# Questions tagged [frequency]

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

996 questions
51 views

### Bode diagram calculating for random frequency

The max Gain of an opamp is 100dB (=100000). I have a cutting frequency at 10 Hz and then the slope of my bode diagram decrease by -20dB/dec . I have unity gain at 1MHz. For 100 Hz its increasing by ...
213 views

### How do I calculate limit frequency of the attenuator circuit?

Calculate the limit frequency $fg$ of the attenuation $v_u =\frac{ u_a} { u_e}$ at the current source I (for the value given in example), so that for $f>> fg$ exist ideal behavior. Note: ...
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### LTspice Monte Carlo analysis vs. .meas command

I designed some analog second-order all-pass filter in LTspice and provided Monte Carlo analysis as well. I want to evaluate the obtained AC results with .meas command, particularly: Magnitude ...
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### Finding DAC's Maximum Output frequency [closed]

How can I calculate the maximum output frequency from SPI interfaced DACs? Consider following example chips AD5362/AD5363.
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### FIR Filter Transition Coefficient

Design a length L=40 linear-phase FIR filter using frequency sampling design with an optimum approach. Use the transiton coefficient table given in Proakis and Manolakis. My M is 39, how can I use ...
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### Measuring accuracy and counting frequency?

The machines at my workshop have meter counters with hall effect sensor switches, which convert shaft rotation to electronic pulses. The switching signal is send to their PLCs' high speed counter ...
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### Bessel function normalization graph

This graph is drawn bessel function table but ı stick around reading table.Does table gives directly frequency spectrum amplitude values or only jn(ß) values?
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### Does data rate increase with channel frequency?

It is commonly said that a higher channel frequency implies a higher data rate. For example, in https://www.howtogeek.com/222249/whats-the-difference-between-2.4-ghz-and-5-ghz-wi-fi-and-which-should-...
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### How to improve flash time on lights controlled by solid-state relay via Arduino?

My goal is to flash lights around the house on and off to the beat of a song. When doing this with a mini LED and an arduino, it works perfectly with a "flash_time" of ~.1 seconds. This means ...
938 views

### 3dB Frequency of non-inverting amplifier

The question is The op-amp is described to have that transfer function and I am supposed to find the 3dB frequency of the entire amplifier. Here is what I did I used the fact that 3dB frequency ...
396 views

### How to find the Nyquist rate

I have the following signals and their Fourier transforms: $x(t)$ and $r(t)$. The signals are limited such that $X(e^{j\omega}) = 0$ for $|\omega| > \Omega$ and $R(e^{j\omega}) = 0$ for \\$...
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### Is it true that frequency deviation over 2*pi is the phase deviation of an FM/PM signal?

for ∆f frequency deviation if for FM only and PM has Phase deviation. and Kf= ∆f (Hz) of FM? Kf = ∆f (rad/s) for PM? and for th rules: ∆f=(kfmp)/(2p) for FM where mp = mp max-mp min ∆f=(kfmp)/(2p) ...
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### Measured doppler shift error biggest on direct flight on target

Following scenario: There is a radar on a plane which emits a CW Signal and outputs the measured doppler shifts from the reflection of a static target. I can see from the data, that the error of the ...
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Tried Googling this but I'm not really sure what vocabulary to use. I have a series of light sensors that will be detecting changes at the speed of 400 kHz (or 2.5 µs). I would like to use an ESP32 ...
1k views

### PIC32 Input Capture Module

I'm trying to use the input capture module on a PIC32MX250F128B to measure the frequency of a square wave. The results I'm getting are both inconsistent and incorrect. All I'm trying to do here is ...
2k views

### BLDC max speed KV or Hz?

So from what I've understood, the KV rating for a motor gives us the rotor speed based on the voltage applied at the phase of the motor. Having looked a bit deeper in ESC / inverters, I've come up ...
258 views

### Analog Phase Locked Loop Design

I am trying to design a phase locked loop in MATLAB's Simulink. For this, I am following this basic block diagram design: My original message signal is ~12 seconds long, has a bandwidth of ...
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### How to reduce full sine wave LUT to a singe sine quadrant?

I have implemented a full sine wave LUT, but would prefer to reduce it to a quarter. ...
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### How to change frequency range of this circuit

I need to design a frequency to voltage converter and I found this circuit on internet: I removed the resistor R6 and the capacitor C5 because what I need is the PWM output it gives on the 555 timer. ...
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### Are my calculations wrong?

So I'm trying to make relatively a large square coil antenna that will operate at 125kHz frequency. The width and height of antenna are 300mm (30cm) and wire diameter is AWG24 (0.51mm) and I'd like ...
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### Why do utility companies supply at a frequency of either 50/60 Hz?

It just struck me that Utility Companies world-wide supply domestic users at either 50/60Hz. It could have been selected to be 10 Hz, or 100 Hz ... whatever Was 50/60 chosen at random? Is there some ...
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### Can MCPCBs be used for audio frequency and/or MCU clock frequency applications?

For purely aesthetic reasons1, not for heat dissipation, I am contemplating using MCPCBs for these two applications: Audio frequency circuits, such as a Baby 8 sequencer, Atari Punk console, ...
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### SIMPLE digital control over 555 timer frequency and PWM?

I'm looking to create a sound generator with only simple ICs and components. I believe the 555 timer IC is a good candidate to be at the core of it, but I cannot for the life of me find out how best ...
86 views

### Crockcroft-Walton Voltage Multiplier Large Voltage Loss

I have a CW voltage multiplier that uses 30kV, 1nF capacitors and doubled 20kV, 5mA, 100ns diodes (for a total of 40kV). My ac source is a sine wave (viewed on the primary side of the transformer ...
2k views

### independent control of frequency and duty cycle in 555 timer (formulas)

I want to control frequency and duty cycle of output pulse of 555 timer. I searched and find this schematic in a post in SOV but I don't know how calculate frequency and duty cycle in the circuit. ...
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### How can I change a DC current to a 1.7/2.4 MHz AC current for piezoelectric device

I would like to start by saying my experience in electronics is very limited and I will include pictures of everything. I am, however, trying to assemble a device which puts a current through a ...
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### producing a continuous sound using a timer

I'm looking to produce a pure sound on one frequency to be played via a timer to come on at intervals over a six week period. this is for an undergrad dissertation. would an arduino work and could it ...
613 views

### Why do more phase shifts cause the need for higher bandwidth when Frequency Shift Keying (FSK) is used?

What I don't get is why a phase shift "decreases" the data rate and thus the need for more bandwidth to get the same throughput as without the phase shift.
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### frequency response multistage

hello every one i need ask about frequency response i have an old question of our professor exam in few year, and i try to solve this question many time but i can't so please if any one have idea ...
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### Pulse width for mark pulse

What is the pulse width for the mark pulse in an equal mark to space ratio pulse train operating at a repetition frequency of 5 MHz? The answer is suppose to be 100 ns .But I didn't understand how to ...
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### PIC I2C clock related problem

I am trying to make an I2C communication with a device by using PIC18F26K83. I use 8 MHz MCU clock. While trying to set I2C clock these options: Use 8 MHz MCU clock & HFINTOSC for I2CxCLK ...
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### In need of help to figure out why my 4046. demodulator circuit simulation is giving me errors

I’m currently doing a project on FM modulation and demodulation and on my proteus simulation I just can’t figure out how to do away with the two errors I keep getting. Here are the images of my ...
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### Focusing on Frequencies with Guitar Pedal Capacitors

I just built my first guitar pedal (a Bazz Fuss fuzz pedal), and now I'm messing around with the electronics a little bit. I was just wondering how I could target specific frequencies with the pedal. ...
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### Frequency circuit diagram

I have designed a frequency counter circuit diagram. See below. Now I am stuck on the part to wire up the decimal point in my circuit. The one that's the LED beside the 7 segment display. Do let me ...
29k views

### Changing the frequency of an AC supply

I am using an AC Power supply, and the frequency of the wall plugs is around 50hz. Is there a way to increase this frequency keeping everything the same?
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### Minimum Effort to Run a 1100W Hot Air Brush from America to Japan?

I'm entertaining an idea of making a small power supply to get a certain hot air brush (For hair styling) to function on the Japanese power grid. I like this hot air brush that runs only on 120V/60Hz ...
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### Not full-wave signal transmission?

Is it possible to transmit half-wave signals repetitively, like repetitive "north" magnetic fields like going from 0-1 Gauss "north" and repeat however many times per second without going 0-north-0-...
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### How to find the frequency of any device? [closed]

Are there devices which can figure out at what frequency every device transmitting radio frequencies operate at precisely? Say from a high of 2.4 GHz microwave to a low of 402 Hz pacemaker.
3k views

### How can i know the frequency range of electronic device?

How do I know the frequency of an electronic device? For example, we all know that the microwave is working under 2.4 GHz frequency. So, if I want to know the other frequency range for other devices, ...
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### Vibrato audio effect circuit

I would like to build a circuit that adds a "vibrato" audio effect to a simple sine wave input. Sample audio clip from Wikipedia: Vibrato, Sound Frequency 500Hz, Frequency Modulation 50Hz - Vibrato ...
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### Converting a variable frequency to TTL HIGH and LOW levels, based on a fixed (possible non-fixed?) frequency

I have a square output from an LM324 op-amp (0 and 5 volts) which has a frequency between 1 to 500 Hz (yes, low frequencies). I would like to find a simple way to have HIGH TTL signal when it is over ...
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### 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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### 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,...
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### Measuring a varying capacitance using the Wien bridge

I am going to make a capacitive soil moisture sensor. The principal that I'm going to use is the change of capacitance of the soil with moisture. What I'm going to do is make a capacitor that would be ...
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### Cheap RF 433.92MHz design, PCB track antenna [duplicate]

I'm doing a RF remote control project using a PCB with microcontroller and with simple onboard antenna layout as transmitter and a 433.92MHz receiver RWS-371F-6 model. Here is the datasheet of the ...
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### How is it possible to drive VGA displays at such high pixel clock frequencies?

I'm working on a digital circuit using discrete components to drive a 640x480 VGA display in a 80x30 text mode. For a 640x480 display, the pixel clock is 25.175MHz, which has a period around 40ns. I ...
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### Frequency Modulator with sinusoidal output

I am creating a frequency modulator, all the circuits that I have looked so far on the internet are generating a Pulse wave or a Triangular wave output, so if you guys can help me to create a circuit ...
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### How to use VBT-1 vibration sensor? Why the measurement unit is in mm/s?

I need to use this vibration sensor for my project. I'm confused because of the measurement units. Out value of the sensor is in current 0-20mA, which corresponds to 0-25 mm/sec. Why is it being ...