# 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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### 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 ...
3k views

### How to turn a pulsed signal into a continuous one?

I have a pulse signal at 1 hz which goes high +5V and low 0V. How do i turn it into a continuous one? +5V. i have searched in different places and what i found says that there are different methods ...
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 ...
679 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 ~...
290 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). ...
497 views

### Holding voltage high, for monostable 555 timer pulse

I want to know if there is a simple (and cheap) way to make a momentary button (for which we cannot control the time it holds when pressed!) press to virtually hold for about 1-2 seconds. More ...
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

### 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 ...
279 views

### Shaping negative pulses to positive ones

I have built a scintillation detector. The detector outputs 0,1 ms 50-200 mV negative pulses from a photomultiplier (DC). The pulse shape is shown in the picture below. To detect the pulses I need ...
610 views

### High power pulse generator

I'm designing a relatively high power pulse generator. Basically I have a microcontroller generating a clean square wave (0-3.3 V or 0-5 V) which then goes into my amplification circuitry. I want to ...
417 views

### Convert a toggle switch into a momentary response

I'm working on a project and I need to use a toggle switch to control a device that expects a momentary signal. What I want is send a momentary pulse when turning it on and off. Ie: swith off to on: ...
16k views

### Make a Latching Relay using SPDT Relays

I want to make circuit which can working like a Latching Relay which Hold Current using SPDT Relays. So i can use this circuit to Pules ON/OFF switch. Using limit switch when pressed a pulse goes ...
54 views

### Can't understand concept, range of the pulse (waveform)

I am working on the lab which is allowed to ask other people for hints. In the image, program called "Audacity" is used to capture that waveform. Question 1 In the image it says, "The peak-to-...
3k views

### How do I produce a 1Hz clock output using a 555 timer IC? Are there better ways other than a 555 timer IC?

I've been messing up with timer ICs, looked up on how they work and now I want to design a simple digital clock using a 1Hz pulse generator. Is a 555 timer IC sufficient enough to make accurate 1Hz ...
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 ...
853 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? ...
2k views

### How do I build a one shot non-retriggerable pulse generation circuit with 2 triggers?

I'm kind of a noob when it comes to electronics (I'm mainly a computer programmer), so please bear with me. I want to construct a one shot non-retriggerable pulse generation circuit that has two ...
726 views

### Counting pulse in firmware without interrupt

How can I count the number of pulses using a microcontroller (any), provided the following conditions: Can not use any interrupt (no interrupt on pin change allowed) Can not use any of uC's hardware ...
8k views

### How to remove DC offset of the input signal without using an opAmp?

Below is a pulse train with a DC offset: This will go to the circuit below as input. The thing is this works well in simulation but in real I need to remove the offset of the input signal. My ...
177 views

### Experiments to convert analog 10ns pulse to digital 10ns pulse

My objective : converting laser pulses from photo diode ranging from 10nA - 100mA (60dB dynamic range of incident power) to digital format, for measuring pulse width exactly pulse width 10ns and ...
263 views

### Is there a good physical model for what happens when a light bulb suddenly goes out?

Sometimes a light bulb just stops working and goes dark for seemingly no reason. Can Dirac δ impulse to a light bulb serve as a mathematical model for what happens so we can assume that the electric ...
158 views

### Scaling a car's injector pulses to count and time them?

What would be an efficient way to reshape a car's injector pulses to digital 0-3.3V pulses, so a microcontroller can count and time them? The waveform can be seen on this page under "Example waveform"....
1k views

### Feeding 12V Pulse into Microcontroller 5V - Use a Transistor?

I have a 12V Tachometer Pulse Signal From an ignition unit(From the data sheet)...I would like to feed this pulse into a micro-controller to output the speed to a LCD display. I don't have a scope to ...
311 views

### Need help with current pulse input to an analog circuit

I have been struggling to solve an issue about signal conditioning an instrument with an analog circuit. First I would like to explain the instrument very briefly: There is a windmeter which is ...
563 views

### Circuit activated by pulse

Looking for a simple circuit which output is only active when its input is a low frequency (0.2-0.5Hz) pulse. The circuit output should be deactivated if input is unchanging. I tried monostable 555 ...
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 ...