answers
47 views

Signal Generator Output Impedance Matching and Floating Ground

I am attempting to recreate a signal generator circuit based on the XR2206, as seen in this video. The schematic uses op-amps for offset cancellation and output amplitude matching. To avoid the need ...
0 votes
4 answers
200 views

Why does 'Rfb' affect input impedance?

I am reading "Experimental Methods in RF Design" by Hayward, Campbell, and Larkin published by the ARRL. On the topic of feedback, see that two methods are presented. One method is emitter ...
2 votes
1 answer
205 views

Decoding Signals from an Unknown Port on Spectrometer

We have a Thermo-Nicolet Nexus 670 FT-IR Spectrophotometer, made in the USA around 2000. It was the work horse of the infrared spectroscopy community. The instrument sends out signals to a proprietary ...

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