Questions tagged [waveform]

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

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79 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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95 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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106 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
96 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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85 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
47 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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95 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
95 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
39 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
21 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
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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
80 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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67 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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112 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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40 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
64 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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63 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
61 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
70 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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34 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
79 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
30 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
57 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
77 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
102 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
47 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
354 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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41 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
93 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
150 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
141 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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4answers
170 views

Waveform for one byte sent over 3.3 V TTL

I have this question in my lab which I am not able to solve. It would be really appreciated if I could get some help with this. The question is: I need to draw the waveform for 1 byte sent over 3.3&...
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1answer
51 views

Current probe settings and measurement

I am having this Current probe I am using this to measure the inductor peak current. Inductor is rated at 2.05A. Schematics : Input Voltage to the converter during measurement is 7.5V I am ...
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26 views

analog linear ramp with external pulse trigger

I am a hobbyist working on a project that requires a linear ramp generator (0VDC to 5VDC @ 120Hz) that is triggered by an external pulse. The requirement for the external pulse is so that the ramp ...
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1answer
95 views

Waveform at the negative terminal of an OPAMP

I am trying to sketch the negative waveform of an OPAMP over here. I am not sure how to proceed with this as I have usually seen OPAMP with dual power supply. But this one have +9V and ground. My ...
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1answer
80 views

Lightning Surge Protector that complies with DO-160. Indirect lightning waveform, Gas Discharge tube or MOV in parallel with tvs

Would it be wise to put Gas discharge tube in parallel with tvs diode? OR Would it be better to put MOV in parallel with tvs diode? Also when deciding on tvs diode, how does indirect lightning ...
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41 views

ZMPT101B Voltage Module with Spikes in output Waveform

I am trying to use the ZMPT101B Voltage Module in order to measure AC Voltage .. I am trying to calibrate it, but when I see the output waveform in the oscilloscope, there are spikes all over the Sine ...
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2answers
87 views

Finding the waveform of current in a circuit

How do you find the waveform of current i1(t) in the following? Do I need to find the capacitive and inductive reactance then find the current i1(t)?
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65 views

writing Keysight Binary Arbitrary (.barb) waveforms

Keysight 33600 waveform generators load waveforms in either .arb (ASCII) or .barb (binary) formats. For large waveforms with more than ~10M samples .barb load much faster. How can I create .barb ...
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1answer
78 views

Finding a Fourier series of a Burst Fired sine wave having consecutive 2 cycles on & 2 cycles off?

I have been trying to find the solution of the following problem but with no luck. I have a system that generates a waveform of sinusoidal type with the only difference being that this wave has 2 ...
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2answers
112 views

discrete triangle generator

I am trying to design a convertor from analog to PWM with very good THD as in this http://www.ti.com/lit/ug/slau508/slau508.pdf The triangle generator (fig 2) (I am trying for 750Khz to 1Mhz) is a ...
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3answers
201 views

How to cut or remove the unwanted waveform?

I want to remove unwanted signal at particular time from the input signal. But I am not sure how to start this. I used capacitors to reduce the unwanted signal. It worked OK, but not well. By seeing ...
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1answer
136 views

Half Bridge with PWM- gate signal problem

After making a half bridge inverter using a square wave (I asked a question on this website about it previously) I have now decided to use PWM signal in order to obtain a sine wave output and have ...
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2answers
144 views

Waveforms from a Function Generator, What is Good Enough?

I got an HP3311A function generator. The Sine wave forms below looks pretty bad to my eyes. Is it normal?
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160 views

Diode sine wave shaper - location of break points

I'm attempting to generate a sine wave from a triangular wave using the diode breakpoint method where the sine wave is approximated by multiple straight-line segments. Where should the breakpoints be ...
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4answers
1k views

What units are kpts?

I am parsing data from a Siglent SDS2000X oscilloscope. The first chunk (0x00 - 0x003) is for wave_length. The data sheet ...
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1answer
410 views

SPI waveform on Raspberry Pi is not clean, and I'm wondering why

I have a Raspberry Pi Zero Wireless and I wish to connect it to an FPGA via SPI. I have done some SPI tests with my 100 MHz oscilloscope and see the images shown below. The Raspberry Pi ...
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4answers
80 views

What is the difference between using an USB Logging Software and Logic Analyzer for signal sent to the printer?

In my recent pursuit in exploring the workings of an inkjet printing head, I need information like the default firing voltage and waveform set by the printer's manufacturer for different instructions ...
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30 views

Making a common ground connection between a DC power supply and a waveform generator(33120A)

I would like to use a DC power supply to as a source voltage to a sensor and a waveform generator(33120A) to give another input to the sensor. I would like to know how can I make a common ground ...

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