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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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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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3answers
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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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4answers
807 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 ...
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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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1answer
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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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4answers
819 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 ...
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579 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 ...
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1answer
231 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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1answer
1k views

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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1answer
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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1answer
489 views

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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3answers
711 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 ...
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3answers
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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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2answers
419 views

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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2answers
475 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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5answers
698 views

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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2answers
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 ...
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4answers
348 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 ...
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2answers
360 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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3answers
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 ...
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1answer
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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1answer
193 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 ...
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1answer
772 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....
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2answers
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 ...
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4answers
640 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 ...
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2answers
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 ...
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3answers
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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 ...
3
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3answers
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 ...
3
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4answers
11k 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 ...
3
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2answers
210 views

Limitations of Arduino Voltage Pulse? (TTL)

I am new to this forum, and I have a question regard EE and Arduino based boards. Are Arduino based boards capable of producing pulses in the range of MICROseconds (usecs)? For example, I would like ...
3
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2answers
278 views

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). ...
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3answers
491 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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3answers
212 views

Can I use 2 Flop synchronizer to migrate a pulse from one clock domain to another provided that clocks phase shifted but of same frequency?

I want to migrate this signal from CLKA to CLKB. Frequencies of both the clocks are same but they are out of phase. Can 2-Flop synchronizer be used for this? Please note that the signal can be low/...
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3answers
651 views

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 ...
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3answers
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
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2answers
530 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 ...
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3answers
826 views

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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3answers
158 views

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 ...
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1answer
429 views

Converting varying frequency and duty cycle to varying frequency fixed duty cycle

I have an LM331 which is outputting variable freq. with an input of 0-10V. The output freq. of LM331 is is varying between 50Hz to 900Hz. But the pulse width creates some trouble for the next stage. ...
3
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1answer
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 ...
3
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2answers
813 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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2answers
308 views

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 ...
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2answers
612 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 ~...
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1answer
103 views

Converting sub-microsecond opto-isolated 3nC charge pulse into a 250us low-impedance square pulse

I have a problem with short current-pulse widths through the diode of an opto-isolator -- with widths less than \$1\:\mu\$s. The charge in each pulse is approximately 3 nC. The current height of the ...
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1answer
116 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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3answers
151 views

Converting an arbitrary pulse to logic level

Background: I'm trying to measure the time interval between (4) different pulses with a baseline of ~2V and rougly 1.6V p-p . Currently I'm using the ADC on an STM32 to sample the four channels. ...
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1answer
240 views

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?
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1answer
139 views

Control latching pulse-solenoid-valve with MOSFET Array

I have a setup where I need to control a solenoid-valve via a microcontroller. The solenoid-valve needs a 50ms \$\pm\$6V with around 250mA to OPEN and another 50ms pulse of now inverted \$\mp\$6V to ...
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1answer
2k views

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 ...