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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21 views

300ns Pulse Generator to Drive LED

I wanted to use a 555 timer in astable mode to generate a 5V signal to flash an LED on and off. This works fine when the pulse length of the LED is in seconds or milliseconds. But this got me thinking ...
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106 views

Amplifying pulse from 4 V to 24 V

I currently have a problem where I want to amplify a 4V square pulse signal to a 24V square pulse signal, for a Q-switch input. I tried using op-amps (LM358N) in a non-inverting amplifier ...
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28 views

Two pulse to create one pulse circuit

I have two pulse quick outputting of an Op Amp at a particular voltage. What I am trying to do is have an output pulse to trigger at the first rising edge pulse and fall at the second rising edge ...
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what is the output for sine wave generator, square wave generator and PWM circuit? [closed]

[![Given below is the circuit for a pulse width modulator][1]][1] What is the output waveform of the sine wave generator, square wave generator and PWM circuit of the given circuit below. NE555
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45 views

How I can read optical encoder pulses on High RPM

I am working on a project in which I am using two DC motors with encoder but after certain speed ( my DC motor operating voltage is 24 V but when I give it more than 15V )my MCU CC1350 start missing ...
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95 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
55 views

PIC 18F4550 capture mode

I would like to measure a pulse using the PIC 18F4550 in capture mode. This pulse is generated by the PIC microcontroller itself. For this, I use a function which plays the role of the XOR logic gate (...
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81 views

What type of relay/switch device am I looking for?

I want to control a 24V primary device based on a digital signal from a secondary device. The secondary device emits a periodic pulse when I want the primary device to be ON and no periodic pulse is ...
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1answer
48 views

How to linearly boost the output of a Gaussian shaping amplifier?

I have a pulse detection set up that takes in analog pulses (with relatively long tails, gamma spectroscopy). This pulse is sent into a shaping amplifier, that removes the tail, and shapes the pulse ...
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2answers
44 views

Inappropriate readings of pulse and temperature sensor (LM35)

I am facing quite a bit trouble with an LM25 temperature sensor. The readings are a bit too high (90-120*C) for room temprature. I have tried thefollowing things to get an expected result but none ...
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76 views

How to surpress coupling between two circuits

I have the following setup: 2 piezo transducers are placed 0.7 meter apart from eachother in water facing eachother. 1 piezo (PA) acts as the sender, the other piezo (PB) acts as the receiver. PA ...
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49 views

One shot pulse generator Low->High->Low even if button is still pressed?

I am trying to use a 555 IC to create a low-high-low pulse that will trigger only once and still go low even if the button continues to be pressed. This is the ...
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3answers
60 views

How to implement a continuously scanning multi-channel system in Verilog

I currently have a multi-channel system where each channel is receiving a pulse at different times. I want whichever channel receives its pulse first to act as the reference to then measure the time ...
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Is a high open circuit voltage still beneficial when you have a high voltage/frequency pulse arc starter?

In welding, I know a high open circuit voltage is a major factor in the strength/quality of your arc when you scratch start, but how much of a factor is it when you have a pulse starting mechanism? Is ...
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48 views

Optical pulse sensor not producing a clean TTL pulse

I have two of these optical pulse sensors monitoring LEDs on my electric and solar meters - Optical Pulse Sensor - Github The first sensor outputs nice TTL pulses at 5V, the second sensor outputs ...
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Calculating power absorbed by time varying unit step souce in pspice

I am new to Pspice and I am encountering a problem. I want to find the power absorbed at specific given time lets say t = 0.1s using pspice. I have the following circuit with a time varying source. I ...
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39 views

High frequency detection for missing pulse issues for a high freq. pulse train

I know opinion based questions are not welcome but for a project I need to monitor 2MHz pulse train with 1ns ON times. Basically I need to monitor rising edges and if let's say the pulses are not 2MHz ...
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1answer
35 views

How does pulser-receiver circuit work

I want to set up an experiment exactly as given in this data sheet for the T/R switch that I recently bought (the MD0101): Every pulser receiver circuit that I’ve found neglects to address what ...
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35 views

Interrupt trigger on presence of a pwm signal

In order to detect the presence of a pwm signal using a microcontroller from an external sensor (an interrupt), say the sensor is a hall sensor rotary encoder that is used to count the number of ...
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1answer
54 views

Practical ways to associate a known pulse to an adequate oscilloscope bandwidth

Is there a rule of thumb for a scenario for deciding minimum required scope bandwidth whew we have a known pulse train of 5MHz repetition rate and each pulse has 1ns pulse duration? I know that these ...
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30 views

How to calculate the voltage at the OUT point in this PWM creator

This is a Circuit for creating a PWM signal,I have the results but I wanted to know how I come to this results,because I dont really know!Thank you!Here DC=50%,what about DC=75%.Please help!!
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6answers
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Vintage germanium transistors: How does this metronome oscillator work?

I'm trying to restore and learn from a simple metronome assembled by my uncle in the 60's. It has a nice sounding beat and used to work until very recently — although unstable. I've ...
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1answer
84 views

Routing a HV Pulse onto a PCB

I have designed a circuit to provide pulses with a slew rate of 3kV/50ns. The pulse train is made up of N successive pulses with duty cycles of 10us on 40 us off repeated at 2 Hz. My challenge is to ...
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103 views

High side switch load isn't working as intended per datasheet. The output is always high at 12V

I bought a high side load switch from Mouser, and per the datasheet, I added 13kohms for R1, connected Pin 1 directly to GND. The input (ON/OFF) at Pin 5 is a 5V pulse with a frequency of 20Hz and the ...
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7answers
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How do I make a nanoseconds counter?

I want to make a counter that can count the time between pulses in nanoseconds. The counter starts to count when a pulse enters a pin (at the start of the pulse) then stops when a second pulse comes. ...
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3answers
43 views

Stepper Driver pulses control (with Arduino)

I intend to control the speed of a stepper motor thanks to a driver connected to Arduino (Mega). Basically the driver has, among others, 2 pins, PUL+ (Vcc) and PUL- (GND, common cathode), and each ...
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100 views

How to properly drive parallel analog switches (variable capacitive loads) with opamp(s)?

So as you can see I have 16 SPDT switches on one side of my 16 'RUT paths' and 16 SPDTs on the other side. Each SPDT(ADG1434) has two source pins (SXA and SXB) and a common drain pin (DX), 'X' ...
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2answers
151 views

Programmable gain Transimpedance amplifier for 4-5 decade resistance measurement using Pulse voltage/current

As you can see from my previous question, I am trying to measure resistance within the range of 200k-60 ohms (around 4-5 decades). I will be using a pulse (5us pulse width and 50ns each rise and fall ...
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36 views

Spectral properties of QPSK modulation

From what I've read, the spectral properties of the modulation largely depend on the rate of change of the signal phase - "a signal in which the phase changes stepwise has a broad spectrum, well ...
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4answers
151 views

Why are these 0Ω resistances for?

I was studying this circuit which is for a ±100V 3A pulse and noticed these 0-ohm resistors. As far as I knew, the use of these resistors was usually to pass over other traces considering a low ...
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1answer
49 views

Optimising a single pulse precision peak amplitude detector

So I made this precision peak detector circuit (with reference from EEVblog's video and experimenting with the resistor/capacitor values), with which I want to measure the peak amplitude of a single ...
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31 views

How to protect power supplies and pulser in DC bias + high voltage pulser combined circuit?

I am building an electric circuit in which a DC bias power supply and a high voltage pulser are mixed. I need to save each one from the other with proper safety measures. I have researched several ...
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64 views

Which is the best way to get 16-channel simultaneous sampling ADC interface with an FPGA (Zedboard)?

I have an application that requires me to measure the amplitude of 16 different one-shot pulses (on 16 different lines) simultaneously with an FPGA (Zedboard). For each pulse, the pulse width would be ...
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3answers
43 views

Confusion about the meaning of Bandwidth-limited pulse

I am quoting Wikipedia: “A bandwidth-limited pulse (also known as Fourier-transform-limited pulse, or more commonly, transform-limited pulse) is a pulse of a wave that has the minimum possible ...
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1answer
37 views

Connecting Geiger Counters in Coincidence

So for this Geiger Counter kit from mightohm (https://mightyohm.com/blog/products/geiger-counter/), does any one have any suggestions for what circuits to build to connect two detectors in coincidence?...
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3answers
1k views

How to build an arbitrary (one-shot) pulse generator?

I need a circuit/IC that can generate a single pulse with a variable pulse width (I would want a minimum of 50 ns but if that is not possible the next minimum can be 1 μs, and even if that is not ...
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1answer
39 views

Trouble understanding a given circuit for an LDR pulse sensor

I'm a second year physics student, part of a group, and we're trying to build a pulse monitor following this guide. This is the schematic I'm having trouble to understand: I have basic knowledge of ...
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84 views

Create differential signal from single ended encoder

I have a problem with the output of an DC motor encoder feedback. I have an 5v single ended encoder (AB signal), but my control needs an differential signal. I am not sure how to do this as I have no ...
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2answers
83 views

Time domain reflectometer looking for faults

I have a TDR with a sampling frequency of 200MHz that equals 1 sample very 5 ns. When I use a really long square wave the response will look like the left plot. Where delta t is the time of ...
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2answers
290 views

Very short rise and fall time with relay

My question is related to the question here. I need very fast rise and fall time (below 2ns) and pulse width of 50ns. Load is 50ohm and voltage is 250V. I have achieved the rise time with a mercury ...
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1answer
137 views

nanosecond electronic pulser circuit - up to 100MHz

I would like to create a circuit which creates nanosecond pulses for a trigger signal with a frequency from 20 to 80 MHz, at 3.3V. I have created the following cricuit as can be seen in the attatched ...
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1answer
47 views

time domain reflectometry pulse shape

Alot of TDRs use square waves or needle like pulses for length determination. Why are not other pulse shapes like sine or triangle used?
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34 views

Getting negative pulses from avalanche mode transistors

Using a BJT in avalanche mode is a known way of generating very fast short pulses. Rise times and fall times can easily be sub nanosecond and amplitudes of many volts are possible. Orthodox circuits ...
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54 views

Adding delay to pulsed signal in matlab code with PWM block

How can I generate a pulsed (rectangular) signal such that, total period = 500ms (simulation time); clock frequency = 10kHz; pulse should occur every 20 ms. Duration of the pulse is the clock period ...
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65 views

How to calculate this capacitor value?

How to calculate this capacitor on pulse transformer primary? I've tried 470 nF but the PWM on capacitor's output lost its level, normally both PWM are 0 to 12V, but when I put this cap, the PWM on ...
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60 views

Fast rise time reed relay

I am currently working on a project related that I asked before here. The purpose is to have 2ns rise time 30ns pulse width at 250V (with 50ohm load). Repetition is 30hz. I tried avalanche transistor ...
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1answer
370 views

MOSFETs in high voltage low current applications

I am constructing a circuit designed to release a very brief pulse of current at a voltage of 1000V. A low power DC converter is used to charge a 0.1uf pulse capacitor to 1000V, and then I intend to ...
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1answer
266 views

What design should I use to clean up this pulse wave?

I'm using common voltage controlled oscillator IC - AS3340. It has some problem with pulse wave output on higher frequencies. The bottom of falling edge looses sharpness the higher I go. This is how ...
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1answer
49 views

best high pass filter topology to extract low V kHz range pulse from noisy 60Hz line voltage before daq

I need to extract a 1 kHz-10kHz range voltage pulse created by a current pulse I inject on an harmonic rich 60 Hz network and that propagates on it. The line voltage is 120V AC. harmonics 2 and 3 are ...
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68 views

How is a magnetic field generated by an inductor when supplied with a pulsed current (pulse induction)?

My question relates to pulsed induction (PI) metal detection in particular. It is my understanding that in a DC circuit an inductor acts as a conductor with little to no energy stored in a magnetic ...

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