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Questions tagged [frequency]

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

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Clock frequency in data path [on hold]

The figure shows a data path containing three latches. ∆x = 10ns, ∆y = 25ns and ∆Z = 12ns. What parameter limit the clock frequency? What is the maximum clock frequency? EDIT: I have tried finding ...
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1answer
38 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
31 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
41 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
173 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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2answers
52 views

Discrete transmittance - magnitude response calculation [closed]

Is it possible to calculate magnitude response \$ |H(e^{j\omega})| \$ when the only information I have is my function x (signal): \$ x=1+\sin(2\pi f_1t)+\cos(2\pi f_2 t) \$ (this is probably an ...
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1answer
72 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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47 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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How to calculate upper 3dB frequency of a closed-loop amplifier given open loop frequency pole?

How do I find the upper 3dB frequency given the transfer function and pole? I understand that the 3dB frequency is when the power drops by half, but I don't know how to find the pole for that point.
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47 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
37 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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Frequency response: Response Graph, Gain calculations and other

1) Let's say that the frequency of the capacitor here was so low tending to zero such that the impedance for it 1/jwc would tend to infinity. Hence now this would act like an open circuit and so ...
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1answer
46 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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81 views

Is there a hidden RF trick here?

I have been looking at the PCB images at this url: A look inside the N1201SA with the aim of getting a better understanding how this device works. The thing that I do not understand is that this ...
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2answers
31 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
56 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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61 views

How could using an op-amp on the output increase the frequency of an electronic oscillator?

I am trying to send an input from a 5 MHz Colpitt oscillator through an op-amp configured as a 10x gain buffer. We are connecting the collector node of a common base Colpitts electronic oscillator (...
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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
45 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
34 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
49 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
41 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
656 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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31 views

Alternator speed control

We are restoring a water mill and have recently got our 2 wheels turning once more. One of them is connected to an existing 3phase 10KVa alternator. We anticipate a potential issue with the amount of ...
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1answer
35 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
33 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
62 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
41 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
51 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
138 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
44 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
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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
42 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
64 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
62 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
35 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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0answers
75 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
90 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 ...
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4answers
2k views

Just how accurate is the frequency of US Wall Outlets? [duplicate]

I have a submersible pump for which I'm trying to determine the variability in flow rate, to high precision. Since this is just an impeller driven by an AC motor, what is the % error in frequency of a ...
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3answers
59 views

Apart from speed, do VSD's also alter current?

As I know it, a VSD alters the frequency to change the speed of a motor. I also understand that since the back emf of the rotor is directly proportional to the speed of the rotor, the slower the motor ...
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2answers
47 views

Overclocking an image sensor for higher FPS

What happens if I overclock an image sensor? For instance the OV7670 (datasheet) which has a rated maximum system clock input (XCLK) of 24 MHz and maximum pixel clock (PCLK) of again 24 MHz. The ...
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2answers
61 views

Is 240V to 24V DC PSU to 120V 60Hz inverter a low cost way to convert 240V 50Hz to 120V 60Hz?

I've been looking at the companies providing step down frequency changing units in the 2000W range, and their enormous size seems to be reflected in an equally enormous price. SO...why can't I just ...
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2answers
37 views

Capturing and replicating IR signals, how to tell frequencies?

I want to capture and replicate IR signals of various electronics. There are various guides out there. However, I realize that there are various carrier frequencies, which I dont see discussed. How ...
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2answers
76 views

How can I convert a pulsed signal to an analog voltage?

I would like to measure the speed of a DC motor using a phototransistor and get as an output a voltage which varies linearly with frequency. The motor speed can vary from 0 to say 3000 RPM. Using the ...
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1answer
22 views

Is it okay to run a Mercury Vapor Lamp of lower wattage (100/150/175W) on a 400W MHL/MVL ballast? Also can a 60Hz ballast be used in 50Hz?

So, I have this RAB BMHH400PSQ Metal Halide Pulse Start Ballast 400W ,M135/M155 MULTI TAP 120-277V with me. Since the MVL are being phased out it has become quite difficult to get a ballast for one of ...
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2answers
58 views

Do I need to consider RF power splitters for signal <1kHz?

I need to tap a signal on a BNC cord to record it with a Labjack ADC. The signal is very low frequency, as the FFT shows. I was planning on using an RF power splitter to add a line to the Labjack. ...
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1answer
39 views

Are these two ways of doing equivalent?

I have two signals sampled at, say, 256 Hz. I want to make the difference between these two signals and downsample them, say until 32 Hz. Is it rigourously the same (in term of final result) to make ...
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2answers
97 views

Calculating the frequency of data lines?

I read a calculation about determining the bandwidth of USB https://www.edn.com/electronics-blogs/all-aboard-/4425691/Rule-of-Thumb--2--Signal-bandwidth-from-clock-frequency Roughly what was said is: ...