# 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 ...
3k views

### 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 ...
167 views

### 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 ...
2k views

### 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 ...
845 views

### 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 ...
4k views

### 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 ...
2k views

### 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 ...
834 views

### 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 ...
590 views

### 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 ...
268 views

### 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 ...
6k views

### 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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### 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 ...
751 views

### 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 ...
18k views

### 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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### 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 ...
490 views

### 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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### 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). ...
4k views

### 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 ...
362 views

### 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 ...
2k views

### 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
1k views

### 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 ...
194 views

### 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 ...
773 views

### 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....
1k views

### 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 ...
650 views

### 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 ...
3k views

### 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 ...
2k views

### 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 ...
489 views

### 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 ...
12k views

### 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 ...
368 views

### Buffer for 5V, 500ps to 10 ns pulses

I am trying to make a buffer for short, 5V pulses. The pulses are negative (form 5 to 0 V) and last for 500 ps to 10 ns (Half maximum, full width). The load is capacitive, around 50pF, and as close as ...
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### Trouble with Schimtt trigger settings for varying sinusoidal inputs

To make my problem easier to describe, I drew the above figures (abbreviated as Fig.). The sinusoidal input comes from a rotating device, from a small alternator(a permanent magnet AC generator). ...
550 views

### 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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### Convert 2s pulse into short pulse to wake up ESP8266

I have an ESP8266 that does something, then goes to sleep. I also have an AM312 PIR sensor which wakes up the ESP when activated. The PIR generates a 2 second long pulse when activated. The ESP ...
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### How to lengthen a short pulse?

i'm building a shot counter circuit for my airsoft gun controlled by an ATtiny26L MCU, where the shots are detected by an infrared diode + phototransistor couple. The PT outputs positive signal when ...
545 views

### From pulse height to number of electrons

Assume that there is a pulse on a scope with $100\;mV$ height, as shown in picture This pulse is coming from a photomultiplier tube. How to determine the number of electrons from which this pulse ...
444 views

### 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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### Simplest circuit to set minimum voltage

First, let me say thanks for taking the time to read/help. I'm fairly new to electronics design, although I have a decent working knowledge (and am not afraid to do the legwork to figure out how ...
1k views

### Designing a fast LED-driver from scratch

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

### 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. Why does this current try to pull the cap up? ...
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### How to generate 1 MHz pulses of +10/-30V?

I want to generate 1 megahertz square wave pulses between +10V and -30V, supplying 20mA with a variable duty cycle. What is the recommended way to do this given the inconvenient voltages and ...
684 views

### 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 ~...
119 views

### Calculating pulse width

The following circuit is taken from The Art of Electronics book. Assuming the base-emitter voltage drop of 0.6V for both the transistors, the C1 charges to approximately 4.4V (left-to-right) when ...
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### frequency and type of pulse for time domain reflectometer (TDR) [closed]

I would like to apply the time domain reflectometry method in an fpga. However, I could not find information about the frequency and type of pulse used by reflectometer. Can anyone give me a guide?
12k views

### How to use a STM32F030F4's timer 3 in input capture mode to measure pulse width?

Update I checked the block diagram of the timer 3 again It looks like there's no connection between channel 4 and the trigger input ...
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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 ...
734 views

### How to generate a short (µs) high power pulse

I'm faced with the following problem. I would like to send a current pulse of about one amp through tissue with a resistance of about 3000 ohm (so I need 3000 V obviously). The pulse should be as ...
1k views

### arduino pulse to transistor power maximum

Hello I want to get a confirmation that what I am doing is not going to fry my Arduino Mega. The sketch I am using to send a pulse out on pin 8 to a 2n3055 that is switching 12 volts is this: ...