# 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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### Two formulas for defining RMS and average of a waveform through a diode [duplicate]

A textbook problem where we have this given current waveform through a diode. We are required to determine the maximum and RMS values of it [ Irms and Ip ] giving the average current= something ...
• 39
490 views

### RMS of sine wave curve defined between two points

Could someone explain for the following attachment (waveform image) how were exactly the values of "RMS" and "average" determined this way (for that curve of sine)? Given the duty ...
• 39
52 views

### Generate 200MHz Phase-Shifted Voltage Sine Waves

I'm looking into a way to construct a circuit that can generate ~200MHz negative voltage sine waves (8 channels), where there is 11 degrees of phase offset between the channels (0 deg, 11 deg, 22 deg, ...
123 views

### How can I convert a sine wave generated by PWM technique into a square wave?

I have generated a variable frequency sine wave by PWM using an Arduino Uno. I want the obtain a square wave using the generated sine wave, so I used an op-amp to remove the DC offset in the sine wave ...
1 vote
43 views

### Diode directed into the negative terminal of a sinusoidal voltage source

If my V_in is a sinusoidal voltage, what would be the V_out? I tried to plot this in ltspice, however, I ran into trouble on where to connect the ground, on what node should I use to extract V_in and ...
95 views

### Building a unity-gain op amp with speaker?

I am trying to build a voltage follower op-amp circuit to hear a sine wave but I can't get it to work. I was using the LM386 but then found out that it has a gain of 20 by default so I can't use it. I ...
87 views

### Using a square and/or sine wave generator through a speaker [closed]

I have recently undergone some university study which introduced square and sine wave generators, I was wondering if there's a specific speaker I could use (its inputs would be a power supply and the ...
237 views

### How can I generate a 100kHz sine wave on FPGA?

I am performing direct digital synthesis on my FPGA using lookup tables, and jumping through them to increase output frequency. As the value of the phase accumulator increases, the sine wave becomes ...
913 views

### Just inherited a digital phosphor oscilloscope and trying to figure out why the sine wave is doubled

I was just given a Tektronix TDS 3014B and I wanted to learn how to use it. I setup a simple sine wave generator and I'm working through all the menus. When I start the sine wave, everything looks ...
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1k views

### BJT as current buffer for op amp

I am working on creating a 10-20KHz 0-5V sine wave feeding a coil which would be around 450uH. At this stage I am stuck in that I can produce the sine wave using an STM32 or a DDS IC but that will not ...
1 vote
208 views

### Sine wave CMOS buffer from inverters with or without feedback

Is it possible to buffer a sine wave using inverters alone or with some kind of feedback? I've been browsing google for minimalistic (I'm in 3.3-12 V domain) sine wave buffers and this thought stuck ...
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90 views

### High voltage pad buffer design with 2nF load and ringing on first stage output

I am trying to design a high voltage (12V) buffer that will drive a sine wave with rail-to-rail peak-to-peak amplitude and a big capacitive load, maybe 3nF. Browsing I came upon this Master's project: ...
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58 views

### Input stage for sampling audio sine wave with ADC

I'm building a prototype, checking the potential for a project. I want to be able to sample a sine wave from a power amplifier using a Teensy4 ADC. I have a Teensy 4.0 powering an Evisun isolated DC-...
242 views

### Simulating square to sine wave conversion via LC circuit results in 200-fold amplification

After watching this video I decided to simulate the following circuit in PSpice: Time domain simulation with general settings, TSTOP of 100 ms and maximum step size of 1 μs yielded the following sine ...
352 views

### What is the output voltage of 1 Vp-p specified sin/cos encoders?

Encoders with sin/cos analog output (example model Hengstler S21) typically specify the output signal as 1 Vpp. This seems to be some kind of de-facto standard for the output amplitude. If I ...
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97 views

### When can we apply phasor analysis to an $RLC$ circuit?

This answer of mine shows that not every $RLC$ circuit reaches sinusoidal steady state at input frequency. A well-known theorem states that: If all natural frequencies of a uniquely solvable LTI ...
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1 vote
92 views

### Op-amp not increasing amplitude of signal

I was doing some LTSpice simulation with an op-amp to amplify a 1 millivolt 40 kHz sine wave. However, in the output signal, it had just raised the voltage of the whole waveform, it decreased the ...
257 views

### XR2206 Signal Generator breaks up and distorts badly all waveforms

I just put together this signal generator with a xr2206 DIY kit, single supply, tried 9,6V smps first (too low!), then w/ checked speced minimum 12V DC Li-Ion Vcc, same behaviour, distortion/unstable. ...
124 views

### Strange low frequency sawtooth in a 110 kHz Hartley oscillator

I am trying to build a Hartley oscillator for 110 kHz using a BJT according to the following schematic: I am assuming $\beta=100$ and $V_t=25mV$ The collector current is about 1.63 mA, Vc is ...
1 vote
87 views

### High pass filter doesn't get back original signal?

If you simulate this (from https://www.circuitlab.com/editor/#?id=3p73kzybb5r8): simulate this circuit – Schematic created using CircuitLab You see this: The input is a combination of the ...
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219 views

### Why does my spectrum have humps?

In a fun experiment I used an Applicos ATX7006A 18 bit AWG to generate a 1 kHz sine wave and used an Analog Devices AD7671 16 bit ADC to digitize the waveform, then coherently captured the digital ...
245 views

### How can I find the time period for two sine waves using the oscilloscope in Multisim?

The formula for calculating the phase difference requires a time delay and a time period which is given in the formula: Φ = td/tp × 360 Where ...
2k views

### What causes the trough of a sine wave to become sharp?

I am using a white LED to send a 5 V p-p: +2.5 V to +7.5 V, DC offset of 5 V, sine wave of frequency 1 kHz as shown in the transmitter circuit. The current generated by the photodiode is converted to ...
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131 views

### Impedance matching a function generator and a laser source

I am using a function generator to generate a sine input to a modulated laser. The function generator has output settings of 50 Ω and High-Z, while the laser for some reason has a 1 kΩ input impedance....
• 115
139 views

### Is it possible to connect an antenna of the proper length to a CPU and radiate its 4 GHz oscillating current?

Since a 4 GHz CPU has been made to provide that super high frequency, is it possible to connect an antenna of the right length to it and radiate its 4 GHz oscillating current?
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### Class-D audio amplifier produces a sawtooth wave on the output, not sine

I am using a MAX9744 Class-D amplifier and want to get a sine wave in the output. Someone suggests using an LC low-pass filter for this, and in the datasheet of the amplifier, the values for inductors ...
122 views

### LTspice problem with small amplitute sine wave

I simply wanted to generate a low amplitude sine wave, but the weird waveform happened. Why is the plot not showing the sine wave?
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299 views

### Alternate between 0 and 180° shift at regular intervals for a sine source during a .tran operation on LTspice

Is it possible to alternate between a 0 and 180° shift at regular intervals (say every second) for a sine source in a circuit during a .tran operation in LTspice? (I need to see the reaction of my ...
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1 vote
85 views

### Distortion from bridge driver

I am feeding a square wave signal into some NAND gates and then into an ICL7667 MOSFET driver, which in turn drives an LC circuit. The enable is shown for reference, but if always on. Trace 1 (yellow) ...
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1 vote
574 views

### Generate a sine wave with MCU

I want to generate a sine wave without an offset voltage. I generated a sine wave from 0 to 3.3 V and it has a 1.65 V offset. I need a sine wave from -1.65 V to 1.65 V using an MCU. How can I do that?
856 views

### Why does this inverter use two bridges?

I recently destroyed a 1000 W-rated 24 VDC -> 220 VAC pure sine wave inverter I bought a while back from Ebay, by connecting its output to mains power inadvertently. Afterwards, I decided to ...
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545 views

### Why is an inductor kickback wave-like?

I though that an inductor, when it doesn't have current flowing through it anymore, would quickly discharge in the opposite polarity. More precisely, I was expecting one quick peak in a negative ...
365 views

### Why doesn't the voltage at the resonance frequency go above the input frequency of a sine wave source?

I have performed a simple RLC parallel circuit experiment to determine the resonance frequency. I used the voltage as the magnitude. Experimentally, the magnitude at the resonance frequency tops at ...
475 views

### AGC for integrator circuit

I am trying to generate a sinusoidal wave whose frequency I can control based on the input being a triangular wave. I am getting the sinusoidal waveform by integrating the triangular wave through an ...
91 views

### Phase to phase voltage noise in a BLDC sine wave controller

I am trying to program a BLDC controller using SVPWM. The waveform attained from phase is almost what I excepted. I also cross verified with another BLDC controller which is available in market. The ...
166 views

### Output voltage halved in 3-phase SPWM inverter simulation

I am just trying to simulate a 3-phase inverter connected to a star-connected load controlled through sine PWM modulation. In real life, I would expect a carrier that would go from zero to one. As ...
163 views

### How to design a function generator (Arduino Nano) to filter out noise of different signals?

I have an Arduino Nano-based function (sine, sawtooth, triangular, square) generator. Basically it is an Arduino Nano connected to a MCP4802 DAC, whose output is connected to an RC lowpass filter. ...
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1 vote
81 views

### What am I doing wrong with this tuned oscillator?

How I can start it? I need a 27 kHz sine wave, but I can't run it.
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117 views

### Is it possible to change the waveform of AC from sin(x) to |sin(x)|?

The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with the positive direction of the current and vice versa. So, is it ...
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698 views

### Is it possible to change Arduino Nano sine wave frequency without using PWM? [closed]

I have a program that generates a sine wave (array with predefined 8 bit values) on an Arduino Nano. ...
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168 views

### Does this inductance measuring oscillator circuit work?

I'm planning to create a circuit to measure inductance by creating a stable sinusoidal oscillator out of it with a known value capacitor. Then measuring the oscillator frequency accurately with an ...
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462 views

### Noise in sine wave BLDC controller

I am trying to control a 3-phase BLDC motor. I have already done 6-step commutation, which works fine. Now I am going for sinusoidal control with some guidance could make it good. I had get a good ...
207 views

### Sine wave generator frequency

I'm trying to build a sine wave generator following this walkthrough. Specifically, I'm attempting the Clapp circuit as I'm targeting about 113 kHz. Here is the circuit schematic: In the article the ...
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87 views

### Attaching Lower Impedance Part to a Function Generator

If a speaker with a hypothetical 3 ohm impedance is attached a signal generator with an output impedance of 50 ohms, will the speaker draw too much current, and overload the signal generator?
912 views

### Why does using a pure sine wave inverter help reduce audible and electrical noise in some electrical appliances?

I read on some power bank description: Stable AC Output: The built-in AC wall outlet uses a pure sine wave inverter to reduce audible and electrical noise in fans, lights, and other sensitive ...
794 views

### Pure sine wave 500 W inverter

I am trying to come up with a pure sine wave DC to AC inverter. Above is the circuit diagram I tried simulating in Proteus 8086. I got errors as shown above, please help me fix those errors. See where ...
699 views

### Intuitive explanation for RMS voltage of discontinous sinewave

A sinewave with a peak voltage of 325.3V. The RMS voltage would be 230V Assumption1: If I were to run this AC sinewave through a resistor it would be the same power dissipated as running 230V DC ...
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846 views

### Triangular wave response of RC circuit

I am trying to intuitively understand the response of the RC circuit for a triangular input. My understanding is as follows: Let the ramp be mt.u(t) Initially, the voltage drops mainly across the ...
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