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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61 views

Oscilloscope&function generator, opposite slope traced than trigger slope settings

I am wondering why the signal that was traced on my oscilloscope started on a negative slope when the trigger slope = rising. I externally triggered the oscilloscope by the TTL/CMOS output of a ...
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176 views

Xenon Flash thyristor trigger

I'm building a xenon flash unit with a power of 50Ws (300V 1000uF capacitor). I need to trigger it from a microcontroller. For that I use a MOC3041 to opto isolate my µC from the HV circuit and ...
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2k views

Inverting Schmitt trigger using uA 741

Inverting Schmitt Trigger was rigged up in the lab using uA 741. The values of R1 and R2 is taken as 10K and Vsat at 12 V and Vin at 1 V sinusoidal input.The oscillation from +Vsat to -Vsat occured at ...
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403 views

Help to build a circuit to trigger event only after input signal changes from “1” to “0”

I'd like to build a kind of logic as shown in the picture ,but I can't do it and I really appreciate if someone can help on that. Basically what I'd like to achieve is that when the input signal ...
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712 views

How to view pre-trigger data on digital scope (Owon SDS-7102)

Noob oscilloscope user here. I want to view the voltage rise on my oscilloscope when I connect a device to a 1.5VDC power source, to see how clean the connection is - i.e. how many times the voltage ...
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Triggering a 12 v relay with an arduino

I am trying to trigger a 12 V relay with an arduino input. All I am doing in the Arduino sketch is to make pin 13 go high and low every 1 sec (1000 ms). The relay refuses to get triggered. Can someone ...
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4k views

555 Timer Monostable Mode Self Triggering

I'm working on a simple project with 555 timer. I'm trying to generate a high-state output for 10s when Vcc is applied to the circuit(It is initially off). However, I have not managed to operate the ...
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180 views

24 tooth input to simulate 36 output

Can someone please help me with code? I have a 24 teeth trigger wheel. Every tooth is registered by hall sensor and I need that Arduino simulate 36 pulse output of that corresponding 24 pulse input. ...
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255 views

Smartphone camera wired trigger over audio

I'm trying to build for myself a smartphone camera wired trigger over audio input/output port (a.k.a. 3.5 mm jack used for heaphones/headsets). I'm completely lacking electronic engineering skills (...
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1k views

Drum trigger controller

I'm planning to make a drum controller (something like arduino) for pc using a piezo transducer as sensor, some electronic circuit, keyboard PCB connected to usb and sampler for drums in pc. I found ...
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Trigger modi of an oscilloscope

I'm sure this belongs to the "every once in a while asked again" questions, but I've read several posts on this site and also on other sites and haven't found an answer to two of my questions, yet. ...
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233 views

Very Long Range Beam Break Trigger Sensor

I am having trouble locating solutions for a long range trigger sensor. Want to detect an approaching vehicle 300 feet or more down the road from a pole mounted device. My first thought was a laser or ...
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3k views

STM32F4: How to get data from multiple channels sampled from a single ADC?

So I have searched everywhere for a solution to this problem but I can find anything. I have three channels connected to ADC1 of my STM32F446ZE-nucleo and I want to ...
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187 views

How is the trigger pulse of the 555 timers generated? [closed]

I would like to connect an operational amplifier to the trigger circuit which then generates the pulse that starts the timing of the timer almost always connected to the clock generator. Since 555 ...
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1k views

SCR triggering using DIAC

I've found this method of triggering of the SCR through DIAC and I'm trying to understand it. I was able to figure out the whole trigger circuit and how to compute the values of RC in order to have ...
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142 views

False Triggering of when Intergration of TI SE555 with Maxim MAX6866 IC

I am using Maxim MAX 6866UK28D3L+T in my Design with TI SE555 Timer IC , and having some problem of Flase Triggering. Circuit Explain:- WDI_IO is Drive from Micro controller , which Continuous toggle ...
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242 views

Why do I see multiple waveforms on my oscilloscope in normal trigger mode?

I have two I2C messages 20 ms apart: When I adjust the horizontal scale and look at them in normal trigger mode, I see both of them overlayed over each other: (At least that is what I assume I'm ...
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65 views

Circuit for Battery powered LED turned on by .15 volts from small wind generator. [duplicate]

Question, How can I turn On an LED powered by 2 AA Batteries Switched on from a low voltage .15v from a small Genorator? When the wind blows The small Generator has a propeller and I would like to ...
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519 views

How do I find the UTP and LTP of an Oscillator?

I am trying to figure out how to find the UTP (upper trigger point) and LTP (lower trigger point) in this circuit: This is an ideal op-amp being used as an oscillator. My understanding of trigger ...
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320 views

Relay Trigger Type Is Short

I purchased a 12v Timer Relay that has no instructions but after messing around with it I have it somewhat programmed. My issue now is using the trigger inputs, the relay information states that the ...
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2answers
570 views

Scr triggering design, shuld i use four pulses for each SCR ot two for each pair of the SCR?

I have used a TRIAC and an MOC3021 opto-coupler connected to a PIC16F887A to simulate a a full wave rectifier. I am now to design the same using an SCR h-Bridge. My question is, in order to trigger ...
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176 views

What is the current source for in the Schmitt trigger?

What is the current source for in the schmitt trigger? I can't understand this. Can't see any resistor either.
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174 views

What can the reason be to choose this specific op-amp as a Comparator/Schmitt trigger?

A rotating instrument is outputting AC sinusoidal wave where both the frequency and amplitude of the output is proportional with the rotation speed. This output then goes to a converter box, which ...
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368 views

Level-triggered mono-stable multi-vibrator running at 12+ volts.

I need a CMOS (preferably dual) level-triggered mono-stable multi-vibrator that runs at least 12V (better at 15~18VDC), perhaps in the CD4000 family. Everything I have found is edge-triggered only or ...
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1k views

solenoid hammer trigger control

I am new here and a newbie regarding electronics, I shoot PCP air rifles and have a small project regarding the air rifle. The shooting mechanism is consisted of a trigger releasing a spring loaded ...
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212 views

Adding trigger functionality in for FPGA in ADC capture board

I'm using the LM97600RB board from Texas Instruments to capture data signals and this board contains an ADC as well as a Virtex-5 FPGA. I'm trying to add a trigger functionality to the board using an ...
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RIGOL DS1054Z Fixed trigger time for sweeping using a FeelTech digital signal generator

How do you properly setup a frequency sweep with a digital signal generator and a RIGOL oscilloscope? I've got a setup similar to one in this video: https://www.youtube.com/watch?v=ni07A7sZCPM, ...
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90 views

Reduce overshoot and undershoot of square wave (trigger signal)

I am testing my FPGA board (spartan 6) by taking external trigger signal (square wave 5V 50%.) The rising edge of the signal is shown below with overshoot and undershoot, so my FPGA can not detect ...
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1answer
30 views

driving a medium power darlington transistor with the output of a 555 timer

Question: What is the limitation on the output of the 555 timer with respect to the requirements of the input of the BDW42G? Can the 555 provide enough current at 5 volts to trigger (sufficiently) ...
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1answer
54 views

Make ground signal last longer?

I'm trying to figure out a way to make a ground signal last longer on my car. I'll explain what is happening and what needs to be done. I'm hooking up an factory alarm on my car. It uses a negative ...
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40 views

trigger a circuit using one time signal

I'm really new to electronics and I need help. Say I have Line A. I need to control Line A to set it as HIGH or LOW using a one time signal through one input line X or maximum through two lines X and ...
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270 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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48 views

How to stop summing counter at exact value?

I want to stop summing counter at 25 decimal or 19(hex output) value while it's begin summing from 1 to 31(1F in hex).So how can I make it ?
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57 views

How do I answer to a question asking “Is the purpose of the trigger system to sincronize the signal acquisition with the input”?"

I'm aware you can get triggers from other sources and that in general the trigger syncronizes the acquisition with a trigger event. But as for its purpose, is it always to sync the acquisition with ...
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74 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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43 views

Remote triggering by using optoisolators

I need to hardware-trigger three modules from a pulse signal source. According to their data-sheet each module requires between 5 to 15V for trigger high and 0 to 5V for low. Each module draw around ...
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1answer
77 views

Triggering an LED Flash [closed]

I have an LED Flash which I want to trigger on and off just before and after my camera captures an image for a Machine Vision application. Any ideas on what circuit set-up I can use for doing this? ...
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178 views

Triac randomly triggers when there is noise in the supply [duplicate]

I am using BTA16-800CW (Snubberless version) to control AC appliances (LED lights) and it randomly turns on / flickers when I adjust the fan regulator in the same room (this may be creating some ...
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1answer
72 views

Adding Transistor to Maintain Voltage Across Proprietary Switch

So, I purchased a camera trigger that moves the camera and then triggers the shutter. I wanted to change when the camera shutter was triggered so I purchased a cheap eBay delay timer relay. I knew the ...
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211 views

Holding Reset State Low longer with hardware 555 Timer

I have a 555 one shot timer circuit in which the Trigger and Reset pins are tied together in attempt to reset the timer every time the timer is triggered so that the one shot really extends for the ...
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2answers
221 views

Switching AC or DC signal via TCP/IP [closed]

What is the cheapest/easiest way to switch an AC or DC signal of at least 10 V via TCP/IP? I have 5 measurement devices which can be triggered over an 0-250 V AC/DC input (switching threshold 10 V). ...
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102 views

Manually triggering a low active pin

I have a microcontroller with an active low reset pin. This pin is connected to a timer that periodically triggers a low edge and resets the microcontroller. What would be the best circuit that would ...
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503 views

high value resistors in optical slave trigger? Why?

In a commercial optical trigger, for triggering flash units remotely using the on camera flash, there are very high resistors two 30Mohm in series. Why such a circuit would need resistors so big? This ...
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1answer
90 views

External Triggering camera

simulate this circuit – Schematic created using CircuitLab Previously my project had two Hitachi camera(http://www.hitachi-kokusai.co.jp/global/en/products/tv/download/gige/pdf/KP-...
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1k views

how to close the circuit by relay with a pulse and my circuit stay closed until another pulse comes

I am new in this kind of stuff so please excuse me for my lack of knowledge and English Language :) I have an old car and I want to make a circuit with an LED that lights when car is switched ...
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1answer
181 views

using TSOP4838 in anti-collision line follower

i want to use IR sensors with emitter part ( IR led ) - calibrated with an IC timer to give 38KHZ IR signal - mounted side by side - not face to face like the counter module - to the receiver part ( ...
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1answer
244 views

Undersampling of a non periodic pulse signal

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 ...
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157 views

Detect voltage below 0.7V? [closed]

I have a LED in circuit which I want a circuit to detect whether it's on or not. I have found ground and +ve of the circuit. And I checked the voltage across +ve of LED and Ground, when it is ON, it ...
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1answer
62 views

Detecting mains power change: One signal when on, another signal when off

I'm trying to connect a timer output wirelessly to another circuit. These are on two separate power lines (different phases, circuit, long distance), so I thought of connecting them wirelessly, I'll ...
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585 views

How to implement a negative edge triggered D Flip Flop (Master Slave Configuration)?

Can you please post a picture of the implementation of such flip-flop at logic gate level? How can I easily change a positive edge triggered D Flip Flop to a negative edge? Also, how will the truth ...