Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [trigger]

A type of oscilloscope sweep in which a *trigger*, or waveform characteristics matching a user-specified condition, will initiate the sweep. A trigger can also be an event, such as a pulse, which causes a circuit to begin performing some action.

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What does edge triggered and level triggered mean?

I am studying 8085 microprocessor architecture and the terms edge triggered and level triggered confusing me really very much. Can anyone explain me it in layman's words ? While studying the interrupts of 8085 named RST 7.5, RST 6.5, RST 5.5 and…
ATR
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Why edge triggering is preferred over level triggering?

I am trying to understand why edge triggering is preferred over level triggering. In my book it is not explained clearly. After searching online I came to know that edge triggering is insensitive to glitches whereas level triggering is sensitive.…
avi
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What is oscilloscope trigger "sensitivity"?

I'm learning more about digital oscilloscopes (previously have only worked on analog), and encountered a setting for trigger sensitivity, expressed as a value like 0.30 div. Tektronix gives this description: The oscilloscope will trigger on a…
JYelton
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Why does my waveform start ahead of the trigger?

I am learning how to analyze SPI bus clock and data using an entry-level digital storage oscilloscope. I'm using a BK Precision 2542B to measure the output of the clock and MOSI lines from a Netduino that utilizes an ARM microcontroller. In this…
JYelton
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Sine wave to square wave - Schmitt trigger

I need to transform a bipolar sine wave (varies from -5 V to 5 V, 1 kHz) to a square wave for further digital processing (0 to 3.3 V), as in this image: The important thing is that this sine wave can't be distorted, so there can't be any limiting…
przeski
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Capacitive touchscreen

I am doing project in which I want to perform read and write operation by using a capacitive touchscreen. What I know is I can trigger capacitive touch screen by: By using electromagnet as I heard that some of stylus works by using magnet at its…
duelistknight
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trigger alarm with relay from PC sound output

As a total beginner, I have a project of creating an alarm device for a sailing boat. The background is the following: a Mac-mini collects, by means of different computer programs, alarms from different sources. in order to make the sound signal…
anderstood
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What is the difference between the circuits?

I found the trigger (latch) circuit: When no button is pressed, the LED does not light, if you press SW1, the LED will light up, and will light until you press SW2. This can work for different values of the resistors (R2, R3, R7, R8). What will be…
Wind
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Which edge is better for choosing a trigger?

I have a 100Hz signal with a fast rising time and slower falling time. This is the output from a zero crossing detector. The signal is connect to an Arduino input pin. Arduino can generate an interrupt on signal RISING or FALLING edge. I tested them…
user83628
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Breakaway Glass Triggering

I need to electrically "sense" when a brick is thrown through a vertically-oriented pane of breakaway glass, breaking it. My first thought was to paint a thin strip of clear conductive ink/paint/gel across the back of the glass, then treat it as a…
Joe Mac
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Analog oscilloscope triggers

I have recently received an old 70's era Tektronix 465b dual trace oscilloscope. Unfortunately I have close to no clue how to use it. I understand the concept of triggering but this scope has two triggers, named trigger A and trigger B(DLY). Is…
Anthony
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Converting the 400 picosecond pulse train to 15 MHz clock signal

My goal: I am trying to phase lock a 74HC-based digital circuit from a clock reference at 10~15MHz pulse repetition rate. The pulse width is around 400 picosecond. The peak voltage is sometimes below 700mV, depending on the coax cable length. I…
Antony
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How to store more waveform after trigger and less before?

I have a Rigol DS1074Z and can't figure out how to lower the time the scope spends pre-sampling to open up more memory for the actual data I want to see. Here is a nice image that will hopefully explain better: And here is what it looks like when…
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TRIAC self triggering. How can I improve my circuit?

I have designed a circuit board for my Arduino controlled dishwasher, using the following circuit taken from the MOC3043 datasheet. I have used a BTA 16-600BW snubberless TRIAC with a 100 ohms and 10 nF snubbing circuit. I have seen Electrolux…
Mattia Iezzi
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555 PWM motor driver controlled by external analog signal

I used the below 555 timer PWM circuit to control the speed of a dc motor, and it works like a charm :) now i have a requirement to change the PWM speed externally from another module, that module consists from a simple potentiometer, as shown…
Tam
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