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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61 views

How is creating a negative delay possible in this case?

I want to create a negative phase shift (delay) from an original clock source: Source will start, but at some point Vout will lead Vsource as follows: How can that be possible?
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78 views

Amplifier diode circuit

I've made a circuit with the schematic: The output pulses are only 1.5 \$\mu s\$ wide; does it make sense? I also want to get wider pulses, increased to 100 \$\mu s\$, is that possible? Is it ...
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Amplifier circuit pulse width

I've made a circuit: Here is link to this circuit emulator: amplifier circuit The first scope is a 10 kHz input generator and the second scope is circuit output. Which element should be changed to ...
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41 views

Photodiode pulse detect system

We have a laser signal detection system as shown in the figure below. In this system, we want to detect the incoming laser pulse. The MCU will detect the incoming pulse and perform its operations ...
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55 views

How does this circuit behave? (cap charge/discharge)

When I pulse, start signal should be at least 50ms HIGH before falling. To do this I must design R and C values to estimate capacitor C1 charge/discharge times. I get the schmidt trigger part, but I'm ...
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105 views

Understanding a sub-nanosecond pulse generator

I have been reading a couple of papers (1,2) that use a Step-Recovery Diode to generate sub-nanosecond electrical pulses, for the purposes of pulsing an LED. I am simply trying to understand the ...
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55 views

Drive NPN from Voltage Regulator?

I am trying to get two disparate camera systems to talk to one another, specifically an Arri camera with a Preston system, and specifically to transmit a tally signal when the camera is recording. ...
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3answers
113 views

Pulse a 555 astable oscillator every second without an additional IC

I am developing a ranging device to help people with blindness. I need to pulse a 38 kHz Infrared LED every 1 second. A 555 timer in astable mode generates the 38 kHz modulation. I'm currently using ...
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116 views

How to turn a short voltage pulse into a long voltage pulse or increase bandpass

First I am not an electrical engineer, but I am on a mission, so please forgive my lack of resources and ability to explain my concepts. I am designing a device for people with blindness. Currently it ...
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100 views

Show polarity of magnetic pulse using two LEDs

I have made this simple circuit: In response to a rapidly changing magnetic field (pulse), the LED blinks. An example of the pulse is shown below: Now I would like to have a circuit with 2 LEDs so ...
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38 views

Voltage droop and bulk capacitor selection

I have a fundamental question regarding bulk capacitor selection for a pulsed power circuit. Assuming I am switching a 2 kohms resistive load using a 2 kV power supply at a switching frequency of 10 ...
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53 views

I am planning to design comparator based on Opamp but I am not getting the exact pulse output in LTspice [closed]

I am trying to simulate this but I am not getting the exact "RECTANGULR" pulse output. Kindly help me to figure out where I am going wrong. I am going to use this circuit as pulse generator ...
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81 views

Pulsed Current Source Across Inductive Load

Just wondering if you guys have any recommendations for low voltage, high current pulsed power supply designs. The current required is 300A for a 0.14mH inductive load with 0.088Ω of resistance. The ...
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143 views

Liquid Resistors

Will a liquid resistor have different values with simple DC voltage versus pulsed DC voltage? And do voltage levels affect the resistance of a liquid resistor? For example, if test a liquid resistor ...
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33 views

How can use grounded primary coil transformer with BGJ/MOSFET

So, I have a pulse signal transformer like this (freq is 1MHz): In the secondary coil I want to get bipolar pulses. How can I make it using BJT or MOSFET switches and wich is better? I know, that ...
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42 views

What material of core should I use for signal 1Mhz pulse transformer

I want to make 1Mhz pulse signal transformer, and I don't know what material should I choose. I found some epcos cores like N49 but it is for power transformers. Also I found some material with low ...
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2answers
107 views

How can I change the rising time of signal pulse transformer?

I have a circuit where MOSFET drives signal pulse transformer, and I want to make variable rising time from (100 to 300 ns). How can I make it?
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70 views

Capacitor based pulse generator

I want to make a simple circuit where LEDs are alternatively turned on. I have, say, 20 green LEDs and 20 red LEDs. The first half second, the red LEDs should be turned on, the next half second the ...
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What's the cheapest way to design this circuit?

I design a board with Power over Ethernet (PoE 802.3af/at) and the standard requires a "Maintain Power Signature" (MPS) signal, which is a 10 mA, 75 ms pulse every 325 ms (roughly 25 % D.C.)....
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66 views

Noise in pulse shaper with wide bandwith (MPPC signal)

I am using an MPPC with voltage amplification with the circuit shown below. The circuit is a pulse shaper to count photons, it counts with 4 amplifying stages (OPA 2846) and a comparator (LT1719) at ...
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67 views

Measuring extremely small inductance (pH) with transient pulse response

I've made an inductor device. It has 2 terminals. It has inductance, resistance, and some parallel interwinding capacitance. I am using a Keysight B1500a semiconductor probe station, which has ...
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37 views

Tachometer pulses breaking down at lower speeds

I have a Noctua 4-pin PWM fan (PWM datasheet) from which I'm attempting to calculate RPM using the open collector tachometer output. I'm producing the PWM waveform using a Raspberry Pi Pico. Here's ...
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1answer
64 views

Questions on building probe station and pulse measurement

I don't have a strong ECE background, so I may ask many naïve questions. I am building a probe station to measure pulses in a micro-coil, which looks like the following circuit. Because I want to ...
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2answers
104 views

What could be the reason for degradation in the pulse shape in this instrumentation?

I'm experiencing long fall time issue for a 0.5ns pulse duration and 3MHz optical pulse source. The manufacturer test report provides the following pulse shape for the optical pulse. I don't know how ...
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53 views

Wake up ESP8266 with wall switch

Using LTSpice and uninformed dabbling I've managed to produce positive spikes from a wall switch that I hope will wake an ESP8266 for use to control hue lights. Once awake the IC will debounce, read ...
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94 views

Converting latching switch to momentary output

I'm trying to get a latch switch to send a pulse for around 3 seconds or so. The pulse doesn't need to be pretty or precise. The circuit will be used to sound a buzzer when the switch is flipped on. ...
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63 views

Strange pulse with N-MOSFET switching Raspberry Pi power supply

My schematic is as follows: 5 volts coming from a lab power supply (10 amperes.) Looking at the voltage input with an oscilloscope, I see this: A strange pulse going up to 5.08 volts every 500 ms, ...
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84 views

Instrumentation for high frequency pulse

to be updated... I have an optical pulsed laser source (has no manual.) Its monitor output has on its certificate for at 3MHz frequency stated as 0.5 ns pulse duration (ON time.) The output supposed ...
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79 views

LTspice: is there a simple way to make pulse voltage source resettable?

I have a circuit in which I have to have a retriggerable one-shot pulse generator. The trigger event is an edge from a comparator. After the edge, a single positive pulse should be generated, duration ...
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36 views

Hardware for time-gated signal

Hey, I am working on a design for an acoustic sensor, I am applying an excitation field at a certain frequency (a) and recording the response of the sensor (b), however, for my application, I only ...
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2answers
125 views

Detecting a missing single pulse of a pulse train

As part of a project I have a 4 MHz pulse train output of a device with 50% duty cycle. I need a circuit which can turn on a relay if a pulse is missing. I can take care of the relay interfacing but ...
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1answer
62 views

Slow down a pulse (like 12hz / 3 to a 4hz output) [closed]

I am trying to output a slower pulse than is inputted into this mystery IC or circuit. This input pulse is digital and lasts for 1/10 of a second. Is there a chip that would allow me to proportionally ...
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1answer
63 views

Can SiC SoA rating be extrapolated for faster pulse widths?

This datasheet for a Rohm SCT3017 silicon-carbide N-channel power MOSFET's Safe Operating Area only extends as fast as 100µs. Why no trace for 10µs? Is it because with an expected gate charge of ...
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2answers
86 views

Viewing 100-200ns pulse on oscillocope

I've recently bought a Gould OS300 twin-beam 20MHz oscilloscope. I'm trying to view a 100ns to 200ns pulse, but I'm not sure I'm using the correct settings. The pulse voltage goes from 3.80V to 0V so ...
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67 views

What is the speed at pulses for a tachometer signal?

I am trying to get the RPM from a tachometer signal using the Matlab tachorpm builtin function. What does "the speed at pulses" mean and how is it related to the final computed RPM?
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1answer
65 views

Astable 555 Timer how to create longer pulse at reset/beginning/turning on

I would like to build simple 555 based fan controller. The requirements are: at start the controller generates one longer pulse (which can be configurable) after one longer pulse it generates PWM ...
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2answers
154 views

How to get a single pulse for 10 milliseconds?

I am trying to get a single pulse of 10 milliseconds on the output of my 555 timer. I following is my schematic: I am supplying 12 V for Vcc. The value of Resistor R and capacitor C is 100 ohms and ...
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1answer
239 views

STM32 timer triggers interrupt immediately aftern CR1->CEN first enable

As is described in STM32: Timer interrupt works immediately, the STM32 timers don't work correctly for their first interrupt. I am using a nucleo STMG070RB. Configuring TIM7 (which is a basic timer) ...
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2answers
55 views

What rise time should pulse have to have desired pulse width [closed]

I have a question regarding my high speed laser driver. I want to have 10ns width pulse. What rise/fall time I would need to have that I can say I still have 10ns pulse. Is there any percentage that ...
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124 views

What electronic component can send pulses? [closed]

In analog hardware synthesizers, an electric pulse is sent by an oscillator to a sound-emitting device for it to create sound at the desired frequency. What device generates this pulse? What is the ...
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28 views

What is the value of voltage controlled switch to demodulate the PAM circuit

What is the possible value of V3 (voltage controlled switch) and the command to demodulate PAM signal?
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1answer
41 views

300ns Pulse Generator to Drive LED

I wanted to use a 555 timer in astable mode to generate a 5V signal to flash an LED on and off. This works fine when the pulse length of the LED is in seconds or milliseconds. But this got me thinking ...
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1answer
139 views

Amplifying pulse from 4 V to 24 V

I currently have a problem where I want to amplify a 4V square pulse signal to a 24V square pulse signal, for a Q-switch input. I tried using op-amps (LM358N) in a non-inverting amplifier ...
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1answer
39 views

Two pulse to create one pulse circuit

I have two pulse quick outputting of an Op Amp at a particular voltage. What I am trying to do is have an output pulse to trigger at the first rising edge pulse and fall at the second rising edge ...
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0answers
56 views

How I can read optical encoder pulses on High RPM

I am working on a project in which I am using two DC motors with encoder but after certain speed ( my DC motor operating voltage is 24 V but when I give it more than 15V )my MCU CC1350 start missing ...
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3answers
370 views

Why does my op-amp circuit output a rectangle wave form instead of sine?

After tons of research on the web I still don't know what the problem is. I'm trying to simulate a non-inverting voltage amplifier. It is supposed to generate a similar waveform but when I use the ...
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1answer
72 views

PIC 18F4550 capture mode

I would like to measure a pulse using the PIC 18F4550 in capture mode. This pulse is generated by the PIC microcontroller itself. For this, I use a function which plays the role of the XOR logic gate (...
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3answers
86 views

What type of relay/switch device am I looking for?

I want to control a 24V primary device based on a digital signal from a secondary device. The secondary device emits a periodic pulse when I want the primary device to be ON and no periodic pulse is ...
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1answer
60 views

How to linearly boost the output of a Gaussian shaping amplifier?

I have a pulse detection set up that takes in analog pulses (with relatively long tails, gamma spectroscopy). This pulse is sent into a shaping amplifier, that removes the tail, and shapes the pulse ...
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2answers
70 views

Inappropriate readings of pulse and temperature sensor (LM35)

I am facing quite a bit trouble with an LM25 temperature sensor. The readings are a bit too high (90-120*C) for room temprature. I have tried thefollowing things to get an expected result but none ...

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