Questions tagged [pulse]

A pulse in signal processing is a rapid, transient change in the amplitude of a signal from a baseline value to a higher or lower value, followed by a rapid return to the baseline value. There are many examples of a pulse function including: Step/rectangular pulse, impulse/dirac pulse, triangular pulse, sawtooth pulse, sinc pulse, Gaussian pulse, etc.

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How can I boost the output current of this pulse generator (LF353, supplied with ±15 V) to above 25 mA?

I have a pulse generator design. Everything works fine, but it is required that the output current is above 25 mA. (The 9.69 kΩ is just a variable resistance to modify the output frequency.) ...
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3 answers
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Why is my op-amp pulse generator (LF353) delivering way less voltage (±2 V) than the voltage supplies of the amplifier (±15 V)?

I had to design the following circuit as a pulse generator so that if I vary the resistance the frequency will vary as well. It's defined by the frequency expression: $$f=\frac{1}{2R_4C_1\ln(3)}$$ ...
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Relationship between pulse forward current vs pulse duration

I'm having trouble understanding why this application note for this proximity sensor suggests reducing the current for the IRED depending on the on time pulse duration. What is the relationship ...
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Reading pulse count using Raspberry Pi in Python

I have been trying to read the number of pulse inputs from an external device. The pulse generated is from the Arduino Uno, and the pin I am using has a frequency of 450 Hz with 5% duty cycle. Every ...
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Multiplication of pulse trains

Suppose I have two pulse trains, with pulses some tens of nanoseconds apart and long (evenly spaced and equally for both of them). Each of the pulses has some amplitude \$v_n\$ in one train and \$v_n'\...
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Output with programmable rise time

I am tinkering with a device to generate pulses for a measurement setup. No need to buy it: Just wondering how one would implement it. Idea: Device generates a square-wave (Vpp and DC-offset) output ...
1 vote
1 answer
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What component is needed to collect injector pulse?

I am planning to convert this pulse to a digital signal (apx. 5 V for MCU input) based on voltage level. The maximum voltage of this pulse is 12 V when the injector nozzle is closed and 0 V otherwise. ...
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Hall-effect pulse input to transistor for relay switching

I have a Hall-effect sensor on a water flow meter. I want to switch a pump on when if there is flow (Hall-effect signal). I was thinking of using a RC circuit on the base of my transistor that ...
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Pulse generation using Timer counter in ATMEL SAM3x8e Arduino Due

I am using the ATMEL SAM3x8e chip on an Arduino Due. I want to generate two pulses of frequency 100 kHz of the pattern shown below (1 period shown). For this I used TIOA8 and TIOA0 lines in the ...
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Why does a MOSFET or IGBT's surge current rating stop increasing with decreasing pulse width beyond a point, unlike thyristors?

Thyristor The surge current rating of a thyristor increases as the width of the pulse decreases. For a single non-repetitive pulse, it's not uncommon for a thyristor to have a surge rating that is 10x ...
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Reducing the signal frequency

I have a sawtooth signal: roughly speaking, the duration of the "tooth" is 1 ms. Is it possible in the analog world to thin out this signal? For example, leave only every third, tenth "...
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i2C controllable pulse generator [closed]

I am trying to build circute where I can generate single pulse having width ranging from 1ms to 50ms and I would like to be able to control the width via i2c. what I have done so far was using LED ...
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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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How to do a pulse generator whose pulse width is controlled by a voltage measured in proteus without using a microcontroller or an analog circuit?

how are you?. I'm trying to emulate the behavior of the HC-SR04 distance sensor in proteus but using variables. I succesfully could make a simulation of a water tank whose level is indicating by the ...
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Time-adjustable pulsed power debug tool

For debugging DC thermal failures, I'd like to be able to limit power duration to be roughly in the range of 1ms to 5000ms, adjustably. Here is one obvious way to do this: You can assume that I have ...
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Floating high-side thyristor switch is destroyed by massive gate voltage undershoots

I'm building a capacitor discharger with a thyristor for high-voltage impulse generation into an inductive load. To make the circuit easier to use, I wired the thyristor as a high-side switch. Then I ...
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3 answers
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High voltage, high current pulse pulse power supply

How do high voltage high current pulse power supplies work? For example in electrical discharge machining (generating sparks that remove metal,) a single square pulse can be as small as 1 microsecond (...
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1 answer
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Forcing multiple-quadrant TRIAC operation through gate ringing

I got the possibly hare-brained idea to cause a single TRIAC gate pulse to go positive and negative, and thus fire in (maybe not all four but) more quadrants: ThecLTspice simulation seems to show ...
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Signal identification: What serial protocol does my desk use?

Can anybody identify what kind of signalling protocol this is? I'm sampling at 2 MHz. Here's the first falling edge of the signal, with a default UART protocol decoder for reference (8 bits, no parity,...
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I want to divide a pulse in time axis and create more pulses

I need help with my project. I want to split a pulse on the timeline. I want to take the signal and divide it by 58 μs. Actually the time of the output signal is not important. I just need to generate ...
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Is the pulse voltage MNA matrix stamp the same as a normal DC voltage?

I am currently doing research on circuit simulators and trying to understand their techniques for simulating specific components. Now, I am at the state of trying to do transient simulation using ...
2 votes
1 answer
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Detecting 100VDC using Arduino or Pico at 3.3V

I am trying to make a rudimentary energy metering system for my workplace. We have several Countis E50 meters in place which feature a pulse output. The output is 100VDC at 0.5A. What I would like to ...
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Verifying the Measurement Precision of a Circuit

My aim is to build an electronic circuit that allows me to measure the relative precision of the energy of optical pulses in the order of 10^-6. The optical power of the laser pulses is measured with ...
2 votes
1 answer
163 views

Simulating an avalanche pulse generator in LTspice

I need to create a very short (<1 ns) pulse and control the pulse frequency between 1 MHz and 10 MHz. One method to create short pulse I came across is Jim Williams avalanche pulse generator. ...
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Retriggerable monostable multivibrator IC down to 500ps

I want to generate a fixed 0.5ns 5V electrical pulse where I can modify the repetition rate from 1MHz to 10MHz. Some laser diode drivers or high resolution function generators can achieve this but ...
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How can I make a circuit that works like a pushbutton without a pushbutton?

I am trying to make a circuit that would do the job of pushing a pushbutton just once but without a pushbutton in order to make it automatic. A sensor activates it, and a latching relay circuit gets ...
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Dispersive delay line output and convolution is same or not?

I am trying to simulate chirp radar receiver with SAW filter (DDL) used in it. I struggle with formula for DDL output. I couldn't find it anywhere. As far as I understand convolution is flipping and ...
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Why does norm of the PAM bandpass signal give energy of the pulse over two?

I would like to understand why \$\int_{-\infty}^{+\infty}g^2(t)cos^2(2\pi f_c t)dt = \mathcal{E}_g/2\$ \$g(t)\$ is a pulse of duration T. the background is: reading the book "Digital ...
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Clock Generator with Variable Pulse Width Design Help

I'm working on a design that requires a clock generator with variable pulse width. The pulse width is controlled by a potentiometer, and the clock speed is controlled by another potentiometer. It's ...
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How to drive this specific laser

I've done just a circuit to drive an old laser and it was like this one: I was wondering if it could be suitable for driving the laser whose datasheet is reported below. I have these requirements: ...
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Circuit to light up LED only once

I have a battery-powered product with an ON/OFF switch with two leads. I am looking for a circuit to shine a LED for a short duration each time the switch goes from OFF to ON. Power consumption and ...
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When calculating the energy delivered by a pulse in an oscilloscope, what is the uncertainty in the timestep increment? [duplicate]

I am trying to calculate the energy delivered by a short electrical pulse. I am using an oscilloscope to capture the waveform and then exporting it to a CSV file. My scope took measurements at a rate ...
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Compensation pulse for plateau through bias-tee

I'm sending a series of square pulses through the RF side of an homemade bias-tee (R = 1e6 Ohm, C=0.1uF). Unfortunately, my experiment requires that some of those pulses have plateau time longer than ...
6 votes
4 answers
573 views

How to make a TTL low pulse of 100 ns to 1 μs with a simple RC on a 74LS04 inverter?

I APOLOGIZE THAT THIS IS GETTING LONG-ish. There are many updates at the end, and I begin editing the original to bring some finding and WARNINGs into it. BACKGROUND I am building myself a Z80 ...
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1 answer
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Why LC rings without ground but doesn't when grounded?

New to electronics, 1st experiment, just bought all this stuff to start, so apologies in advance for inaccuracies. I'm trying to have Arduino detect resonance frequency of an LC circuit, unknown mH &...
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How can I shorten the width of a pulse?

I am exploring ways to shorten the width of the ON-time of a PWM signal while keeping the switching frequency constant. I intend to use S1 as the signal to the Enable/Disable pin of a gate driver IC ...
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How to generate a single pulse signal with existing clock signal

There are 2 input signals to the circuit. one is the clock signal of 1MHZ. the other one is the 'input'. Making use the clock signal, how do I generate a single pulse when the input signal changes ...
2 votes
2 answers
101 views

How do I achieve well-formed pulses in a Dickson charge pump?

A picture is worth a thousand words, and I tend to make a lot of mistakes in my words, so, first picture, the circuit in question: I know the Dickson charge pump looks a little different but it is ...
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How is Pulse Density Module (PDM) signal driven?

I am confused between Pulse Width Modulation (PWM) and Pulse Density Modulation (PDM). From my understanding, both are used to transmit a digital signal into an analogue domain. It is basically doing ...
3 votes
1 answer
67 views

Resistor Power Rating and Pulses

I'm really confused with resistor power rating and pulses. I'm trying to determine the power rating of a resistor that will receive pulses of potentially 40 volts for 15 milliseconds. During this ...
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1 answer
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Unexpected result when using RF pulsed generator in ADS

I am simulating a simple test circuit including an RFpulsed generator in ADS, but the simulation gived some surprising result. I have attached my test circuit schematic in the attachment. Moreover, I ...
1 vote
3 answers
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Can V²/R be used to find energy of a DC transformer pulse?

A person I am working with is trying to determine the efficiency of a pulse transformer and I am confused by the procedure. We know the input energy because a capacitor is discharged across the ...
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Change the duty cycle of pulses

I'm trying to raise the duty cycle of short pulses (about 10%) through the range up to ideally 80% using a potentiometer. I've seen variable pulse generator designs using 555s, but my trigger is ...
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How is there a voltage on the secondary coil when di/dt=0 on the primary coil?

I have made a simple pulse transformer circuit in LTSPICE using a pulse and two coupled inductors. L1 has a resistance of 1 Ω and L2 has a resistance of 0 Ω. I am having trouble understanding why this ...
2 votes
1 answer
106 views

How to achieve signal gating with trigger input

I am currently working on a project that generates enable pulses of extremely diverse lengths from microseconds to days and under normal operation will start execution under a trigger input. However, ...
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Recommended modelling software for 200 μs pulse width pulse transformer application

I am looking to model a HV pulse generator that involves discharging a 6 μF capacitor at about 300 V across the primary coil of a transformer. This discharge happens about once every 1.5 seconds. The ...
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3 answers
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Diode reverse recovery time and the speed (snap back) in which recovery takes place

I'm looking at generating a circa 1 nano second current pulse by utilizing the snap-back time (usually measured in the tens of pico seconds) when a diode is "forcibly" reverse polarized ...
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MOSFET Driver input frequency

Can I send pulse 1us (1Mhz) to VOD3120AB Mosfet Driver?
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125 views

Turn signal detector

I'm trying to figure out the simplest design possible. I want a video camera to activate on my truck when I activate either left or right turn signal. Each side mirror has its own camera. So basically ...
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2 answers
87 views

Logic analyzer gives me much more pulses than expected

Let me start the question by saying that I am using a logic analyzer for the first time, so I am probably doing something wrong. I sniffed the signal that goes to a speaker. The signal is probably PWM....

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