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

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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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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32 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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33 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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605 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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35 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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54 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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77 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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259 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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121 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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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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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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25 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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62 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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39 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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193 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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246 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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45 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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60 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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62 views

Toggle Flip-Flop for Voltage Higher than Logic Levels

I need a T flip-flop for 24V. The purpose is to take a 24V 50% duty cycle 0.5Hz pulse wave and halve its frequency to 0.25Hz, so that the output wave toggles between 0 and 24V at the input's rising ...
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60 views

555 timer unstable pulses

I'm using a 555 timer to drive the clock of my circuit. However, even with capacitors from VCC to GND, and from Pin 5 to ground, I'm still getting this "bump" when the timer transitions from ...
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83 views

Why does the PMOS burn out in a buck boost converter when I increase the power supply voltage?

My MOSFET warms up and even burns out when I change the power supply to 8V. I get an input current of 1A , and the MOSFET burns. This is the datasheet. I dont know why. I have an IRF9540n MOSFET. ...
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106 views

Fast switch rise time techniques

This question is continuation of this question: High Frequency Square Wave Generator I am trying to drive a 400V supply and 50ohm load with an RF MOSFET which has a rise time of 3-4 ns and fall time ...
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50 views

How to make a constant current-pulse current charger for lithium ion?

I've been doing some research about battery charging system with the CC-PC-CV (constant current-pulse current-constant voltage) method. However I have some questions and need some guidelines for ...
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47 views

How do I build an RC-base negative edge detector, that makes a low pulse on a falling edge?

I keep coming back here searching for an RC-based negative edge detector for TTL levels, that generates a negative pulse on a falling edge. The only place I find this solution is a certain spot in a ...
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34 views

Measuring average DC of pulsed analog signal

I'm trying to measure average DC level of pulsed analog signal. The pulses have minimum pulse width of 10 us and amplitude of max 5 V. Pulses are somewhat gaussian shape and have very random height ...
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65 views

Circuit to generate a very short pulse from long pulses is not working

Here is a simple circuit I found recommended on here for generating a very short pulse from longer pulses (in this example from a switch) However it isn't behaving as expected when resetting a CD4017....
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37 views

How Does Osram Measure Pulse Handling Capacity?

Looking at datasheets like the SFH4641 from Osram, I noticed the pulse handling capacity diagram, and although I hadn't really thought about it before, I don't know how they measure that. Niavely, ...
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61 views

Pulse Dimming to 1-10V

I have a question about the dimming of Led drivers. I have a lot of LED drivers which can use pulse dimming or 1-10V dimming. One problem I have is that I realized too late that by using pulse dimming,...
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56 views

How to limit pulse duration?

I'm trying to design automotive-oriented circuit to limit ignition pulse duration from OEM ECU to an aftermarket ECU plug-in device. The device expects +12v pulses no longer than 9ms, while the car in ...
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65 views

Determining acceptable single-pulse heating in a wire coil

I'm trying to determine the max heating allowable in an insulated copper inductor. This is a pulsed application where peak current in the 5kA range is delivered over <1ms. My task is to figure out ...
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55 views

How to convert high AC voltage generator to DC voltage to charge a capacitor

I have bought several high voltage generator which outputs AC voltage. I wish to convert this high AC voltage to DC voltage to charge a capacitor. I have tried connecting the output (10kV) to a 20kV ...
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34 views

Bi polar pulse magnetizer controlled by arduino

Hello, I am trying to make a bipolar pulse magnetiser based on the pulse magnetizer design on instructables. I attached my circuit design as image. g1 and g2 terminals of the thyristors will be ...
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54 views

How does a “pulse dialer” (e.g. IN9151) internally work?

I'm wondering how a so called "pulse dialer" like the IN9151 (https://www.digchip.com/datasheets/parts/datasheet/237/IL9151-3N-pdf.php) internally works, meaning how it is achieved to ...
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77 views

Creating a 1PPS signal froma a 10 MHz CMOS Output Signal

Is it possible to "create" a 1PPS signal using an Agilent 8165A signal generator? We currently don't have a way of testing a 1PPS signal directly, so we're looking at "making our own&...
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137 views

Simple circuit for a single 10 ms pulse when closing a contact switch

I have a simple circuit (see image below) that creates a single 10 ms pulse when closing a contact switch (SPST) but I also need that after generating a pulse the circuit will wait some time (500 ms ...
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59 views

How to eliminate electromagnetic interference when counting pulses using a micro controller?

I have written a pulse counter program for ESP32 micro-controller, the counter counts the pulses correctly when there is no EMI interference but as I turn on the small AC drill machine the counter ...
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148 views

Generate a fixed number of pulses on the STM32F4 PWM

I am trying to control a servo motor (link). It is a brushless DC motor with an interface similar to a stepper motor. The motor rotates for a defined distance based on the number of pulses it ...
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79 views

Separating odd and even pulses in a pulse train

How would one go about separating odd and even pulses in a pulse train and displaying them using LED indicators? A schematic would be of great help.
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60 views

Low-pass (band-pass) filter for op amp circuit

I have a circuit that amplifies a one-shot inductive trigger pulse of about 1.3Khz (@780 micro sec period) from about 10-200mV to about 3-4V. Between C1 and R3 there is a 0.13uH inductor coil with 11 ...
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67 views

Amplify and convert negative pulse to positive pulse

I am looking for design recommendation. Attachment is the block diagram of the system. We have a single photon detector (SPD) (https://www.idquantique.com/quantum-sensing/products/id281/) outputting -...
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43 views

Using SPST Switch as Button using Capacitor, which type?

Before I start, know that I'm still very much a beginner at electrical engineering. I'm building a switch box to be used for PC simulators using mainly (non-momentary) SPST switches and a USB encoder. ...
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93 views

How do I amplify a square wave pulse of 4 to 8 periods at 3.5 MHz from +-2V to +-60V or more?

I am working with ultrasound sensors optimized for 3.5 MHz signals, and I want to test these using my PicoScope 5000 with integrated signal generator. The PicoScope is able to generate arbitrary ...
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56 views

Build a circuit that will output an analog voltage proportional to the duration of a pulse at the input (pulse-width detection ) CMOS

I don't have a strong background in electronics, so this task is challenging for me. I need to build a circuit that will get an output like this. In my circuit, I can only use voltage sources, ...
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121 views

Designing an EMP Generator for school :^)

How would I go about calculating and designing a circuit that can produce an axial magnetic field greater than 20 Tesla for about 1.4 μs (full width at half maximum). The dimensions of the solenoid ...
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127 views

Scope says 59.9 Hz .. yet I can't measure turntable speed

I needed to measure a turntable's number of revolutions per minute, but didn't have any incandescent lamps around. So I rigged an LED to an ESP8266 SOC and programmed it with delays to output a 60hz ...
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64 views

simple way to get a single pulse using a cd4060?

Wondering what what be the easiest (least component count/passives only) of getting a single pulse from a CD4060? Looking for a delay of about 10 seconds generating a single pulse of about .25 second ...
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74 views

How to select the right HV pulse capacitor?

I'm planning to discharge a 1500VDC 150uF~250uF capacitor into a coil 20 times per second. I've found a few capacitors that might do the work, but I have some questions about their charge/discharge ...
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338 views

Generation of a shorter pulse based on trigger (similar to 555 as monostable)

I need to create a shorter pulse based on a trigger signal. Trigger signal has a duration between 1 to 10 ms and the desired output should be 0.5 ms. To do the opposite (longer output pulse than ...
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59 views

Pulse output only from switch toggle on OR switch toggle off (not both please)

I found this circuit here from a few years ago posted thanks to tcrosley. Using the 74LS122 I found that it produces a short pulse both on latching the input high AND to low. The problem is I can't ...

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