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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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Deciding which assembly is more common positive edge detector

I know of two circuits which can act as edge detector: A clock connected as a voltage source across a RC component where resistance is composed of a diode and a resistor and this in series with ...
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97 views

1PPS vs high resolution timer in CPU

We need to use 1PPS (pulse-per second) in our standalone system which is based on arm processor, and has cameras input. The 1PPS is implemented with GPIO which is injecting an interrupt (low to high)...
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28 views

Resolution of FRR Function

I am working with a oscilloscope GWINSTEK gds-2074a. As per the time resolution is concerned, turning the dial all the way down, it shows that it can go down to 1 ns. There is a Delay function in the ...
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How can I delay a pulse by 0.5 s? [duplicate]

I asked something similar here. Now, when I make my circuit, I've seen that I don't need something that gives a pulse after being powered-up, but I just need a delayed pulse. I know nothing about ...
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Is a pulse transformer core fit for a gate drive transformer of a solid state tesla coil? [duplicate]

I'm building a SSTC (solid state tesla coil) and I have a few of the following cores laying around. They are from a computer PSU. Since they're used in high frequency switching, it's logical to think ...
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50 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 ...
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44 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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54 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 ...
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51 views

Generate one-input pulse in Verilog

I'm attempting to port discrete schematics into a FPGA. In the schematics some AND gates function as short pulse generators, when input goes low output is enabled, until input propagates down an ...
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1answer
50 views

Why is the pulse reflection becoming like this in pulse?

I use mosfet to generate a pulse, input the pulse into the transmission line, and after the reflection, test the waveform as shown. Why did the third reflected waveform become like this? I calculated ...
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78 views

Long (500ms) Pulse Extender

I have an SPST momentary tactile switch and want the pulse, whatever length, to be extended to 500ms (unless of course the button is pressed for longer than 500ms but we can ignore that if we hold the ...
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57 views

Why does the first pulse have a different duration than the other pulses?

Why does the triggered astable in the next figure have the duration of the logical component "0" of the first pulse lasting 2 times the logical component "0" duration of the next pulses (see the ...
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Signal response and settling time graph analysis

I have come across a datasheet of an instrumentation amplifier. I have a difficulty in understanding the signal response vs settling time graphs. Can someone please explain figure 28(page 10) of the ...
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37 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 ...
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3answers
99 views

How to make a positive pulse with a button?

I want to make a circuit that sends a positive pulse that gets high for a few nano seconds when I push the button and then goes to low. I want this to happen even if I hold the button down without ...
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2answers
127 views

How to generate a single pulse using RC circuit from a fixed DC supply without any controller, timer or delay IC?

I have a DC supply (5 V) to turn some circuit on and in that circuit there is a module which uses a specific mechanism (i.e. a 2 seconds width high pulse) to turn on (even if a supply is connected, ...
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1answer
89 views

Astable 555 timer circuit that resets on a heartbeat

I'm trying to design a circuit that will reset my ESP8266 when it crashes/hangs. It does this by sending a heartbeat to a 555 timer every minute which resets the 555 timer. The 555 timer is configured ...
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49 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 ...
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71 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 ...
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1answer
36 views

RC circuit with pulse input voltage; finding the time constants

I've the following circuit: Question: What are the time constants of the voltage at node \$\text{Y}_2\$ when the up part of the puls comes and when the down part of the puls comes? MY WORK: The ...
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2answers
55 views

Do ultrasonic transducers generate sound because of current, voltage, or change in either of those?

I have been working on a pulse generator circuit which will be used to drive an ultrasonic probe. In the circuit below, the 50Ω resistor is modeling the probe. I have researched the piezoelectric ...
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1answer
44 views

Rising edge duration of a low to high pulse

In a device I am using, I see the following in the description... "At start-up, the module requires an ON_OFF pulse sent from the host. A second pulse sent from the host will re-enter hibernate mode. ...
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47 views

About measurement of pulse using oscilloscope [duplicate]

When I measured the optical pulse using photo-detector and oscilloscope, some negative voltage was measured after strong peak. What did I get negative voltage? How is it possible?
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1answer
132 views

How to explain the reflected voltage on the oscilloscope when a pulse is sent through a transmission line with a capacitor at the load?

This is waveform that I got on the osciloscopewhen experimenting in the lab. A pulse was sent through the coaxial cable was used with a capacitor at the load. I have my own idea why is this happening ...
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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 ...
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1answer
36 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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383 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 ...
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1answer
98 views

Pulse width of a stepper driver

I have a stepper motor that has 1.3Nm holding torque. Im using TB6560 driver at 3A phase current and half step mode. And also Im using Arduino for generate step signal for the driver. If I generate a ...
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35 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 ...
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1answer
97 views

Impedance matching a capacitor load

I am currently trying to impedance match a capacitor as a load. In detail, it is an insulating thin film grown on top of a conductive layer (grounded). We now sputtered small Pt electrodes on top and ...
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2answers
99 views

Measure average and instantaneous pulse power

1) How to calculate average power by having voltage and current waveforms of one oscillation period that looks like this? Someone suggested me to use: Won't this integration result in "negative ...
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1answer
40 views

VF PWM for varying frequency reference function

I am new with PWM methods and there is a subject that I cant find an answer to and decided to ask here. For a varying frequency PWM (VF-PWM) I have found that by using the following spectral ...
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1answer
124 views

Sync Pulse generator for Composite Video. (Stabilizing video)

I am trying to make a Composite Video Sync Pulse generator with the Help of a micro Controller STM32 , Short story. I have a wireless video source that is transmitted from a VTX So there is a PAL ...
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2answers
121 views

Old-school pseudorandom pulse generator (requesting assistance with hardware design)

I would like to design an old-school pseudorandom pulse generator to trigger various types of events (hardware suggestions only please - no programmable ICs). The events that I want to control need to ...
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1answer
88 views

Generating sinewave from a pulse train by using a micro-controller

I want to create sine waves from 0.1Hz to 10Hz which are controlled from a software. For that I thought I can use micro controller as an interface between the PC and the sine wave signal. But if I ...
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1answer
222 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: ...
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1answer
38 views

Why does a Solenoid driven with intermittent duty cylce produce higher force than with continuous drive?

I'm selecting some solenoids with my MechE and I noticed something that I didn't have an intuitive explanation for. We were looking at this solenoid and noticed that at the bottom the forces ...
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1answer
153 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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2answers
107 views

How do electrons travel in data transmission wires?

I've searched and googled quite a bit on this subject, but haven't found any concrete answers. I understand that pulses are generated at the transmitter's end to get to the receiver's end. More in ...
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1answer
765 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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1answer
54 views

what is the difference between area and magnitude of a pulse?

I have read : "An impulse is a generalized function having infinite length and finite area. It is also known as the Dirac Delta function. Magnitude of an impulse doesn’t make sense , only its area ...
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2answers
436 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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0answers
87 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 ...
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3answers
63 views

Building a device to reduce pulse frequency by a variable amount

A speed sensor on the wheel of a mini motorcycle sends pulses as the wheel rotates. It may send 1, 2 or 4 pulses per tire revolution, so let's say that at top speed, it may have 10, 20 or as many as ...
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2answers
40 views

Does duty cycle have effect on sending pulse train properly for long distances

A system will use coaxial cables to convey pulses to trigger remote systems. The cable lengths might vary up to 100m. In that case, if the duty cycle of a 30Hz fixed pulse train is too low like %0.05 (...
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2answers
77 views

“Fast” pulse (8µs) low current (10µA - 100µA) amplification for optocouplers

I got this problem where a inverted pulse of 8µs has to be amplified because the pulse only delivers 10-100µA. The signal will be transmitted over a optocoupler and sent to a mc that interrupts upon ...
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3answers
121 views

Delayed, active low, short pulse for reset

I am attempting to create a circuit using a TUSB2036 usb hub IC that automatically starts when it is powered on. The datasheet states for the inverted RESET pin RESET is an active low TTL input ...
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2answers
141 views

Searching for a suitable method to detect peak heights of nanosecond pulses

My goal is to digitize an analog signal and measure the maximum pulse peaks via an ADC device. The signal has the frequency (pulse-repetition-rate) of f = 100 kHz. Furthermore, the analog signal ...
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1answer
311 views

Voltage*time product of pulse transformer

I am designing a circuit to excite a piezo-electric crystal with 1MHz bipolar square wave at 30V (Vp-p=30V, Vb-p=15V) consisting of 10 pulses, 50% duty cycle. The idea is to use a pulse transformer ...
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1answer
84 views

Wake me at 6 AM, respecting daylight savings and time-zone. Possible? [closed]

I'm an electronics noob. I want to be woken up at 6 AM every morning (irrespective of daylight savings, irrespective of time-zone) by a device which has no visual display, no wires, and works forever....