# 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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### 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. ...
40 views

### 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 ...
797 views

### 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) ...
111 views

### High Frequency Pulse Rate Generator - Science Fair

( For our High School Science Fair) I am trying to find a pulse rate generator capable of producing 2.5Hz - 20,000 Hz utilize with over 10,000 LEDs all at once with several milliseconds in between ...
2k views

### How to use MOSFET in avalanche mode?

I'm thinking of a very simple circuit to generate high voltage pulses, like this: simulate this circuit – Schematic created using CircuitLab The MOSFET in this case will turn on until the ...
72 views

### Why do my outputs look exactly the same for the Allegro 3901?

I am trying to capture results shown in Figure 8 of Allegro 3901 data sheet . My circuit looks like this: The channels above coresspond to the oscilloscope screen captures below: In the image ...
23 views

### Choosing RJ45 connector for ENC28J60 (QFN)

I am designing a PoE powered board that uses a ENC28J60 chip to connect to ethernet and power a Raspberry Pi 0. Per the ENC's data sheet, two pulse transformers are required for the ENC. Currently, I ...
91 views

### Can I use diodes to protect power supply outputs?

(Note, this is my first question on this site, please point out if there is something that I am doing wrong here.) I have a thyratron that requires two separate power lines to attach to it. The two ...
52 views

### How sharp will be a pulse sharpened with microwave transistors in a schmidt trigger configuration?

My hope is to make a 7-10V pulse generator, with pulse width in between the 100ps - 1ns. I think simply to use microwave transistors 2SC3356 in a Schmidt trigger configuration to sharpen a pulse of ...
50 views

### 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 ...
56 views

### 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 ...
58 views

### 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 ...
59 views

### 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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### Why is the top of the transmission line reflected pulse reduced?

I use this circuit to simulate the transmission line reflection, why the distortion occurs when the pulse signal is reflected back to the source. Only when the output impedance of the MOSFET pulse ...
393 views

### Pulsed DC, kA range inductive transient protection method

I would like to design a transient protection solution for HVDC_pulse_unit. HVDC voltage = 3500V , current > 40kA. Events: D1 flyback diode survives(50kA surge forward current). MOVs section did ...
46 views

### Generate ultrashort rise times with photoconductive switch or photodiode

I am trying to produce voltage pulses with very short rise time (<15 ps), medium width (20 ns) and amplitudes up to 15 V. As a promising candidate I selected photoconductive switches and ultrafast ...
88 views

### Resonant, autotuned nanopulser

My need is to build (or purchase, if existent) a nanopulser, but not an ordinary one: it has to have some specific characteristics. The premise is: I have a device which acts as a variable capacitor ...
136 views

### How to do fast RF on/off keying

I'd like to make a circuit that essentially produces very brief bursts of an RF signal, for example RF at 10MHz to 200-300MHz bursts of tens to hundreds of nanoseconds. For example this could be just ...
434 views

### Pulse sensor: Choosing the right resistor for the phototransistor

I want to use specifically the SFH 309 NPN phototransistor in order to create a pulse sensor that works as seen below: The IR diode emits IR light to the fingertip from the one side and on the other ...
85 views

### Clock signal sharpness

I'm currently tuning the termination resistors in the clock circuit. The resistor here is 330 ohms, I got a rippled clock signal like this: I increased both resistors value to 430 ohms and I got: ...
46 views

### Storing pulses, then releasing them on trigger

I have a BeagleBoneBlack microcontroller that can generate pulses and clock for SPI. These pulses have rise times of a few tens of nanoseconds, which is nice. Unforunately, the BeagleBone is 'slow':...
855 views

### How to make pulse wave from sine wave - audio frequency

I'm looking for a quick-and-dirty way of converting something close to a sine wave to a narrow pulse wave. Please see the image: a low bass note played through a broken transformer. I'm trying to re-...
59 views

### Circuit that takes input signal and controls led

I am trying to design a circuit that compares a recorded signal to a stock signal. If they are not similar it then inputs a signal into a circuit which will change the pulse of the led to stimulate a ...
34 views

### Neon Power Supply Voltage AC Measurement

So I was provided with a circuit which consists of a variable transformer connected to the main (essentially allows the input of the power supply to be controlled) and a Neon Power Supply (Has An ...
33 views

### 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 ...
44 views

### 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 ...
75 views

### 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 ...
30 views

### 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 ...
57 views

### 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....
20 views

### 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 ...
43 views

### 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 ...
65 views

### 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 ...
119 views

### Pulse skip modulation vs Phase cutting for AC inductive loads?

What is preferred and safe mode for controlling power to an Inductive AC load when driven by a Triac? I am using a microcontroller with zero crossing optocoupler to drive the control signal and the ...
52 views

### Capacitor life hours

Working on an existing product which has had field failures. Design is a short (60ms) pulse is sent via microcontroller to activate / deactivate a latching switch. I have determined failure is due to ...
73 views

### How to make this circuit pass all conditions

I have this circuit (as part of a larger design): simulate this circuit – Schematic created using CircuitLab The resistors are with a tolerance of 1%. On the input, V1, the circuit gets a ...
47 views

### Rising edge to Pulse Voltage

Im basically entirely new to Electrical Engineering, however I really want to challenge myself to become a better one, so I decided to try to mod a nerf gun to be a coil gun, more or less. Now, I know ...
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### Should I use a separate power supply or separate grounds in this scenario?

Regarding one of my previous question I decided to implement the follwing wiring scheme for a scenario. simulate this circuit – Schematic created using CircuitLab The scenario is to trigger ...
20 views

### Choosing the right parameters for a Pulse wave simulation in a CAD schematic

I'm trying to choose the right parameters in the simulation in order for the output to show a square wave of gain C1/C2 = 2V Anyone know what I'm doing wrong? Thanks.
66 views

### Can a semiconductor device discharge power capacitors

Trying to figure out how to discharge a capacitor yielding 75 Joule - 177v @ 4700uf. I am uncertain which or even if a semiconductor device is up to the task. Can semis do it? If yes then which can do ...
122 views

### 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 ...
70 views

### minimalistic digital 2-speed oscillator with 555

I'm trying to figure out how I can turn a schematic of a one-speed simple 555 astable multivibrator that's available everywhere on the internet to a digitally controlled astable multivibrator in which ...
53 views

### Determine if servo pulse length is in a given range

Quick refresher on servo control: High pulses are 20ms apart and last between 1ms and 2ms. I know this could be done with a microprocessor very easily, but I want to do it without one because the ...
356 views

### Calculate an inductive coil parameters for EMP generator

For research purposes, I want to calculate an inductive coil parameters suitable to work with high voltage and low amperage impulses, produced by power source (handheld high voltage generator) that ...
192 views

### 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 ...
66 views

### Pulse generation options for 1.695 MHz

I have a design in which a CPLD (complex programmable logic device) is used to generate two pulse signals at 1.695 MHz. Of course the CPLD does some other tasks but I only need the pulse generation ...
126 views

### 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 ...
27 views

### Bus Exchange From first Rising Edge

I would like to create a circuit that takes in two pulse trains that exchanges output lines depending on which pulse comes first. Currently I am using an ON 7WB383 and switching the signal manually by ...
161 views

### 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 ...