# 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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### 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 ...
85 views

### best high pass filter topology to extract low V kHz range pulse from noisy 60Hz line voltage before daq

I need to extract a 1 kHz-10kHz range voltage pulse created by a current pulse I inject on an harmonic rich 60 Hz network and that propagates on it. The line voltage is 120V AC. harmonics 2 and 3 are ...
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### How is a magnetic field generated by an inductor when supplied with a pulsed current (pulse induction)?

My question relates to pulsed induction (PI) metal detection in particular. It is my understanding that in a DC circuit an inductor acts as a conductor with little to no energy stored in a magnetic ...
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### Toggle Flip-Flop for Voltage Higher than Logic Levels

I need a T flip-flop for 24V. The purpose is to take a 24V 50% duty cycle 0.5Hz pulse wave and halve its frequency to 0.25Hz, so that the output wave toggles between 0 and 24V at the input's rising ...
1 vote
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### 555 timer unstable pulses

I'm using a 555 timer to drive the clock of my circuit. However, even with capacitors from VCC to GND, and from Pin 5 to ground, I'm still getting this "bump" when the timer transitions from ...
397 views

### Why does the PMOS burn out in a buck boost converter when I increase the power supply voltage?

My MOSFET warms up and even burns out when I change the power supply to 8V. I get an input current of 1A , and the MOSFET burns. This is the datasheet. I dont know why. I have an IRF9540n MOSFET. ...
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### Fast switch rise time techniques

This question is continuation of this question: High Frequency Square Wave Generator I am trying to drive a 400V supply and 50ohm load with an RF MOSFET which has a rise time of 3-4 ns and fall time ...
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### How to make a constant current-pulse current charger for lithium ion?

I've been doing some research about battery charging system with the CC-PC-CV (constant current-pulse current-constant voltage) method. However I have some questions and need some guidelines for ...
529 views

### How do I build an RC-base negative edge detector, that makes a low pulse on a falling edge?

I keep coming back here searching for an RC-based negative edge detector for TTL levels, that generates a negative pulse on a falling edge. The only place I find this solution is a certain spot in a ...
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### Measuring average DC of pulsed analog signal

I'm trying to measure average DC level of pulsed analog signal. The pulses have minimum pulse width of 10 us and amplitude of max 5 V. Pulses are somewhat gaussian shape and have very random height ...
142 views

### Circuit to generate a very short pulse from long pulses is not working

Here is a simple circuit I found recommended on here for generating a very short pulse from longer pulses (in this example from a switch) However it isn't behaving as expected when resetting a CD4017....
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### How Does Osram Measure Pulse Handling Capacity?

Looking at datasheets like the SFH4641 from Osram, I noticed the pulse handling capacity diagram, and although I hadn't really thought about it before, I don't know how they measure that. Niavely, ...
1 vote
163 views

### Pulse Dimming to 1-10V

I have a question about the dimming of Led drivers. I have a lot of LED drivers which can use pulse dimming or 1-10V dimming. One problem I have is that I realized too late that by using pulse dimming,...
1 vote
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### How to limit pulse duration?

I'm trying to design automotive-oriented circuit to limit ignition pulse duration from OEM ECU to an aftermarket ECU plug-in device. The device expects +12v pulses no longer than 9ms, while the car in ...
229 views

### Determining acceptable single-pulse heating in a wire coil

I'm trying to determine the max heating allowable in an insulated copper inductor. This is a pulsed application where peak current in the 5kA range is delivered over <1ms. My task is to figure out ...
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### How to convert high AC voltage generator to DC voltage to charge a capacitor

I have bought several high voltage generator which outputs AC voltage. I wish to convert this high AC voltage to DC voltage to charge a capacitor. I have tried connecting the output (10kV) to a 20kV ...
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### How does a "pulse dialer" (e.g. IN9151) internally work?

I'm wondering how a so called "pulse dialer" like the IN9151 (https://www.digchip.com/datasheets/parts/datasheet/237/IL9151-3N-pdf.php) internally works, meaning how it is achieved to ...
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607 views

### Creating a 1PPS signal froma a 10 MHz CMOS Output Signal

Is it possible to "create" a 1PPS signal using an Agilent 8165A signal generator? We currently don't have a way of testing a 1PPS signal directly, so we're looking at "making our own&...
1 vote
838 views

### Simple circuit for a single 10 ms pulse when closing a contact switch

I have a simple circuit (see image below) that creates a single 10 ms pulse when closing a contact switch (SPST) but I also need that after generating a pulse the circuit will wait some time (500 ms ...
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### How to eliminate electromagnetic interference when counting pulses using a micro controller?

I have written a pulse counter program for ESP32 micro-controller, the counter counts the pulses correctly when there is no EMI interference but as I turn on the small AC drill machine the counter ...
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### Generate a fixed number of pulses on the STM32F4 PWM

I am trying to control a servo motor (link). It is a brushless DC motor with an interface similar to a stepper motor. The motor rotates for a defined distance based on the number of pulses it ...
156 views

### Separating odd and even pulses in a pulse train

How would one go about separating odd and even pulses in a pulse train and displaying them using LED indicators? A schematic would be of great help.
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### Low-pass (band-pass) filter for op amp circuit

I have a circuit that amplifies a one-shot inductive trigger pulse of about 1.3Khz (@780 micro sec period) from about 10-200mV to about 3-4V. Between C1 and R3 there is a 0.13uH inductor coil with 11 ...
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### Amplify and convert negative pulse to positive pulse

I am looking for design recommendation. Attachment is the block diagram of the system. We have a single photon detector (SPD) (https://www.idquantique.com/quantum-sensing/products/id281/) outputting -...
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### Using SPST Switch as Button using Capacitor, which type?

Before I start, know that I'm still very much a beginner at electrical engineering. I'm building a switch box to be used for PC simulators using mainly (non-momentary) SPST switches and a USB encoder. ...
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### How do I amplify a square wave pulse of 4 to 8 periods at 3.5 MHz from +-2V to +-60V or more?

I am working with ultrasound sensors optimized for 3.5 MHz signals, and I want to test these using my PicoScope 5000 with integrated signal generator. The PicoScope is able to generate arbitrary ...
176 views

### CMOS circuit that will output an analog voltage proportional to the duration of a pulse at the input (pulse-width detection)

I don't have a strong background in electronics, so this task is challenging for me. I need to build a circuit that will get an output like this. In my circuit, I can only use voltage sources, ...
1 vote
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### Designing an EMP Generator for school :^)

How would I go about calculating and designing a circuit that can produce an axial magnetic field greater than 20 Tesla for about 1.4 μs (full width at half maximum). The dimensions of the solenoid ...
1 vote
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### Scope says 59.9 Hz .. yet I can't measure turntable speed

I needed to measure a turntable's number of revolutions per minute, but didn't have any incandescent lamps around. So I rigged an LED to an ESP8266 SOC and programmed it with delays to output a 60hz ...
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### How to select the right HV pulse capacitor?

I'm planning to discharge a 1500VDC 150uF~250uF capacitor into a coil 20 times per second. I've found a few capacitors that might do the work, but I have some questions about their charge/discharge ...
1k views

### 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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### Pulse output only from switch toggle on OR switch toggle off (not both)

I found this circuit here from a few years ago, posted thanks to tcrosley: Using the 74LS122 I found that it produces a short pulse both on latching the input high AND to low. The problem is I can't ...
1 vote
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### Voltage across capacitor - pulse 2a

simulate this circuit – Schematic created using CircuitLab I have this case where my V1 supply voltage is constant at 14V. The C1 capacitor now charges up to 14V and assume my capacitor C1 is ...
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### How to find the exact value of K for SN54LS123

I have a circuit containing SN54LS123 (Datasheet) IC. I want to know the output pulse width but unable to figure out the value of K. The formula is PW = K * R * C. The values of K is given in the ...
852 views

### Low-complexity generation of single pulse using RC circuit from a fixed DC supply without the use of a controller

I was looking for a similar solution to this question: I want to generate a pulse (high) of 2 seconds when that DC supply is turned ON. Is there a solution where we can implement this without using ...
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### What electrical attributes determine if signals from a signal generator can penetrate objects?

Lately, I've been reading about all kinds of signal generators (pulse generator, arbitrary function generators, arbitrary waveform generator, waveform generator, frequency sweep generator, PEMF signal ...
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### How to calculate PAM signal power spectrum

How to calculate power spectrum of given signal
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### How do you get a short pulse out of a sustained high?

I am trying to get a half-second pulse out of a long/permanent high pulse. I am still new to electronics and think a capacitor would be involved? I want to use CMOS logic level. Accuracy is not too ...
251 views

### Drop-out pulse test

I have a switching MOSFET circuit. Input to the switching MOSFET circuit is 11V at the drain. The gate is connected to a function generator. 5V peak-peak, frequency = 1kHz, 1ms (time period) & ...
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101 views

### Selecting a Capacitor for Pulsed Power

Background: I'm planning on making a hard tube modulated pulsed power supply. This will use a thyratron set to trigger at a frequency of 6 Hz, a 60 nF capacitor bank, and a 0.625 mH inductor. The ...
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### How to pull a normally floating pin to ground for 500ms when circuit powered on and circuit powered off [duplicate]

I need some help designing a circuit to pull a floating pin to ground for approx 500ms when the circuit is first powered on, then pulling it to ground again for another 500ms when powered is lost. The ...
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### How to relate the sampling frequency to the measurement error for this kind of pulse period measurements?

I sample a zero to 400Hz varying pulse train at 4kHz and post-process this pulse train data by MATLAB to obtain each single pulse's period. So for instance below represents a 0 to 6V pulse. The green ...
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### Rated power vs. temperature for resistors

As you know, there is a Rated power vs temperature curve for resistors in datasheets like the image below. For DC inputs, I think everything is clear about power. My question is that for pulse inputs,...
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### 8000 Amps across a 1 A diode for 0.2 uS

Assuming that the diode is rated for 20 kV and the pulse is only 250 V, will a 250 V 8 kA pulse that lasts 0.2 uS break a 20 kV 1 A diode? This also assumes that the diode recieves 10 of these pulses ...
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### Using a cap to predict the presence of a pulse via voltmeter

I have a pulsed power supply that provides 250v pulses with a pulse width of 2 uS and a frequency of 10 Hz. However, I'm unaware of the polarity of these pulses. In order to detect the polarity of ...
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### Python to trigger USB square wave pulse for camera

I'm sorry if this was posted somewhere, but I'm trying to trigger a FLIR camera for acquisition using a USB port. I already purchased a USB split cable, and have queried the ports, so I know exactly ...
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### Measuring Forward Impedance of a pulsed drive circuit

Background: I recently built a thyristor driving circuit to supply a set number of trigger pulses to my thytratron (tetrode configuration). The spec sheet for the thyratron requires that my driving ...
140 views

### Pulsating a vibration module using purely an analogue circuit

I have a simple analogue circuit I'm trying to create. Essentially it's a 1.2V power source that pulsates a vibrator motor - without a 555 timer. When the circuit is closed, uninterrupted current is ...
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