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Questions tagged [frequency]

How many times something happens per second, measured in Hz (Hertz).

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Choosing a position sensor (encoder) and obtaining velocity from it

How do I know how many counts per revolution I need for an encoder for my application? I need to be able to accurately capture a 1000 Hz signal on an input side running from 1-133 rev/sec (60-8000 ...
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1answer
24 views

THINNET 10BASE2 Network using RG-58 Coaxial Cable operating frequecy?

I am trying to figure out what the signal frequency of a 10BASE2 network is. Specifically the frequency of the signal being carried over coaxial cable. Data transfer is 10Mbps and the network adapters ...
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1answer
78 views

What determines the frequency of network cable

You have Cat6, 23 AWG, rated for 250Mhz frequency. You then have Cat6a, 23 AWG, rated for 500Mhz. Both are unshielded. How is Cat6a able to transmit data at a higher frequency then its counter part? ...
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2answers
95 views

How to find the source of a noise in a particular band

The problem: The ADSL2+ service at home is not performing up to its potential. The modem is supposed to sync at 16 Mbps (downstream) but the it does only up to 11.5 Mbps. Using the diagnostic tools ...
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radio wave propagation: MUF and plasma frequency

I have doubts after the reading the page. I know that wave propagation is possible only if wave frequency is bigger then plasma frequency. But in this article in description box of the picture is ...
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2answers
86 views

Using 120 VAC 60 Hz battery charger with 50 Hz AC [closed]

I live in Australia (220-240 VAC, 50 Hz mains). On a recent trip to the United States (110-120 VAC, 60 Hz mains), I purchased some battery-powered tools that came with a charger. The charger has this ...
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55 views

Time to Frequency Transform - Where are the Initial Conditions?

In a circuit with sinusoidal source and charged capacitors and inductors we have initial conditions: $$u_{C}=u(0)+\frac{1}{C} \int_{t_{0}}^{t}i(\tau)d\tau$$ $$i_{L}=i(0)+\frac{1}{L} \int_{t_{0}}^{t}...
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38 views

Voltage Equation in Time Domain

When we describe a AC signal (voltage is this case) in time domain we use an equation something like this below: \$v(t) = V_m \mathrm{sin}(\omega 𝑡 + \phi)\$, where 𝜔 is the angular frequency of ...
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1answer
29 views

Generating square wave using NXP LPC1768?

I am reading a book that teaches about programming the LPC1768. I have the following exercise here: Using any digital output pin, write a program which outputs a square wave, by switching the output ...
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43 views

There exists 110v/60Hz motors as well 220/50Hz ac motors rating, what determines the voltage of an electric motor?

I have seen the Toms question and answers for what determines the voltage of an electric motor? None of the answers not fulfilling. I was not able to comment to get clarify my doubt, so I’m posting ...
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Estimate electrical frequency from clock shift

About 6 months ago I installed a solar power system with 2 Tesla Powerwalls for backup. Today, we got to test out the system with a power outage from an ice storm in the southeast. (We are still on ...
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Can I use the oscillation frequency equation for this circuit?

I'm not really sure if this is a question that can be answered so I'm sorry in advance if it isn't. I've just started doing electronics on a breadboard and I'm making a "Mini Strobe Light" from Jaycar'...
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1answer
35 views

Detection of Acoustic signals

There is a scenario: There is a certain box which emits acoustic signals at 30kHz and you are trying to detect these signals using some sort of detector. I was wondering, would it be more efficient ...
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1answer
93 views

Need some help designing a mains frequency converter (220v/50hz input, 220v/60hz output) for <$200USD

My main limitations here are with the amount of power needed, and of course the price. What I'm trying to do is to run a clothing dryer from the USA in another country, without burning out the drum ...
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4answers
536 views

Use audio frequency to light up multiple LEDs

Need some help here - I need to light up about 20 different LEDs based on the frequency input(200 Hz-20,000 Hz) Eg: The circuit should light up the 1'st LED when the input frequency is between ...
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31 views

Choosing an inductor for a bias T

I'm creating a Bias-T circuit for a certain application. When choosing my inductor to block my AC-signals I know for example the proper inductance to choose etc. However, what I am having trouble with ...
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1answer
67 views

From which circuit, I will be able to measure high frequency signal (in MHz) by using micro controller with 200 Ksps ADC?

I want to measure 20 MHz signal by using microcontroller with 12 bit ADC And 200 Ksps sampling rate. Which circuit should I design in order to measure it accurately?
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1answer
49 views

Ultrasonic transducer actual bandwidth for filtering

I have a pair of ultrasonic transducers with a "Thick Resonant frequency" of 975 kHz ±30kHz according to the data sheet. I did a frequency sweep test where I could see that they performed best at a ...
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1answer
53 views

Resistor's behaviour at high frequencies

Looking at the impedance vs. frequency graph 1) At low-frequencies Z=R and hence it would be a straight line. 2) For mid-frequencies, Z decreases possibly due to capacitance, but I'm not sure ...
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2answers
48 views

Passive Elements At high Frequency [parasitic effects]

What would the magnitude Response curve for a Resistor, Inductor and Capacitor look like [with parasitic effects not ideal components] ? From what I have gathered they would look something along the ...
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6answers
180 views

How do I set my speakers out of phase?

A little bit of context: I'm doing a project for my physics class where I could choose the topic, and I chose to do phases in sound and noise cancellation (wavelengths and frequencies). Essentially, ...
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1answer
78 views

Generating a realistic sine wave in MATLAB

I'm working on a simulation on MATLAB and I need a realistic sine wave which has harmonics. So I know there would be harmonics at 2f,3f... but I am not sure how to determine their amplitude. I tried ...
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1answer
54 views

How do we get the complex frequency of an exponentially damped sinusoidal function?

In my textbook, Engineering Circuit Analysis 8.Ed by William H. Hayt (Chapter 14, Section 14.1 page 536) I stumbled across a section explaining the complex frequency. The goal is to cover the concept ...
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51 views

mechanical excitation of tuning fork and electrical readout

For my experiment, I am trying to mechanically excite a quartz crystal tuning fork and measure the voltage across the tuning fork. When the TF is driven at its resonance frequency, there should be ...
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1answer
43 views

Electronicaly switching parallel LC circuit components

Let's say I have mentioned circuit and I want to be able enable/disable one of the 1uF capacitors to change the frequency of the LC circuit. I would like to do this electronically with a micro-...
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1answer
51 views

Very slow turn-on time BJT (BUV27)

I have been asked to select a replacement BJT for a resonant circuit which uses the now obsolete BUV27. I have selected some based on V(CE) and hFE but all selected types perform a lot worse (low ...
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2answers
51 views

Maximum Clock Input Frequency Datasheet Confusion

I was looking for an 8-bit parallel to serial shift register to use in a project I am making. Initially, I thought that the 4021 would work perfectly for what I need, however, after looking at the ...
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2answers
59 views

Do poles enhance frequency or cause it to dip

I'm a bit confused about the idea of poles. In some of my courses such as digital signal processing, we are taught that in filter design, you place a pole at a frequency you want to enhance and a zero ...
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2answers
58 views

Frequencies in atmega (uC)

I want to use an atmega328p with nrf24l01 + wireless module and communicate it with an arduino nano with nrf24l01 +. My question is this, if I use different frequencies in the microcontrollers, will ...
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1answer
46 views

Home electrical transmission question [closed]

AC current is sine wave with 60 hz frequency - how is this helpful in understanding electricity and transmission? Does the sine wave progress through electric wire or stands static and oscillates? ...
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1answer
47 views

How Does Line Frequency Affect Coils of a Contactor?

I am using a generator as my source voltage, which produces 240VAC @ 240Hz. I was planning to use the following contactor from TE: CONTACTOR 4PST 40A 240V In the datasheet it says this contactor's ...
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1answer
57 views

i can't find the resonant frequency in a rlc circuit

I have an exercise where I have to find the resonant frequency but the equation can't be solve. What happen in those cases? It is possible to say that te RCL circuit does not have a resonant ...
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1answer
43 views

Frequency response of the waveguide

So, I have signal in the waveguide that is transmitted by two modes of radiation, for which the delay is for example \$\tau_1=6\,\text{ns},\, \tau_2=6.5\,\text{ns}\$, respectively. And the energy ...
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4answers
689 views

Relationship between I2C drawn energy / power consumption and data rate

Referring to just what the I2C lines draw, am I wrong thinking that the higher the clock frequency the shorter the time there will be (the same amount of) current flowing through the pullups and thus ...
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1answer
38 views

Hall sensor for slowly varying magnetic fields

I am trying to measure the change in the field of a permanent magnet (at about 50 mT) due to temperature fluctuations at room temperature (timescale ~ mins to hours). The sensor I am currently using ...
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1answer
38 views

Dynamic range given the THD [Spectrum Analyzer]

Imagine that I have to measure the THD with an error less than 6%, given the first 40 harmonics. How do I know the dynamic range of the spectrum analyzer that I have to use?
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1answer
75 views

RF layout bend over Component

We lay out the RF trace for below model. GSM 900MHz RF trace maintain at 50Ω impedance. As I know, the RF trace needs to be as short as possible for better signal. Do we need to bend RF trace ...
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1answer
42 views

Increase rotational velocity of synchronous motor

I recently got my hands on a Philips PM8110 (a single pen recorder which is basically an analog printer for voltages) which sadly provides paper with a velocity of 8 cm/hour. Although this would ...
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1answer
54 views

Frequency-to-Voltage convertor diagram questions

I'm relatively new to electronics, but I'm interested in making the Frequency-to-Voltage convertor linked here as part of a larger project linked here. Here is a diagram of the circuit I want to make:...
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3answers
1k views

Difference between internal and external oscillator for a microcontroller?

I am a beginner with respect to microcontrollers, so I just want to ask is there two option for choosing the frequency of the microcontroller: to be internal or external? If there is internal ...
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0answers
36 views

System requirement in frequency domain

Hi Can any one help understanding and interpreting figure 6a and 6b (page 6) in the paper attached down bellow : I need to identify first the transfer function of each plot and then interpret system ...
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2answers
145 views

How is it possible to ever have frequency on a DC circuit?

Preface Please read this carefully. I put a lot of time into it and am genuinely attempting to understand. I've read numerous articles about DC and AC circuits and searched numerous places to get ...
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1answer
47 views

Question on the right PWM frequency for Permanent Magnet DC Motors

I know that there are some posts in this site about this question. I don't know if there's a way to find out the "ideal" PWM frequency for motor control. Usually they recommend to be safe in a range ...
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0answers
47 views

Digitally selectable filter for the ST7580 [duplicate]

For the ST7580, it uses PSK or FSK to send a signal over power lines. In the design guide the example is designed for an FSK or PSK signal to be transmitted at 80 kHz see page 23 for reference to the ...
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1answer
47 views

Datasheet Notation for Filter Parameters

I've been reading through the LTC1264-High Speed Quad Universal Filter Building Block datasheet but I'm having some trouble deciphering the meaning of some of the variables used in the equations for ...
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1answer
84 views

Maximum switching frequency

Is it possible to calculate maximum switching frequency of IGBT having only datasheet in hands? https://www.semikron.com/dl/service-support/downloads/download/semikron-datasheet-skm200gal173d-...
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2answers
91 views

A question about SPI flash operating frequency

I'm working on a flash chip "W25Q128BV". I get really confused on the operating frequency of this chip. As we can see, "Read Data" instruction is comprised of 3 steps for master: sending opcode, ...
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1answer
44 views

De-rating / Re-rating criteria/theory for frequency in circuit breakers

I'm trying to spec a circuit breaker for a system that will be performing in the 3kHz range, and am not finding much info on how to calculate a new rating based on frequencies in this range (where ...
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82 views

Rubidium standard mystery output?

I've been playing with a frequency counter (Racal 2202R) that has a built-in rubidium standard. It has two outputs, "Rb OUT 1" and "Rb OUT 2". I could not find any documentation at all, but the ...
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1answer
92 views

Can someone explain how frequency and inductance affects this pair of coupled inductors?

I am simulating this simple circuit on PSIM; a single-phase AC voltage source connected to the primary of a pair of coupled inductors, with a 12 Ohms load on the secondary side. I want to increase the ...