# 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.

341 questions
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### How to make a circuit to pulse an output when a momentary switch is released

I need to make a circuit that has a momentary switch and a light (30mW). When the switch is pressed, nothing should happen, but when the switch is released, I want it to pulse the light for a short ...
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### Removing Overshoots in constant-current bi-phasic pulse generator

I am designing a constant-current, bi-phasic pulse generator in a simulation study. I have attached the circuit and output current pulse. As it this picture shows, I have a +600 to -600 micro Ampere ...
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### Raspberry Pi hat design

I am designing a Raspberry Pi hat that needs to be able to accept inputs from 3 different water meters. Two of the inputs are 4-20mA signals, the third input being a pulse signal. At the top I have ...
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### One pulse to ON/OFF bistable latching relay

I've been trying to design a latching relay driver circuit, with using a push-button switch. Basically when the circuit is powered on, first press in push-button switch make the relay SET, then the ...
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### Oscilloscope measurement of square wave

I am using my Arduino uno to generate a 500Hz Square wave between 0 and 5 volts. I am measuring the signal from the Arduino using an oscilloscope and instead of measuring 5 volts peak to peak, it ...
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### PI Metal Detector Amplification Circuit

I've been research metal detector designs for a few days now and I can't quite wrap my head around the amplification they are using for the first stage right out of the coil. Below is an example ...
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### Pulse generator in Simulink Matlab

I want to generate a pulse in Matlab Simulink fixed point solver. The step size in the Simulink fixed solver is 1e-06, but I need a pulse width of 2e-08. The figure shows the clear requirement of ...
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### IGBT-based capacitor charge transfer and thyristor-based capacitor discharge

simulate this circuit – Schematic created using CircuitLab I am designing a circuit to provide a couple of strong and fast current pulses (~1000 A, more current is better, ~100 us, half-sine) ...
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### Variable pulse train generation

I need to generate a pulse train with 12 bit resolution, controlled by an MCU. The duty cycle can be in the range of 30 - 40%, while the frequency (0.5 - 32 kHz) is what needs controlling with 12-bit ...
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### Why does this rising edge detector using a capacitor and a resistor work?

So in this video from Ben Eater he makes a rising edge detector using a capacitor and a resistor like the one below. simulate this circuit – Schematic created using CircuitLab In the video Ben ...
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### Pulse train profile generator for stepper drive step/dir input

All, I am trying to create a circuit to control a stepper drive step/dir input. I'd like to generate pulses starting at 1kHz and ramp up to a 10kHz peak, then decelerate to 1kHz until motion is ...
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### How do I detect a pattern of 4 pulses from 4 different signals?

How do I detect a pattern of 4 pulses from 4 different signals? I want to be able to detect every time I see for example the pattern circled in blue. When I detect this pattern, I want to output a ...
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### Avalanche relaxation oscillator biasing resistor

I've tried the circuit in this article. It works very well and I've obtained 2ns clear pulses at 150 V (the main issue was to find the right avalanche voltage, which turned out to be 150-160V for my ...
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### Sizing cables in pulsed power applications

I am looking for rules for sizing cables for short pulses. For example, if I were to run 2000A DC current for 0.5 seconds in a cable, what size would I need? Sizing as if it were continuous current ...
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### How does the output jump up to 7.5 volts when the switch is closed and opened again?

Sorry if the question might sound dumb. In this circuit, when the switch is closed the output voltage drops to zero and then rapidly charges back up to 5 volts. My question being, when the switch is ...
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### oscilloscope turning off during pulsed power tests

I'm recording voltage and current waveforms using an oscilloscope. The application is pulsed power. A problem I am having is the oscilloscope is losing power / turning off when I trigger the system....
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### High voltage pulse discharge ring dampening (how to save a pulse capacitor)

So I have a high voltage pulse circuit. I have planned it to be around 90kv with the capacitor being 1.3uF. It is to be discharged through a spark gap. Before I test it, I of course want to save the ...
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### Pulse width for mark pulse

What is the pulse width for the mark pulse in an equal mark to space ratio pulse train operating at a repetition frequency of 5 MHz? The answer is suppose to be 100 ns .But I didn't understand how to ...
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### Question relative to pads for capacitors - high frequency

In the article Compact sub nano second pulse generator using avalanche transistors, I read P. 874 Further, we used pads on a doublesided 0.062” FR-4 epoxy glass laminate pc-board for ...
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### Battery choice: Effect of “pulse current” and “continuous current (maximum)” rating differences

I am trying to understand the consequences (if any) of substituting a CR2450 battery for the specified CR2340 lithium battery in a small device. The device is constantly "on" and transmitting a ...
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### 12 V pulses with 100 MHz repetition rate

I have to control an high impedance load (> 25 MΩ) with 12 V pulses with maximum 5 ns of width and a repetition rate of 100 MHz. I can generate the pulses with the required shape using an FPGA ...
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### Capturing pulse periods by sampling accurately

Regarding the following statement: In order to preserve the integrity of the pulse through a system, it is mandatory that the group delay of the system be constant up to the maximum frequency ...
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### Converting Pulse Sequence Inputs Into Separate Outputs

I'm trying to find the simplest way of accomplishing the following task: Convert 3 different pulse input sequences into one of 3 different output lines The image below explains the problem ...
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### Square Wave (w / Pulse Missing) Generation

this is probably a simple one for anyone with some electronics design experience (which I do not have). Can anyone tell me how to build a simple circuit which generates a square wave but has every nth ...
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I am planning to measure the voltage of an rgb LED pulsed with an ADC. The pulse is around 20ms long. The pulse is necessary so the self-heating is within reason so it won´t affect the any ...
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### Seeking recommendation for capacitor to handle high pulse current

I'm seeking recommendations for an inexpensive capacitor that will handle fairly-large pulse currents. Maximum voltage is 15 Vdc applied to the capacitor and I'd like to see current pulses in the ...
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### Schottky datasheet - divergence in Vf / If diagram vs “pulse test” table values

while looking at datasheets for clamping schottky diodes, I noticed that the values that manufacturers state in their tables ("Pulse test: tp < 300 µs; delta < 0.02.") are different from the ...
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### High voltage nanosecond pulse generator

I am trying to build a PCB based pulse generator that can produce a pulse with a width of about 100 ns and 500V-1000V peak amplitude to a 50 ohm resistive load. I will use the circuit for burst pulse ...
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### Ambient Light cancellation on Pulse Oximeter

I'm trying to build a pulse oximeter using TSL2305 LTF sensor and 2 LEDs(Red and IR). The desired graph expected from the light are plotted correct but I want to know whether there should be any ...
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### Clock synchronised to pulse

I'm thinking about 1Mhz clock signal synchronised to external random pulses (eg. rising edge). Before pulse event clock can be running or stopped. After every pulse, it should run in same fixed phase ...
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### Measure pulse width generated in one pulse mode using HAL

I need to generate pulse in one pulse mode and measure width of this pulse using HAL. I'm using STM32F446RE board. I managed to configure timer to generate pulse but I have no idea how to implement ...
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### 1PPS vs high resolution timer in CPU

We need to use 1PPS (pulse-per second) in our standalone system which is based on arm processor, and has cameras input. The 1PPS is implemented with GPIO which is injecting an interrupt (low to high)...
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### Deciding which assembly is more common positive edge detector

I know of two circuits which can act as edge detector: A clock connected as a voltage source across a RC component where resistance is composed of a diode and a resistor and this in series with ...
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### Resolution of FRR Function

I am working with a oscilloscope GWINSTEK gds-2074a. As per the time resolution is concerned, turning the dial all the way down, it shows that it can go down to 1 ns. There is a Delay function in the ...
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### Rising edge pulse detector from logic gates

The circuits I describe are entirely made of 7400 series logic gates (7402, 7404 and 7408 ic). I'm trying to build a rising (positive) edge pulse detector using logic gates. The following circuit ...
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### How can I delay a pulse by 0.5 s? [duplicate]

I asked something similar here. Now, when I make my circuit, I've seen that I don't need something that gives a pulse after being powered-up, but I just need a delayed pulse. I know nothing about ...
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### Question regarding operation of a pulse generator circuit with 3 transistors (exercise 2.3 art of electronics)

The exercise 2.3 in 3rd ed. of Art of Electronics asks: what is the output voltage during the pulse? I've replicated the circuit diagram from the book below (in circuitlab.com). I'd be grateful if ...
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### Estimate minimum detectable light pulse in a photodiode (5 ms, 44 kHz modulated)?

I'll use an IR LED modulated at 44 kHz to illuminate particles in air or water, and will use a silicon photodiode to detect weak pulses of scattered light as they pass through the LED's collimated ...
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### How to make current pulses

I want to make current pulses, the intensity of the pulses must go up slowly during a period of time until it reaches a maximum value... I have thought of using a microcontroller to make voltage ...
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### Correct way to compute the power of a pulsed signal

I'm developing an application with my SDR Board and I've managed to produce a calibration table to verify the output power of the transmitter for every TX configuration of antenna gain and IQ digital ...
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### Design of pulse transformer

I want to design a pulse transformer to drive a MOSFET. Parameters are as follows: Voltage = 15V Current = 2A Switching Frequency : 400kHz. Ratio 1:1. Duty Cycle = 50% I know the following ...
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### Amplifying pulse signals causing pulse lengthening problems

I am currently trying to design a circuit that would sense a voltage change at its input, convert that change into rapid "on"/"off" change at output and amplify same switching voltage to high current (...
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### Pulse reset line with long press of a button

This question is a variation of How to trigger reset at long press of button. Namely, I need to pull down a reset line with a short pulse of X length, if a button is pressed for Y>=X or more seconds. ...
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### Generate one-input pulse in Verilog

I'm attempting to port discrete schematics into a FPGA. In the schematics some AND gates function as short pulse generators, when input goes low output is enabled, until input propagates down an ...
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### Can anybody identify this component (SPRAGUE 663044-4) on this vintage electronic?

I am repairing a vintage Seeburg/Gulbransen 'Select-a-Rhythm' drum machine from 1967, the kind you would sit on top of your organ and play along with. I am trying to distinguish what this component ...
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### Why is the pulse reflection becoming like this in pulse?

I use mosfet to generate a pulse, input the pulse into the transmission line, and after the reflection, test the waveform as shown. Why did the third reflected waveform become like this? I calculated ...
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### Long (500ms) Pulse Extender

I have an SPST momentary tactile switch and want the pulse, whatever length, to be extended to 500ms (unless of course the button is pressed for longer than 500ms but we can ignore that if we hold the ...
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### Why does the first pulse have a different duration than the other pulses?

Why does the triggered astable in the next figure have the duration of the logical component "0" of the first pulse lasting 2 times the logical component "0" duration of the next pulses (see the ...