# Questions tagged [waveform]

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

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### MOSFET rectifier is outputting a strange waveform at higher voltages

With the help of the people who commented on my last post, I finally got my MOSFET rectifier to work! Couldn't have done it without you! After some tests, I noticed that the waveform begins to get ...
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### Is there a fix/mod to accelerate drawing waveforms in LTspice

LTspice is very slow to draw the waveform window. This can be so extreme, that the software spends the entire time trying to rescale/redraw the graphs, especially for busy waveforms for things such as ...
• 22.5k
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### Circuit analysis for DC-DC convertor SEPIC architecture

I'm analyzing the following reference design from Texas instrument for making a variable dual output (+/-60V form 11V): What I'm curious to know is to understand the signal waveform for the following ...
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### How to distort a square waveform to get even harmonics?

I'm using a microcontroller with internal 12 bit DAC (buffered output, capable of 0-3.3 V) to produce an analog output consisting of variable amplitude square waves (0-270 mV) at a narrow audio ...
500 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 ...
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### Reading ECG wave data from .dat and .hea file from SD card with Arduino DUE to produce it on DAC pin

I am trying to produce an ECG wave on the DAC pin of the Arduino DUE. Here are my setup details. SD card is attached to Arduino DUE with SPI connections. I have 2 files (.dat and .hea) of ECG data on ...
86 views

### How to properly trigger and measure a modulated square wave signal with an oscilloscope

I'm having trouble getting a stable trigger on my Rigol DS-1202 oscilloscope for a complex waveform. The waveform is composed of a 25.5kHz carrier square wave modulated by a 200Hz square wave, both ...
187 views

### Partially nice waveform on debugger pin

I am looking at the waveform on my SWDIO pin during programming and most edges look very nice, but some do not. Is this likely to be problematic? What are probable causes?
22 views

### Determining Suitable TRMS Voltmeter Specs for Modulated Signal Measurement

I'm seeking advice on selecting a TRMS (True RMS) voltmeter suitable for measuring the voltage across a resistor with a modulated signal. Here's the scenario: I need to measure the TRMS voltage across ...
111 views

### Is there a way to get rid of voltage clippings across a load, so that the voltage output waveform across it is a sine wave?

So, we've been assigned to simulate a circuit to drive an 8ohm 0.25 watts speaker/load with a 3V voltage supply (DC) and a test input of 300mV peak-to-peak, 1kHz zero-offset sine-wave. (No additional ...
43 views

### Welder not passing current from a short pulse

I am trying to use a 5V control signal to operate a solid state relay (datasheet below) https://assets.rs-online.com/v1698808049/Datasheets/e3347be1ffb933a5483cd852b7d90659.pdf Once open, I would like ...
1 vote
74 views

### Voltage doubler waveforms

A voltage doubler is connected like this (the voltage source in series with the inductor simulates transformer output): After stepping the load (100k, 1M, 10M, 100M, 1000M) the waveforms look like ...
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### What protocol is shown in these scope traces?

I have a PIC16F1937 series processor on a fire detection control card. I receive the output signal through Rx connections. I cannot figure out the protocol despite all my attempts. The signals present ...
70 views

### Integrator waveform problem [closed]

I am doing a school assignment that requires me to design a stable Integrator circuit. But after I completed the design, I found that the peak value of the output waveform (blue line) was unstable. Is ...
119 views

### Is this modified or pure sine wave...or something else?

I have a 12 volt dc to 120 volt ac inverter built into my custom van. I've been curious if it produces a modified or pure sine wave because I have a need to occasionally plug a ebike battery charger ...
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### AD2 waveforms oscilloscope data logging question

Does anyone know a good way to log oscilloscope data for a specified time duration using Waveforms software and an AD2? I am trying to read a raw signal with the oscilloscope function in Waveforms ...
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### Full wave rectifier 2nd and 4th waves doesn't go up as it should [duplicate]

I'm using four 1N4007 diodes and one 15k resistor. I already changed diodes and cables dozens of times, it doesn't change, even I change the oscilloscope or arbitrary function generator, nothing ...
87 views

### How to ramp a bi-polar Return to Zero (RZ) digital waveform

I am using a Raspberry Pi Pico and a few op-amps and resistors to implement an ARINC 429 transmitter. ARINC 429 is a bipolar RZ serial communication protocol commonly used in avionics. See the image ...
247 views

### Getting a square wave as a output of op-amp

I have the following op-amp circuit and i am trying to find out what is the open loop gain. In order to make this simulation properly, we need to make sure that the DC operation of the amplifier is ...
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159 views

### Why is the output voltage (without capacitor) of a boost converter seen as a perfect square wave?

I am trying to learn about boost converters, but I don't understand why the images of the voltage output always seems to be like a square wave PWM. I understand that assuming perfect inductors, the ...
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### Improving waveform shape in discrete Pierce oscillator with Schmitt trigger output

I am making a simple clock source using discrete Pierce oscillator with its output attached to high speed Schmitt trigger buffer to get square wave in the final output. I got the circuit for the ...
1 vote
259 views

### Problem generating two asymmetrical pulse waves

I am trying to generate two pulse waveforms with a on to off time ratio of around 40/60. The max amplitude is only 5 V however the switching frequency is quite high at around 100 kHz. The two ...
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225 views

### PFC Boost with LT1242

I have tried a PFC Boost simulation with lt1242. The specification is Input Voltage Range = 90 to 264 Vac, Output Voltage = 400 Vdc. I have got the result but I am not sure does this make sense at all ...
72 views

1k views

### Square wave generator without op-amp

I am trying to make a square wave generator but don't have an op-amp nor the PNP transistor to do it. Is there any way that works? I have tried using this one: simulate this circuit – Schematic ...
1 vote
3k views

### 50 Ω or high-Z setting on waveform generator?

I have an arbitrary waveform generator that allows me to set the load as 50 Ω or high-Z. This generator is connected to an amplifier that has as input an unbalanced BNC connector, 10 kΩ, single-ended. ...
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1 vote
748 views

### Why does the amplitude of my output signal increase when I increase frequency of the input signal?

The signal generator outputs a sine wave into an LED which emits light onto a photodiode. The photodiode is connected in a TIA circuit and then the output is displayed on an oscilloscope. The ...
• 161
455 views

### Is it normal for a square signal to change into a sine shape at high frequencies?

The signal generator outputs a square wave into an LED which emits light onto a photodiode. The photodiode is connected in a TIA circuit and then output is displayed on an oscilloscope. The output ...
• 161
1 vote
231 views

### Quality Check of a Brushless DC motor on an oscilloscope

I am Quality Checking some BLDC(Brushless DC) motors with an oscilloscope by connecting the BLDC to a drill, running it and viewing the output on my oscilloscope. I have been checking the Vpp(Peak to ...
1 vote
54 views

### Effects of ferrite isolator on waveform

I have recently measured the standing wave signal from a waveguide. I notice that as the frequency is lowered the signal tends towards a sawtooth wave. ** My guess for why this happens is that the EM ...
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### UTG900E output specification

The datasheet of UTG900E Waveform generator says it can output up to 10 Vpp on a 50 ohm load, but in chapter 3.3.1 is stated the load can be set between 1 and 999 ohm. Nowhere in the datasheet I see ...
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1 vote
348 views

### Spikes on IGBT's turn-on waveforms

Here are the ideal IGBT turn-on waveforms and the actual waveforms from my own gate driver. What causes the spikes on the actual waveforms at t0? Idealized gate turn-on waveforms IGBT Turn-on ...
1 vote
210 views

### Generating sawtooth waveform

I am trying to generate a sawtooth waveform between 0 and 1 which would have a frequency upto 200 kHz. I run this piece of code within a Matlab function block - it works fine up to 10 kHz, but higher ...
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### Using RC lowpass filter at the MCP4802 DAC output (Arduino Nano waveform generator) [duplicate]

I have code on Arduino Nano that has predefined array of 4 waveforms (square, sawtooth, triangle, sine). The array has, for each of the waveforms, 256 values where each value is 8 bit. The speed, at ...
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### 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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700 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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2k views

### What protocol is this waveform?

I'm trying to reverse engineer a communication line between two components. However for debugging I'm connecting to only one of them, powering it up and looking at the signal. I have no experience ...
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### How to deal with incorrect optical encoder waveform?

Summarize the problem: TLDR: I am having trouble reading the signals from an optical encoder to track the position of a stepper motor(I know that it’s redundant to use encoders on stepper motors. It’s ...
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622 views

### TL072 weird output when used as buffer

Dear all, I tried to use TL072CP op amp as a buffer, however to my surprise it outputs a perfect triangular wave with reduced amplitude when given sine wave input of 150kHz and I have used a 12V and -...
125 views

### Current through MOSFET of ideal forward converter

I am asked to sketch the current through the MOSFET of an ideal forward converter. I simulated a forward converter in LTspice and found that when the MOSFET was on, the MOSFET current and input ...
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263 views

### How to generate waveform values for storing in an EEPROM?

I need to program an old EEPROM with 16 different waveforms: triangle, rectangle, sine, etc. Is there a method that can encode a given waveform into an array of values like you can do in a spreadsheet?...
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1 vote
279 views

### Using a SSR for passing a DC PWM Signal that has positive and negative waveform

I am trying to control the PWM signal to a solenoid via an SSR by passing one leg through it to control the on/off. I have tried 3 different SSR's and none of them fully stop the signal, I still get a ...
573 views

### Op-amp triangular wave DC offset

I want to generate a triangular wave that has no negative component using op-amps. The method I am employing to generate the wave form is described here, and can be seen in this image: As in the ...