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.

Filter by
Sorted by
Tagged with
0
votes
2answers
60 views

Switch that triggers at 2V

I have a piece of electronics that acts as a event sensor and its trigger voltage starts around 3.3V. Lets say that I want to little bit hack this device and hook it up to a button that is on other ...
1
vote
1answer
347 views

Simultaneous electronic shutter release for multiple Lumix G7 cameras

I'm trying to trigger six Panasonic Lumix G7 cameras at once. The trigger mechanism uses a four pole 2.5 mm plug, some resistors and two switches. With no switch closed there is 41 kilohms of ...
1
vote
2answers
297 views

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 ...
0
votes
0answers
43 views

Triggering BT139 triac with MOC3063 opto triac

First time poster having some problems with triggering triacs. I'm well aware of the dangers of working with mains voltage and I'm very careful. I'm using one BT139-800 triac to switch a 35W single-...
0
votes
3answers
91 views

how to solve the phase shift of a ne555 timer

Why is the first pulse wave is not the same as the rest of the wave in this 555 timer? Is there any way to remove the wave before 2 ms or is there anyway to make it same as the rest in the graph.
0
votes
0answers
81 views

Converting a NPN Circuit to PNP

I've got an exact circuit diagram of the circuit in NPN, but I need to convert it to PNP. Could someone help, please? I've got a 2N2907 with me right now and I want to make my High Level trigger into ...
0
votes
1answer
37 views

How to convert any periodic signal to a square wave signal using the Schmitt Trigger?

I had to make a kind of frequency meter, and what made me stuck was the signal formatting. I couldn’t build a circuit containing the Schmitt Trigger, which will allow me to convert any periodic signal ...
4
votes
2answers
911 views

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 ...
0
votes
2answers
54 views

Weak signal via pull up resistor?

I am trying to trigger a camera from another primary camera. The circuit diagram provided is as follows: The signal to the input is suppose to be a positive square wave. So 0V..and a peak to peak of ...
1
vote
1answer
42 views

Timed one-shot circuit to drive laser module

I'm trying to adapt my Match Guns MGH1 (Air pistol with electronic trigger) to use trigger a laser when shooting. Currently the trigger circuit is driving a solenoid. The circuit board seems to have ...
1
vote
1answer
53 views

Blinking an LED once when a slide pot is pulled to ~zero ohms

I am developing a little circuit to control a servo linear actuator that is used to control fine injection onto a microscopy set-up. I am using a 555 circuit (see below) to generate the PPM signal ...
0
votes
0answers
15 views

Using a BK Precision function generator to drive an amplifier. How do I trigger the output from the function generator?

I acquired a modern BK Precision function generator (Model 4052) as part of a project to run an amplifier for a piezoelectric device. While I have figured out how to set the appropriate parameters for ...
1
vote
2answers
132 views

Share ground between 12 V and 5 V

I am working on this small project getting a relay to turn on/off the amp. when it gets a 12 V trigger from a netstreamer. The relay is powered from 5 V USB 230 V adapter. Question: should I connect ...
0
votes
1answer
72 views

What is the best way to turn on 12V light at specific time for 5 minutes? [closed]

I have 12V/3A power supply which is supplying 12V light. I need to turn on light at 6am, 14pm and 20pm for 5 minutes. What is the best way to do that? I was thinking about RTC module which has it's ...
0
votes
2answers
152 views

Python to trigger USB square wave pulse for camera

I'm sorry if this was posted somewhere, but I'm trying to trigger a FLIR camera for acquisition using a USB port. I already purchased a USB split cable, and have queried the ports, so I know exactly ...
2
votes
0answers
45 views

Oscilloscope to Function Generator Trigger Delay

Simple question, is it common for there to be a delay between an external trigger out from an oscilloscope to the trigger in of a function generator? Specifically, I have a Rigol 1054Z oscilloscope ...
-1
votes
2answers
52 views

Can we trigger a mono-stable multi-vibrator( using 555 IC ) using mono audio signal?

I'm working on a project where, a certain low frequency audio spike should trigger the mono-stable multi-vibrator. If we can trigger a mono-stable multi-vibrator using a mono audio signal, how much is ...
1
vote
1answer
126 views

What is edge trigerring and what's need for it?

I was reading flip-flops and the text-book said that we should edge trigger flip-flops. I didn't get what is edge triggering and why it is needed. Can anyone explain me ?
0
votes
0answers
63 views

Delay-off relay trigger from variable source

The application is a vintage motorcycle with electronics (digital speedo) that needs a clean 12 VDC supply. The goal is to add a battery that automatically powers the electronics when the motor (...
0
votes
0answers
187 views

How it is possible to synchronise sensors?

I am wondering how sensors are usually synchronized in time. I would like to synchronize two sensors in order to be sure that at every time-stamp both of them are giving me a measure. What I saw that ...
0
votes
2answers
58 views

BNC Connector/Cable Suggestion

I am not an expert in this area and therefore need suggestion regarding what is the best way out for this case. For my experiment, I am installing a camera that requires a BNC based trigger signal. In ...
1
vote
2answers
292 views

How DIAC works?

I edited my whole post for more refreshed information I learned about DIAC. Let's consider the following circuit and how it works. First of all the Vs must be higher than break voltage of diac, so ...
1
vote
1answer
105 views

UTD2025CL oscilloscope - help with these displays

I have some concerns about a UNI-T UTD2025CL oscilloscope: Why there is more than 1 sine wave in the screenshots? Is that normal? The screenshots show a TL431 regulator output. The coupling is set to ...
1
vote
0answers
50 views

Why is my replacement triac not working?

I have a Hakko FX-888D soldering station which stopped heating the iron. I found out that the triac (which is a BTA06-600b) went bad so I went ahead and replaced it with a BTA12-600bw. It didnt work. ...
1
vote
2answers
20k views

How does external trigger work in an oscilloscope?

I'm having hard time to find any easy explanation to understand how triggering and especially external triggering works. And it is even more confusing when a function generator's SYNC/TTL output is ...
0
votes
0answers
108 views

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, ...
0
votes
4answers
168 views

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. ...
1
vote
1answer
76 views

Detecting “quick falls” in signal

I am conditioning the input of a slowly drifting analog input sensor. The sensor is a phototransistor that will sink a small amount of current when "dark" and 50x more current when "bright," but the ...
0
votes
4answers
405 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 ...
0
votes
0answers
146 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 ...
0
votes
1answer
5k 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 ...
1
vote
1answer
65 views

Sine to sqare waveform but with variable peak-to-peak input

I need to calculate the speed of a little generator that produces a bipolar sinusoidal waveform with a peak to peak voltage value variable with the velocity. The produced signal also has a frequency ...
0
votes
1answer
77 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) ...
0
votes
1answer
56 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 ...
-2
votes
1answer
64 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 ...
0
votes
1answer
67 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 ...
0
votes
2answers
62 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 ...
0
votes
3answers
909 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 ...
0
votes
2answers
4k 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, ...
0
votes
0answers
54 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 ?
0
votes
3answers
310 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 ...
1
vote
3answers
278 views

Can I use the external trigger to simultaneous capture waveforms on two oscilloscopes?

I want to look at synchronization in a 6 oscillator network (oscillators are about 100 kHz, 1.5 V_pp, if this matters). I have a 4 channel oscilloscope (Tektronix TDS 2024B) and a 2 channel ...
1
vote
0answers
130 views

1.8 V to 5.0 V level shifter with low delay and low rise time

i have a problem with finding the right components and circuit for the following problem. I have a device that is producing trigger signals with a length of 100 ns at a amplitude of 1.8 V (left part ...
1
vote
1answer
115 views

Trigger Edge Detection Voltage issues

I'm trying to get an ESP8266 to wake up via external trigger. The trigger in this case is a PIR, which sends a 2+ second high signal when motion is detected. I'm using an edge detector to turn that ...
0
votes
1answer
638 views

How to make a circuit to trigger a relay once the cell voltage reaches 83.5V DC

I need to make a circuit that will trigger a normally closed relay to cut a signal. I have a 12V power supply DC I need it to trigger once the main system reaches 83.5V DC Needs to be powered by the ...
3
votes
2answers
668 views

How to measure switch bounce on a CRO?

I want to measure switch bounce, but all I have is access to an old CRO. Based on inputs from this forum post, I tried the HOLDOFF knobs and other buttons too. Nothing worked. In the case of modern ...
0
votes
0answers
282 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 ...
0
votes
1answer
94 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 ...
5
votes
2answers
1k views

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 ...
0
votes
1answer
305 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 (...