Questions tagged [waveform]

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

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2answers
65 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
38 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
81 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
130 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
97 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
16 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
45 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
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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
46 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
89 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
47 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
59 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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52 views

Voltage booster for an Arduino Uno waveform generator

Recently I made a waveform generator using an Arduino. Its output is only 5 volts, but I need 113 kHz with 15 or 12 volt (I think) for an ultrasonic mist maker. Is there a circuit to increase the ...
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73 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
39 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
49 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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3answers
105 views

Circuit find IB, IC and VCE?

I'm asked to find IB, IC and VCE. This is my answer: I wonder if my answer is true are not. VCE Value is negative, is this true or not?
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0answers
64 views

What am I doing wrong? Waveform generator and Oscilloscope test

In the circuit below, PS1 is a waveform generator. Originally, there will be the secondary of a current transformer. R36 is a MOV, D11 is a TVS diode and R29 a burden resistor. D12 sets the non ...
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1answer
83 views

How to count these spikes?

This signal is from an instrumentation amplifier, read from Arduino MEGA2560 ADC, loop delay 10ms (rate 100Hz) I need to count high spikes only, (in below figure, 6 high spikes can be observed) Edited ...
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2answers
124 views

Gaussian signal generation circuit

I was studying op amp application and saw the square wave, triangular wave, sine wave. I was wondering if it is possible to generate Gaussian shape wave with op amp. I am basically trying to modulate ...
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2answers
138 views

Best waveform for Radar

I was wondering what would be the best waveform to generate for a phased array short range imaging radar? Square, sine, etc. Also what frequency would be best to operate at for the carrier wave given ...
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1answer
116 views

Can a DAC produce only positive output?

I'm working on a project requiring production of sinusoidal waves. Normally, from my understanding, a DAC can produce a waveform that alternates between a negative voltage and a positive voltage, but ...
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2answers
92 views

Transient solution of current in circuit with two coupled inductors, with resistances

Circuit in question is given below. I want to find why I can not get the same current waveform as PSpice gives me. Basically I want to calculate formula for i1(t) by hand and get something as close ...
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1answer
54 views

Smooth signal using a capacitor [closed]

This is a full wave bridge rectifier I have read that if you put a capacitor parallel to the load resistor instead of DC pulsed signal we get a more smooth DC signal. However I am unable to ...
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0answers
109 views

Output waveform of an SMD crystal oscillator

I am going to setup lwIP on STM32f107RCT6 with DP83848 PHY device. The green LED of RJ000002 ...
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3answers
156 views

Measuring the waveform of mains voltage using an oscilloscope

I understand this is a recurring discussion, but I still can't find a concrete answer to this question. I would like to know how can I inspect the waveform of my UPS output (230V) using an ...
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1answer
42 views

Understanding voltage sampling rate of induction motors

Why it is required to have a sampling rate of at least 4kHz when sampling the voltage waveform of a three phase induction motor? I find most research papers use 4kHz but they don't state why. I want ...
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1answer
38 views

Input Voltage vs Output Voltage for a Shunt Positive Clipper with Bias Voltage

Assume voltage drop across diode is 0.7V in this case. From what I understand When V(input) is positive, but less than 0.7+V OR When V(input) is negative AKA When the diode is acting as open circuit:...
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4answers
3k views

What is causing this distortion of a pulse wave when recorded to a reel-to-reel tape?

I'm currently trying to record a pulse train used as a tempo clock for music instruments (e.g. output of Korg Volca 'sync out') onto my Fostex M-8 reel-to-reel recorder, with the aims to then ...
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3answers
2k views

Operating principles of a sawtooth wave generator bootstrap circuit

In one of my assignments, I was asked to explain the working principles of the sawtooth wave generator shown below. The input voltage is a spiked waveform obtained from a differentiator circuit. I ...
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3answers
107 views

Source voltage and voltage across inductor waveform

I did an RL circuit experiment. It is a series circuit with a potentiometer, inductor, and a DC source. Here is the resulting waveform at 2 different resistances (ch 1 is source voltage and ch 2 is ...
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4answers
75 views

Find the average power dissipation of the load

I have given the following voltage and current waveforms. I am required to find the average power dissipation of the load. I know \$ P_{avg} = \frac {\int_0^T \mathrm{v}\mathrm{i}\,\mathrm{d}...
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3answers
146 views

In BLDC sine commutation, why are the low and high of each phase inversions of each other?

In the diagrams that I have seen showing the PWM plots vs the sign wave of the high and low side fets for each phase of BLDC sine commutation, they are shown as being the inverse of each other: ...
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1answer
44 views

Waveform of a SR Latch [closed]

I need some help confirming what my answer sheet is indicating regarding the output waveform. So far, everything I have matches up with the answer sheet except the last peak from output 'U'. The SET ...
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1answer
73 views

Current wave form of an inductor

If this voltage is applied to an ideal inductor. How will be the current waveform look like? Kindly any one show me the graph for inductor current and if possible explain it. I shall be very grateful!...
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0answers
75 views

Sketching the voltage waveform of a capacitor

I'm currently learning about capacitors, Question: Ignore the fact that it says voltage on the figure, the question reused the waveform of a previous question. Since I = C(dv/dt), and C = 1 F, i ...
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1answer
73 views

How to model/get a capacitor to discharge slowly at first?

Typically, a capacitor discharges fast at first, and then discharging slows down until it approaches 0. Is there a way to slow the initial phase of discharging, so the capacitor does not immediately ...
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3answers
72 views

Is it possible for any circuit to independently make its own trigger, sweep or oscillation without the aid of an AC sine wave?

Even a Schmidt trigger, attributed to being able to create the start of an oscillating circuit, has to get its start from an AC sine wave. It seems that no amount of tubes or transistors can ...
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0answers
35 views

How to display Keyboard's binary to Digital waveform

How can I display to a monitor a digital waveform of any key when pressed in a keyboard? I was thinking to use an arduino or a raspberry. For example, when I press the small letter 'a' on a keyboard (...
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3answers
94 views

choosing best n points on sine wave for wave generation

I want to generate a sine wave using DAC+DMA. Currently, I have an example that generates a sine wave using DAC+DMA from an array of 60 points, at 8KHz. I want to be able to increase the frequency up ...
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1answer
56 views

Problem with waveform output .tr0 of hspice

I'm trying to see my project output waveform through CosMosScope but I get the error "The file format is not understood", while it gets job concluded in .lis file and simulate as well in avan waves. I'...
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1answer
59 views

Measuring 150kHz, ~30V peak waveform with good resolution

I am trying to choose test equipment for a systems test application and I am running into a road block with one of the specs I need to meet. The device features an H-bridge output similar to the ...
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2answers
102 views

Need help producing triangular waveforms

I've recently started using pspice and just created my circuit but don't understand how to do step 3 on procedures. I've created my circuit based on the second picture shown below (ignore my 10V). I'...
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2answers
117 views

74HC14 waveform question

I am trying to get more familiar with using a 74HC14, as an experiment I have an ldr set up in a voltage divider configuration and the center tap goes to the input of the 74HC14 input 1. I have all ...
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2answers
55 views

Non-sinusoidal waveforms: relationship (resistance, capacitance)\$\xrightarrow{\text{affects}}\$ (amplitude, frequency)

During the laboratory we have analyzed the following two non-sinusoidal generators: square-wave generator triangular-wave generator Sadly we didn't have enough time to complete the last task. My ...
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3answers
806 views

Spikes on a square wave of a oscilloscope reading

This question is not really a problem i am having but a thought that want to get off my mind. Usually on a reading on a oscilloscope especially on a square wave and sometime triangle waves, there are ...
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0answers
42 views

Is show waveform always referring to current?

In EveryCircuit, it allows you to "show waveform" for a particular component. For example: Does waveform always refer to the current that is going through that component or are there ever alternate ...
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2answers
135 views

How to make a sawtooth waveform look less like a staircase (DAC)?

I am making a 4-bit digital-analogue converter using an adder circuit with four inputs. Each input is a square wave of a specific frequency. The output of the DAC is meant to be a sawtooth waveform ...
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2answers
159 views

Anyone know this serial bus waveform?

I'm working decoding some house intercom devices to know when someone is calling and also be able to open the door. To do this I buffer the signal (some models has 15v, others 24v...) to a 3v3 level ...
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1answer
225 views

KiCad Simulation VSOURCE Triangle waveform

I want to simulate a second order active low-pass filter in KiCad, using the internal spice-based simulation tool. The input signal must be a triangle waveform of 30kHz and 0,5 V peak to peak, and the ...

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