Questions tagged [waveform]

The shape of a value (usually voltage) when graphed over time.

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3answers
57 views

Regenerated current during deceleration of PMSM motors

Let's say that a VFD is powering a PMSM and the motor is rotating at rated speed. The motor is connected to a high inertial load, so it cannot decelerate quickly. Now if the VFD commands a quick ...
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1answer
58 views

Problem amplifying differential signal from DAC

I encountered a problem while designing my own waveform generator. In my design, I am using a DAC (DAC5662) to generate different types of signals, and then I amplify the signal using an operational ...
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3answers
73 views

Electromagnetic radiation diagram

Would I be correct to assume that this diagram isn't really how the field propagates in space? But it's just an illustration of the changing electric field strength as a function of time? For example ...
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2answers
83 views

555 Timer with 50% duty cycle

I've seen below 555 circuit which produces a square wave of 50% duty cycle. I am quite new to electronics and I saw Ben eater's 555 timer tutorial where he used discharge pin for capacitor discharging....
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0answers
88 views

Inductor voltage not decaying to 0V by t=5 TC

In a new lab I have the following circuit: The inductor will change from 200 mH -> 400/600/800 mH. I am starting with 800 mH. The function generator is a square wave at: 50 Hz, 20 ms period, and ...
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1answer
58 views

RC circuit waveforms not lining up on oscilloscope (capacitor starting negative)

I have a lab for a circuits class and in it we are building an RC series circuit with a square wave input. I am using a function generator to produce a square wave at 50Hz, period = 20ms, Amp = 500mV,...
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1answer
94 views

What could cause this flyback output current oscillation?

I designed a dc-dc flyback converter that is expected to reach 30 W output power. But it seems there are problems with reaching maximum power. Firstly I tested without the input filter and with non-...
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0answers
50 views

Inductor saturation current

im trying to determine an inductor's saturation current, i use a pwm with a gate driver (tlp250) and a 0.4 sense resistor at the source which i prope across to capture the current waveform. I salvaged ...
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4answers
123 views

440Hz triangular wave generator makes slow non-triangles

I'm attempting to generate a 440Hz triangular wave with the following circuit powered by a +5 V DC supply: The circuit uses an NE532 low-power dual op-amp to build a square wave generator (left-hand ...
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2answers
217 views

How to make this arbitrary waveform?

Im trying to generate a custom waveform based on the instrumentation amplifier. The concept is that using two signals* , square 2Vpp and triangular 1Vp, get the next output: Under the next ...
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1answer
74 views

BJT twin transistor astable multivibrator always outputs high

Noob here (again). I have made this schematic of an astable multivibrator and a Raspberry Pi. I want it to produce a square wave, but it just outputs high constantly. I use the Raspberry Pi as a ...
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1answer
72 views

Why isn't my generator able to output the correct signal in a closed circuit?

I have a Siglent 1032X waveform generator. When I try to output a certain DC signal, my multimeter shows there's a significant voltage drop across the generator itself in a closed circuit. For ...
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1answer
80 views

Double pulse test time interval [closed]

Keeping all other parameters (like DC bus voltage, Bus capacitance, Inductor value, etc.) fixed, and only changing the time interval between the two pulses, why would there be a difference in the peak ...
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1answer
64 views

Current flow in full wave bridge rectifier during negative half wave

I was watching a video on full wave bridge rectifiers and was wondering why the current flows in the direction of the green arrow (+ to point C) during the negative half wave, instead of going in the ...
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2answers
116 views

Buck converter waveform

It became very hard for me to understand the concepts associated with buck converter waveform. What is the role of capacitor in its output terminal? Is it used for smoothing the voltage ripple? Why ...
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0answers
58 views

Reduce the effect of half wave rectifier on transformer

I have an electromagnetic feeder drive which is supplied from a transformer. When I see the catalogue of the drive I noticed it using just the positive pulse of the AC source (half wave rectifier.) ...
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6answers
625 views

Waveform result of an equation

I have this waveform and I would like to have the Y. I know that the equation is Y = D' + E' + F'. Where it has ' it means NOT. ...
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3answers
146 views

Function Generator to Audio Amplifier

I am looking to control a Helmholtz coil with a function generator but I need a waveform amplifier to increase the current and voltage from the function generator. The coil has to be run using low-...
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1answer
67 views

can we convert triangle wave to DC voltage? can i get any model circuit? [closed]

i've achieved converting square wave to DC by voltage doubler, where in case of triangle wave its hard to find solution to convert it into dc voltage triangle wave form frequency is between 100khz to ...
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1answer
78 views

Measuring a 10s waveform with a oscilloscope

I have a MDO3034 oscilloscope which I need to use to measure a waveform for ten seconds. This waveform is a PWM whose duty cycle varies every 0.2ms or so, and restarts itself every ten seconds. I need ...
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2answers
158 views

Normalize a sinusoidal wave to a fixed voltage [closed]

As input I have got a sinusoidal wave of variable amplitude (Vin). This amplitude can be whatever between 0.5 V to 5 V for example. I want to normalize this input to a fixed sinwave with amplitude ...
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0answers
71 views

Can't Make Square and Triangle Waves

I have the following c++ code for making a sine wave using SFML, which i got from https://github.com/SFML/SFML/wiki/Tutorial%3A-Play-Sine-Wave. ...
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1answer
37 views

Siglent SDS1104X-E Integrate Function - Units of Measure

I am using a Siglent SDS1104X-E four channel oscilloscope which has a variety of math functions, one of which is to integrate a signal. Currently I am measuring a voltage pulse across a gate resistor ...
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3answers
394 views

Why does my op-amp circuit output a rectangle wave form instead of sine?

After tons of research on the web I still don't know what the problem is. I'm trying to simulate a non-inverting voltage amplifier. It is supposed to generate a similar waveform but when I use the ...
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1answer
59 views

How to improve and add frequency adjustment function to my DIY wave generator? [closed]

Introduction I want to build a wave generator. I chose wien bridge oscillator(WBO) as my oscillator and I obtain other waveforms by filtering the sine wave I get from WBO. I managed to get a fairly ...
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2answers
124 views

Capturing mains AC waveform with audio recording device

I'm wondering how practical (read: safe) it would be to use an audio capture device to "record" a mains AC signal for the purposes of monitoring the characteristics of the AC sine wave. I am ...
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1answer
37 views

Inductive Crankshaft Sensor Operation

I would like any possible explanations/diagrams of how the waveform voltage rises at the point where the missing tooth/teeth of the reluctor wheel approach and pass the Inductive Sensor. This is just ...
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2answers
215 views

LED not outputting square wave signal

I'm working on a sensor similar to an oximeter that measures light attenuation through a medium. I have an LED on one side, and an IC photodiode with on-chip transimpedance amplifier (OPT101) on the ...
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1answer
93 views

Waveforms of BLDC motor

I am using L6235 to drive a BLDC motor with hall sensors, but I am not sure about the motor's wire connection. Can you tell which connection is correct by looking at the waveforms? datasheet of L6235: ...
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4answers
274 views

Why do we use the terms AC and DC if they have nothing to do with current?

It seems archaic, maybe that we use the term AC (alternating current) and DC (direct current) to talk about power systems. After all, it is the voltage waveform we're usually referring to. In my first ...
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0answers
28 views

Inaccurate differential voltage measurement

I tested 3-level PFC voltage initialization event in practice using 1 x single ended probe to measure the output voltage as well as 3 x differential probes to measure the precharge voltage levels of ...
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4answers
168 views

What could be generating this waveform in an EMC Compliance test?

We are having trouble with a CISPR-11 (EN55011) Radiated Emissions Class B compliance test in one of our solutions. The troubling part of it is basically an industrial motherboard (with a commercial ...
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2answers
61 views

Current values after power factor correction

I am a student tasked with correcting the power factor of an RC circuit to unity with a parallel inductor... Vrms = 240V, 50Hz R = 12ohm C = 220uF. I have calculated the inductor value by calculating ...
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1answer
92 views

Why does my VHDL simulation fail after one input for this device?

EDIT: Found a solution. See the bottom of the post I am wondering why my simulation of the following entity fails to run for more than one input. When I change the inputs, the system crashes, and I ...
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1answer
37 views

Can AC harmonic quantities be expressed as a sum of phasors of different frequencies without confusion?

https://www.electronics-tutorials.ws/accircuits/harmonics.html The problem with AC harmonics is that each term has a different frequency, being a integer factor of the first frequency. I was wondering ...
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2answers
76 views

Square wave, triangle wave etc. not defined in International Electrotechnical Vocabulary (IEV.) Are they not standard terminology?

Why are there no definitions for typical terms like square wave, triangle wave etc. in the International Electrotechnical Vocabulary (IEV)? Are these widely used descriptions not defined by ...
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1answer
54 views

Triangular wave to sawtooth wave

wanted to design a sweeper circuit to change a triangular wave into sawtooth wave. Is there a schematic for this to design a circuit?
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2answers
125 views

Simple current transformer strange waveforms

I'm trying to build simple 50Hz current transformer (just to see the mains current - maybe some microcontroller measurment in the future) following the answer to this question. When I connect it to a ...
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4answers
142 views

How can you generate this waveform?

I'm looking to make a circuit that takes a 20-30VDC input and, when that goes high, generates a signal that also goes high, but to a different voltage (2-10VDC). Then after some time of being high (on ...
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1answer
100 views

What are the waveforms of radio frequencies?

What is the waveform of radio frequencies?I thought they are sinusoidal am I wrong?
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1answer
45 views

How can the charge time/startup time for a boost generator be calculated?

I've been reading about boost converters and how to do calculations with them, but I haven't found equations/an equation for determining the startup (?) time for them (where the load has a high ...
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1answer
49 views

Do I need more capacitance for my crystal?

I've used the formula "CL = (C1 * C2) / (C1 + C2) + Cstray" (where C1 = C2) to calculate the capacitors I need for my board. CL is 18pF, I ballparked Cstray at 5pF, meaning I should use ...
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9answers
6k views

If a square wave has infinite bandwidth, how can we see it on an oscilloscope?

If a square wave requires infinite bandwidth how can we display it on oscilloscopes? Link: Oscilloscope fundamentals.
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1answer
58 views

Obtaining frequency of 550 Hz from Simple Triangle and Square Waveform Generator Circuit

First time asking a question so sorry if I miss some things. I'll try to be thorough and straightforward. I'm trying to design a square wave from a triangle wave-square wave generator circuit. The ...
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1answer
273 views

LM358 waveform generator issue

I would like to generate a 30 kHz & 60 kHz sawtooth waveform using an LM358P operational amplifier per the following schematic. Theoretically, and in the simulation, the circuit should work ...
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0answers
55 views

Why this stabilisation issue occurs for this waveform?

I'm using this simple wave folding schematic: This would be best described with two short videos. Both videos have triangle input into wave folder, and I am changing the amplitude with trimpot. First ...
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1answer
202 views

Resulting current waveform of square wave voltage applied to capacitor/inductor

If a square wave voltage waveform is applied across a pure capacitor or inductor of a given capacitance/inductance, how will the resulting current waveform look? How should I calculate this using the ...
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0answers
90 views

Pros and cons of supercapacitors in defibrillator

Basically I wonder about pros and cons of using super capacitors in defibrillator. It is known that 1.5 - 7 kV signal with duration from 1 to 200 ms is applied. The energy should not be more 200 J. ...
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1answer
244 views

Rise time of 6N136 opto-coupler

I am trying to use below circuit for convert 24VDC high speed pulse to 5VDC pulse that can interface to a stepper driver IC. I have used 6N136 opto-coupler and according to its datasheet it can handle ...
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1answer
89 views

Strange Waveform Using FPGA with NI myDAQ

I am testing my Microsemi FPGA with a NI myDAQ and am getting some strange waveforms. All that I am doing is inputting a 3Vpp square wave at 10kHz and expecting the same output since my code is just ...

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