# 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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### 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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### 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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### Big discrepancy between theoretical and actual power through my pulse generator

I am trying to acquire some skills about pulse generation, but that's not easy. I've tried to derive the power dissipated by the input resistor in my pulse generator, but it turns out to be much ...
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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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### What makes E-bomb or Electromagnetic pulse (EMP) destructive?

wikipedia says that Electromagnetic pulse As with any electromagnetic signal, EMP energy may be transferred in any of four forms: Electric field Magnetic field Electromagnetic radiation Electrical ...
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### Pulse withstanding capability of standard resistors

How much pulse power does a standard (i. e. not further specified) resistor withstand? Consider for example a MOSFET and a 33R resistor that is connected to its gate. If the switching voltage would ...
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### Why do RC applications use such a small PWM duty cycle?

I know that RC applications, such as a drone, use PWM signals to drive the motors. This PWM signal is mostly 50 Hz (0.02 s). The pulse itself varies from 1 ms to 2 ms. So a 1 ...
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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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### Why pulsed drain current is higher than continuous drain current in MOSFETs?

Why is pulsed drain current higher than continuous drain current in MOSFETs? In MOSFET data-sheets, pulsed drain current is much higher than (by at least 2x) continuous drain current. What is the ...
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### Measuring signal with of nanosecond pulse width with a spectrum analyser?

I'm looking to measure the signal width of electronic signals (device under test, DUT). The problem is that these signals have a quite short pulse width which would require me to use a GHz ...
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### Resistor power rating for short pulses

Just wondering how to treat a resistor power rating if the resistor is only getting current passed through it for 1us or less? Is it reasonable to exceed the power rating significantly (say 10x) for ...
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### Time of flight difference in hardware

I have an ultrasonic emitter, and two ultrasonic receivers. When the emitter emits a pulse, the receivers get the signal at different times. I am only interested in the difference between the two ...
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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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### 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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### How to create pulses which are 10ns long and 15kV/ 80A amplitude?

I'm looking for an easy way to create short high voltage pulses. These would be 10-100 ns in duration, 10-30 kV in amplitude (the load is complex but roughly similar to a 200 ohm resistive load). ...
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### Is there such a thing as a pulse relay?

Is there such a thing as a pulse relay? So that I do not have to supply constant power for it to remain open, instead just pulse it?
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### Allowable ampacity through cable

For an application we are considering pulsing a current through a conductor. The conductor have an ampacity rating of 12.5A for continuous operation. During the pulse we get currents around 25A and ...
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### Switch high voltage with triggered spark gap

I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet. I took a look at using ...
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### Automotive circuit works but with lots of heat. Is there a better way?

The Problem I have a vehicle that is ‘smart’ enough to detect when a trailer is attached. When a trailer is attached it changes ABS and vehicle stability control parameters, turns off the reversing ...
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### How to generate edge-triggered pulse

First, a bit of background: I am just a hobbyist with electronics and have very little formal education in the area. I understand most terminology, but generally require a schematic for me to be able ...
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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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### Reset pulse generator for ESP8266

I am trying to generate a reset pulse in order to wake up an ESP8266 device. The ESP8266 supports a "deep sleep" function, in which it consumes very little power. However, the only way to wake it up ...
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### Reduced output of op amp peak detection and hold circuit

I have used op amp peak detector & hold circuit for finding the peak of voltage obtained from scintillation detector and pre-amplifier. I observed that the observed peak and hold output was ...
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### Ignore Pulses Less than a Given Width in a Pulse Train

Let's say I have a 5V pulse train that varies between 0 and 75000 pulses per second. Pulse width, let's say, is 5 microseconds. How could I calculate or determine the best way to filter out all pulses ...
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### Designing a fast LED driver from scratch

I plan to build a LED driver that can pulse a high-power LED (3 W) down to the 100 s of nanoseconds pulse regime, yet also allows longer pulses (up to 100 ms) should be possible. The LED should be ...
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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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### Understanding a sub-nanosecond pulse generator

I have been reading a couple of papers (1,2) that use a Step-Recovery Diode to generate sub-nanosecond electrical pulses, for the purposes of pulsing an LED. I am simply trying to understand the ...
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### MS Surface power supply

I have a faulty Microsoft Surface power supply and I found a circuit diagram for it that I could use some help figuring it. Specifications: The LED is supposed to be on only when the Surface's Power ...
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### Conditioning current pulse signals

There is an instrument outputting pwm-like current pulse trains proportional to its rotation speed. I convert the output current pulses to voltage pulses by a shunt resistor to be read by a DAQ ...
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### Can a pulsating signal in which the direction of the current may not reverse radiate from an antenna?

Normally an antenna uses a sinusoidal wave whose positive half-period corresponds with positive direction of the current and vice versa. A pulsating signal/current is a signal in which the direction ...
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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 capacitors C6-C8 ...
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### PWM, PAM, PCM sine generation and usage confusion

I am confused about something fundamental regarding PWM, PAM and PCM. I am going to be using a speaker's driver analogy to explain my point. As far as I know motors use PWM for power input, I don't ...
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### 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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### Simple way to generate a two-level pulse?

I am looking to generate a two-level pulse as follows, where the adjustable parameters are $V_1$ and $V_2$ between 0 and ~5V, and $t$, ~5 to ~50 ms: The trigger pulse length may be anywhere ...
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### High Power pulsed LED driving circuit

Hi, can anyone describe the operation of this circuit for me, in particular what the 10 ohm resistor is for. It is meant to achieve a very high level of current through the LED. Many thanks, John
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### Astable 555 Timer creates longer pulse when just turned on

I have a question regarding the behavior of a 555 timer circuit that I have made. It is depicted below. Now, here is some interesting behavior, I wrote a program on arduino that measures the lengths ...
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### Pulse Generator - I (Art of Electronics)

In The Art of Electronics book, I don't understand the following phrase: "…because current is ﬂowing down through 𝑅3, trying to pull it up." Figure 2.11. Generating a short pulse from a ...
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### What should be the sampling frequency for a square pulse train in a DAQ system?

Since a square pulse has very high harmonics how to obtain a good resolution of pulses? For example if we have pulse train around 500 Hz could we treat it as a typical analog signal and sample it with ...
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### Device/circuit for high current, short pulse discharge?

I'm tasked with replacing a relay with a semiconductor switch in a high voltage, high current, short pulse duration application (all relative, I concede). Basically I'm charging a capacitor up to ~...
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### Component for switching 1000V - 100Amps condenser discharge pulse

I am miniaturizing a circuit used to generate a pulse using condensers into an inductive load. I am a little lost on what would be the best type of component to choose to start the discharge (ie. a ...
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### Limit Number Of Pulses From 555 Or Similar

I need as small a circuit as possible that can produce 2 pulses (say maybe 200 milliseconds long and apart) when I press a button. My thought was to use a 555 timer and set it up for my desired pulse ...
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### 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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### I wanted to convert 0-1v, 2ns pulse to 0-7v, 2ns pulse

I wanted to generate a 2ns pulse width signal in particular 2ns ON time and 6ns OFF time signal. I can generate a 0-1v signal having 2ns pulse width using FPGA(by any means we cannot have more than 3....
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### Impedance matching for high speed pulse generators

I came across the following article on impedance matching for pulses which have very sharp rising and falling edges: https://www.avtechpulse.com/appnote/techbrief12/ They claim that the output ...
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### Can I use a supercapacitor (like Maxwell boostCAP 3000F) on a coilgun?

Can someone tell me if I can use a supercapacitor (like Maxwell boostCAP 3000F) on a coilgun? I want to obtain a very intense magnetic field for a project, and I'm not sure what capacitors should I ...
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### 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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### How does this pulse amplifier work?

I'm studying Bob Parker's ESR Meter Mk2 and got caught in a part of the circuit that he calls pulse amplifier, which schematic I copy below: Figure 1: Bob Parker's ESR Pulse Amplifier As far as I ...
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### 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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### Cheap and simple solution for low frequency (period about tens of seconds) pulse generator

I need to generate a pulse each let's say 30 seconds. I don't need this period to be any precise (20...40 seconds fluctuation will be OK). The pulse duration should be about 1 ms. I tried to ...
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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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