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# non periodic super imposed pulses

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• ## How to stretch ON time of a pulse train when keeping the periods unchanged?December 10

I'm receiving varying frequency pulse train with very short ON time and I want to convert these to pulses with longer ON time but without changing the pulse periods. On time is now around 100us. Pulse period varies between 1000us and 2500us. The flip

• ## Detection of weak periodical sound signal having negative SNR (will lock-in-amplifier be useful)July 4

I'm trying to understand whether it is possible to detect human's heartbeat from a distance. I'm not a specialist, but it seems to me that the following issues must be addressed: Very sensitive microphone is required The signal I want to detect will

• ## periodic boundary conditions and NDEigensystemDecember 5

Mathematica 10 has a splendid new function, NDEigensystem, that makes it possible to solve Sturm-Liouville problems numerically in a single step. I have not however been able to find a way to get it to solve a problem with periodic boundary condition

• ## How does an electronic caliper work?November 14

How do these electronic calipers work?: I know they work by measuring the capacitance of the running track, somehow. But how do they use capacitance to measure distances - is it a linear relationship of capacitance to distance, or is there something

• ## How to read serial data from oscilloscopeJuly 29

I have a microcontroller (PICAXE 20X2) and a pot meter. I programmed the micro so that it sends any change of pot meter to serial port of PC. Obviously it is a 8bit ADC. Now the interesting thing for me is being able to decode this serial data on the

• ## Determine suitable resistor for the base of transistor as switch (NPN)October 30

I have designed a program to count the frequency and time period of the pulse generated by a 555 timer IC using PC Parallel port. I've connected a base of BC547 (NPN) transistor to the output pin (no. 3) with a resistor of multiple values to the IC a

• ## How to find the earliest edgeNovember 10

______ A _____| |________ ______ B ______| |_______ Which edge arrives first? I have two digital pulses that arrive at almost the same time, and I need to determine which pulse arrived first. I need to resolve to ~500ps, i.e. the pulses may arrive 50

• ## Chosing a suitable switch mode power supplyAugust 13

I have an application where I have to drive 40 high-power LED's in short pulses using a LED light controller. I got the part after the light controller dimensioned, so now I just need to choose a suitable PSU to supply the light controller. The PSU o

• ## which RPM measurement method is suitable?May 15

I have a PMDC motor which is electronically controlled for speed. And it is a closed loop system. A proximity sensor is there to measure the speed of the motor and there are 12 bolts attached to the shaft of the motor so that when it rotates the prox

• ## How to read RPM from 3-wire fan - PIC18F4550May 17

I am working a PIC µC project. I am using 12VDC PC fan (Coolermaster) for my application. A part of the project is to return the RPM from the third wire of the fan to an LCD. First of all, How can I read the signal? Is it a sort of pulses every rotat

• ## Interpreting garage door sensor signal using a microcontroller/opampJanuary 3

Edit 3: I had more information to share regarding my question. I am trying to use this garage door sensor in one of my projects. I am trying to use the sensor to detect if a person tripped the sensor. There is really no documentation for the sensor e

• ## Is there difference between Timer vs Counter in ATmega328P?September 7

Is there difference between Timer vs Counter in ATmega328P? Or is it the same thing? --------------Solutions------------- A Timer and a Counter on an ATmega328 is the same piece of electronics. There are three independent timers on the ATmega328. Eac

• ## Do I need zero-crossing detection for controlling a heater?November 30

I need to control a heater element (about 500W) using arduino. For switching part I would go with zero-crossing SSR or zero-crossing optoisolator and triac (the second seems to be cheaper). The question is do I still need a zero-crossing detection fo

• ## Timer for turning LED's on for 4 seconds and then off for about 200 secondsApril 18

I want to build a very small, low power timer that will allow several LED's on for 4 seconds and then off for about 200 seconds, then repeat. 4.5VDC. No programming. Help please - thanks. --------------Solutions------------- If you don't want to use

• ## How do I use pin5 to control duty cycle of a 555 based PWM?June 17

I have built a simple PWM using a 555 IC to drive a motor for an optical chopper and I want to be able to use the output of the chopper signal as a speed correction feedback for the PWM. I think I should be able to do this using pin 5 on the 555 chip

• ## Driving servo with the help of microcontrollerNovember 11

I'm making a driver board for servo TowerPro MG946R based on ATtiny13. PWM parameters have been taken from manuals: signal period ~13 ms, pulse width ~540us - ~2400us (checked on oscilloscope), but servo doesn't breathe. On this site there is a param

• ## Estimating a sinc period and width of a rectangular pulseMarch 13

For a rectangular pulse that has as a fourier transform of a sinc function like so: How can I estimate its sinc period in the frequency domain and compute the width of the rectangular pulse in the point-spread function? I would like to do it in Matla

• ## Discrete FFT of non-periodic signal excited by short pulseApril 8

Say I have a signal F(t) which represents a excitation by a pulse (so it is not periodic and declining to zero amplitude). According to this answer, for instance, Fourier[Data] in Mathematica assumes otherwise. How can I can specify that the data is

• ## Undersampling of a non periodic pulse signalDecember 6

I am starting getting familiar with electronics, consider me as a newbie.. I am facing a sampling trouble with my DAQ system. I have a non periodical pulsed signal with a separation between the pulse that varies from 3 to 6 ms. The pulses' width is 1

• ## FEM - how should I impose periodic boundary conditions in pure space problems?January 14

I have searched other threads, but I was not successful in finding an answer I could understand. Right to the point: how do I impose correctly periodic behavior on the edges of the rectangular region without knowing what the behavior is (using FEM in

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