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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 ...

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Measure pulse width with STM32L0

I want to get data from a HC-SR04 sensor with a STM32L0 board. The way to obtain the data is the following: I need to measure the echo pulse width but I do not know where to start. Do HAL libraries ...
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Generate +V and -V pulses using a polarity-switching 12V long pulse

No idea how to best word the title... I have a +12V signal leaving an instrument that lasts for 10s. Later, the polarity of the signal is switched to -12V for 10s. Basically it's a motor control ...
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46 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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32 views

Solving a RLC circuit with a charged L and C

I've the following circuit: The input current is given by (the pules endures \$1/20\$ seconds and starts at \$t=0\$): $$\text{I}_{\space\text{in}}\left(t\right)=\max\left\{\mathcal{L}_\text{s}^{-1}\...
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69 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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29 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
43 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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39 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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84 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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38 views

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
35 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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371 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
33 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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32 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
85 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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33 views

Comparing Pulse and wave

Im new to PWM and I have tried to generate some pulse. I have made a simulation that generates the command I should send to a servo in order to make a wheel move the direction I want (lower graph). ...
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26 views

NDT Pulse Generator Circuit Design with EMAT transducer

I have a research topic about pulse generator circuit for NDT. The transducer is from Yushi NDT, and it has almost no datasheet or documentation, and they doesn't provide if it is a EMAT transducer or ...
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2answers
75 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
36 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
88 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
112 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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87 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
103 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
34 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
111 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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103 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
761 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
46 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
396 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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85 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
59 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
39 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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72 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
86 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
124 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
218 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
82 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....
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1answer
134 views

How to shorten the width of a single pulse

I want to shorten the width of a single pulse to 50ms or 100ms width. For example, a circuit generates a positive pulse of duration 1 sec and I need to reduce its width to 50ms, synchronized to the ...
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1answer
67 views

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 ...
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1answer
15 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.
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1answer
101 views

frequency counter [closed]

I am an amateur in electronics and am going to make an RF frequency counter. So after searching, I selected this circuit but my input signal is RF while the input of the circuit is a pulse. For ...
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1answer
162 views

Spice simulation of 555 flasher will not oscillate

I am hoping that this is a very simple question. I am trying to simulate the circuit in ngspice, but it seems that the oscillation will not initiate. I delayed the on pulse, but the expected 20Hz ...
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3answers
278 views

Reset pulse generator for ESP8266

I am trying to generate a reset pulse in order to wake up an ESP8266 device. The ESP8266 supports a "deep sleep" function, in which it consumes very little power. However, the only way to wake it up ...
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1answer
121 views

Ringing in the output of 555 timer

I am using a 555 IC to get 10KHz-50% square wave.Everything goes as expected Except for large ringing(About 2V above the normal 9V high voltage) during the rising Edges of output. I put 0.1uF and ...
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2answers
60 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 ...
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3answers
93 views

1Hz pulse generator - LVCMOS 1.8 output

I am pretty new to electronic design so sorry in advance if the question is too naive. I need to build a small portable 1Hz pulse generator and connect it to a FPGA input pin, configured in LVCMOS 1....
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1answer
71 views

Step up voltage Transformer for more watt?

Using generator in mountain or underground tunnel location, construction workers from portable generator gets maximum: AC Output: 220volt as 200 to 250watt Now, they need to use a machine for ...
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36 views

Shaping negative pulses to positive ones pt2 [duplicate]

I asked a questing a few weeks ago, and asked a follow up question as a answer to that post? Apparently that's not allowed, so I am making this post instead. The question is based on this thread: ...
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2answers
69 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 ...