# Questions tagged [sine]

For questions about sine waves as used in electronics (e.g. AC waveforms, oscillator outputs, signal generator outputs, etc.). Consider using in conjunction with tags such as "ac", "oscillator", "math", etc., if applicable.

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### What do I add across the opamp to get a full sine wave?

I'm struggling to figure out a solution to avoid saturation, I believe the solution will require some component to be attached across the opamp to produce the same voltage out as voltage in (voltage ...
• 23
41 views

### Matlab: using a small sample time for sine wave, makes the wave's frequency "accelerate"

I noticed that if I use a small sample time of DSP sine wave in matlab, the signal's frequency "accelerates": This is the signal with a proper sample time: But if I reduce the sample time ...
59 views

### How do I implement half wave symmetry for sine wave generation in Verilog?

I want to generate a sine wave using a look-up table of 1024 points. If I use half-wave symmetry, I only need 512 points in the LUT. I tried implementing this using Verilog but the output is not ...
123 views

### Has Don Lancaster really got his "Create Sinewaves using Digital IC's" publication wrong?

I answered this question a moment ago, and looked around for some stuff on the net to support it. The original publication is "Digital Generation of Low Frequency Sinewaves", Anthony C Davis,...
• 140k
1 vote
144 views

### Generate a 120 degrees out of phase sine wave

I want to phase shift a sinusoidal by 120 degrees two times (in order to generate a 3 phase signal). I generated the first sine wave using an internal DAC. The sine wave is offset by 1.65V with a peak ...
• 1,231
125 views

### Converting square wave into a sine wave [closed]

I am trying to convert a 1 MHz square wave into a sine wave of the same frequency. What's the best way to achieve this?
1 vote
101 views

### How to generate a PWM low frequency sine wave without a microcontroller

I have a project (powered by a small battery) where I want an LED to slowly fade in and out. For this effect, I want to make a PWM signal that resembles a sine wave. Is there a method for this without ...
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130 views

### Generating and measuring a sine wave with THD below -80dB

For an experiment I need to generate a sine wave which has a THD below -80dB. I would like to do that using a band-pass filter connected to a function generator because the output of the function ...
• 159
36 views

### Clock Crystal Output for Driving a TTL load

I am attempting to re-create the video drive circuit from an IBM 3101 terminal. I just have the monitor, and I thought it would be really cool to drive it from something like an Arduino. I found some ...
151 views

### Sine wave amplitude to binary MATLAB lookup table

I'm trying to generate a 256 point 8-bit sine lookup table for digital synthesis. I wrote the below MATLAB code for generating the binary numbers from amplitude and copying into a data file. It works ...
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493 views

### Noise in tunable sine wave oscillator

I recently soldered a tunable phase shift oscillator on a bread board pcb. It produces a sine wave in the range from 80 Hz to 3,3 kHz. The oscillator frequency is tuned with a dual 100k potentiometer. ...
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107 views

### Voltage follower output half wave signal; how can I reduce the ringing on the output?

I have used a voltage follower with a TSH082. I was able to get a half-wave signal with some slight ringing on the output (shown below). Is there a way to reduce the ringing on the half-wave signal ...
• 189
75 views

### Non-inverting amplifier isn't amplifying my signal

I am using a non inverting amplifier (shown below). For the opamp, I am using TL084, and I am using 12V single supply. I am getting an output of 11.20Vdc even though the input is 1.06V sine wave. I ...
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978 views

### Circuit that converts sine wave to RMS voltage

How do I design a simple circuit that converts a sine wave to an RMS voltage? The input will be a sine wave and the output an RMS voltage. I know I will need an ADC, but not sure which one. I also ...
73 views

### Finding Phase Angle

How would I go about finding the phase angle at different times? For example at 50 Hz with a full cycle time of 20 ms I know at 10 ms the phase angle would be 180°. What calculation could I use to ...
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1 vote
110 views

### Asymmetric sine wave

I've got a signal generator sending a sine wave to a PCB (X3). I closed jumper 19 so I measure D10, a GF1M diode. I measured the voltage over test point 16 (TP16) and the voltage over TP18. I get the ...
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1 vote
73 views

### How to measure the stability of sine wave peak-to-peak voltage

I am currently using AD9833 to output a sine wave signal. I have seen the sine wave signal on oscilloscope and saved a CSV file on my flash drive. I plan on using an Excel or Matlab to determine the ...
• 189
213 views

### Average value and RMS value

I am trying to understand the concept of RMS value. From whatever I have read and the tutorials I have seen, I have seen them derive the RMS value only considering the first positive half cycle of the ...
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42 views

### Double conversion UPS off a modified sine input?

I have a 2000W modified sine wave inverter running from 12V bank in a tractor-trailer. It’s company owned, so no changing or adding equipment. Only viable solution I can see to achieve a sine wave is ...
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237 views

### Phase difference between the input and midpoint of voltage divider? What can I do about this?

I am very shocked to see a phase difference between the input and the midpoint of voltage divider. The voltage divider for this circuitry is two 1Mohm in series. The input signal is powered by the ...
• 189
85 views

### Sine wave signal lagging; potentiometer has inductance? [closed]

my sine wave at the midpoint of potentiometer is lagging by 74 degree when comparing to the input, and my potentiometer is 500Kohm. Is there a low inductance potentiometer? I do not know how to pick a ...
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190 views

### Generating high frequency resolution sine wave

I want to generate a sine wave with a frequency of exactly 19.999995 kHz. This is possible with a DDS generator implemented inside a FPGA. The DDS signal will be a digital one. So I will use a DAC to ...
• 343
93 views

### How does this DC offset sinwave input work?

I have learned that this circuit will move the sin wave up to a DC points due to the voltage divider, that is: V_out = V_in + Vcc*R2/(R1+R2) I was using LTSpice to simulate this and it works, I try to ...
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1 vote
73 views

### Proper way to design sine inverter

I have looked through many examples and tutorials of how to design sine wave inverter. But all those tutorials show how to make very basic inverter, which is not meant to be used for any load. Or they ...
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699 views

### Benefits of using a sine wave filter with variable frequency drive

Sometimes sine wave filters are installed on the output side of a variable frequency drive (VFD.) My understanding is that these filters are advised in situations where there may be capacitance among ...
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### Voltage Follower vs Half Wave Rectifier

So I used a voltage follower with an input of a sine wave signal (positive and negative cycle) . The output was half wave signal which is what I wanted. Why do people use half wave precision rectifier ...
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40 views

### I’m working with pcf7991at antenna driver ic

Just wondering if you can help me I’m trying to calculate capacitor and resistor values for a 125khz inductor coil . My coil measures 6.8 ohms. I’m not sure how to calculate the capacitor values ...
90 views

### Are there any mistakes in the circuit which would cause overheating and damage to IR2110 driver IC?

I’m designing a sine wave inverter. I bought 4 IR2110 ICs from local shop. All of them draws excess current and starts to overheat when I connect Vdd and Vss to 5v supply and Ground respectively. ...
207 views

### Why do log sine sweeps traditionally start from low frequency?

I'm doing a log sine sweep to get the frequency response of a device. The software works fine, but the first low frequency half period introduces a bit of DC offset in the signal coupling caps, so ...
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107 views

### why Arduino Nano Atmega328P D9 & D10 GPIO Blowing while using PNP Transistor S8550?

I am trying to make an Simple Sinve Wave Inverter circuit using below Schmatic. As soon as I connect this circuit D9 & D10 gets damaged. should I change the value of 100Ohm to 1K ? will that solve ...
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64 views

### transform the square wave of a voltage inverter into a sine wave

I'm building a voltage inverter to power a refrigerator compressor, to lower the cost and simplify the project. I chose to use mosfet irfz44n on the primary part of the inverter, which however will ...
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127 views

### Pure sine wave inverter 200W

I would like to transform 12V DC to 230V AC 50Hz, peak load 200W. Efficiency is not a concern. Main concern is puresness of the sine wave. If I am searching for "pure sine wave inverters" ...
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200 views

### How to choose a resistor value for Wheatstone bridge such that it is a balanced circuit?

I have a 3V sine wave input and I want to measure resistor precisely from 1 ohm to 40ohm. I have tried using Arduino to measure the resistor using voltage divider but it became obvious that I will not ...
• 189
63 views

### Frequency de-modulation question [closed]

Why is in some cases that the messaged received from the demodulation process has slightly more amplitude then the original message?
152 views

### Sine wave signal at resonant frequency gets distorted

I am currently at lost on what I need to do to solve my problem. I have a sine wave signal as my input, and the output is sine wave as well. At resonant frequency, the output of the signal gets high. ...
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68 views

### Two sine wave of 0 to 5V,with a frequency of 500Khz. How do I find the phase difference between the two sine wave

I have two sine wave with a frequency of 500Khz, and voltage range of 0 to 5V. I would like to detect phase difference between the two sine wave; especially, when the phase difference between the two ...
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199 views

### Synonym for Sine Wave Half Cycle

One cycle of a sine wave (such as the mains power voltage) consists of two half cycles (often called positive and negative in electronics). Is there a (preferably one-word) term to refer to such a <...
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229 views

### How do I determine which microcontroller can help me measure peak to peak voltages for my 400 kHz sine wave signal? [closed]

I have 400 kHz sine wave signal with a variable voltage between 0 V to 5 V, and I would like to use a microcontroller to measure peak to peak voltage of the sine wave. My understanding is that the ...
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707 views

### Shannon-Nyquist - only for repeating signals?

This was triggered by the comments in this question. I'm using this definition of the Shannon-Nyquist theorem (form wikipedia): If a function x(t) contains no frequencies higher than B hertz, it is ...
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121 views

### Negative terminal of a sine generator

simulate this circuit – Schematic created using CircuitLab I had this problem where the anode of a diode was connected to the negative terminal of a sine generator. I wondered how it functions ...
1 vote
115 views

### Excessive current in this inverter design

I made this inverter with Proteus. The phases have no load at all, but the input current is very high (red arrow.) This happens only when capacitors marked by the green arrows are connected. They ...
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248 views

### Measuring the amplitude difference between two sine waves - to 20 bit accuracy

Two sine waves, same phase but different amplitudes. I need to measure the difference between the two amplitudes to one part in a million over about a one second interval. The most obvious solution ...
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625 views

### Constructing a sine wave generator circuit using LTSpice

I am trying to make this particular Wien Bridge Oscillator (WBO) circuit using LTspice. Ideally I should get an output sine signal. Although I can't seem to make it work. Anything wrong with what I ...
72 views

### Is a sinewave that is present entirely within the positive domain DC? How to calculate Vrms for a DC offset sinewave?

I've been given some conflicting information with regards to the current type of a sinewave that has no negative component e.g. 20-30V pk-pk is either DC or AC. I have been taught by my lecturers that ...
168 views

### Amplify 1kHz sine wave from AD9833 DDS using LMH6609 operational amplifier

I'm trying to amplify a 1kHz sine wave signal from the AD9833 DDS chip (0.6Vp-p) to a more usable level (6Vp-p) for a sort of function generator. I plan to work with higher frequencies as well. So I ...
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### Pure sine inverter?

I just bought a van and am planning on traveling across country with my pup. I want an affordable pure sine inverter I can easily use. It is cold here and I’m sure it will get colder as I travel. I ...
385 views

### How can I explain the unexpected negative voltage in the output signal obtained from half wave rectifier?

I observed the output signal of half-wave rectifier sending sine wave and square wave for an experiment. The rectifier was built with a 1N 4001 diode and a 100 ohm resistor. The output signal across ...
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410 views

### What is the reason the output signal I obtained from full-wave bridge rectifier has changing amplitude?

I observed the output signal of full-wave bridge rectifier sending sine wave and square wave for an experiment. In both of the output signals it is clear that each cycle shows one of the two different ...
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1 vote