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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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52 views

Controlling a FESTO solenoid valve with Raspberry Pi - Trigger Issues

I'm currently working on a project for university, where I want to control a Festo solenoid valve (MHJ10, https://www.festo.com/cat/en-us_us/data/doc_enus/PDF/US/MHJ_ENUS.PDF) via a Raspberry Pi GPIO. ...
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56 views

Sending / Receiving trigger signal wirelessly or through Ethernet

Simple engineer with no background in electronics/electrical engineering here. I have 2 instruments (emitter and detector) that are synchronized by a Trigger signal. This signal is sent via BNC cable. ...
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23 views

One-Shot circuit has problems with slow voltage ramps

I'm using this circuit: simulate this circuit – Schematic created using CircuitLab The circuit is powered by "24V" , "24V ENABLE" is the trigger. The circuit should act like ...
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90 views

555 timer won't trigger monostable mode unless I add a switch between R12 and ground?

I have this setup which is a part of a bigger circuit to control motors. This is supposed to be a timer in monostable mode with about a minute of hi output when triggered. The lines going down are to ...
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39 views

How can i turn a DPST button in to a DPDT?

How can i turn a DPST button in to a DPDT? I've replaced all the stock rocker switches in UTV, got all 14 of them done except for one all to Push Buttons. The push buttons are SPDT, "on/on" ...
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72 views

Moving AI IP into new FPGA. Is the trigger for reading ROM an address change?

I'm confused about the trigger for reading ROM. I want to read one of 4 k bytes but it appears the clock is free running and may be continuing to read the same address while I'm processing the byte I ...
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106 views

Analog Oscilloscope Flickering Signal Problem

I am using BK Precision 2125C Dual Trace Oscilloscope (30 MHz), which is analog. I'm trying to observe signal generated by the output of microprocessor. I'm seeing flickering signal (quickly moves ...
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133 views

What kind of electronic component is this?

I am trying to repair the flash of a P900 camera, since it gives a burning smell after being used. After disassembling the flash unit, I came across this part for which I need some professional eyes ...
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59 views

Oscilloscope: trigger and multiple periods of the signal

I am trying to understands the basics of an analog oscilloscope trigger. As stated here, Instead of collecting a single snapshot of the input signal, an oscilloscope repeatedly updates the display ...
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59 views

Low latency wireless trigger

I am working on a project consisting of a sensor and receiver connected via Bluetooth 5.2. When the sensor receives a start signal from the receiver, it will begin sampling readings at ~10kHz and ...
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2answers
105 views

switching off 555 timer with trigger button

I am new to working on 555 timer. I am running it in monostable mode. I am triggering it using a button on trigger pin. It works just fine. What I want is the LED connected to the out pin 3 to switch ...
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37 views

Triggering a relay with S/PDIF?

I would like to use my audio interface to trigger a mains relay, as soon as the audio interface is turned on. Unfortunately, the interface turns on electronically, as opposed to using a mechanical ...
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1answer
174 views

Reset and trigger 555 timer with one push button

I want to turn on a LED with a single push button. When the button is pressed, the LED has to be turned on for an X amount of time. But what I also want, is to turn of the LED with the same push ...
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1answer
620 views

Rising Edge vs Falling Edge D Flip-Flops

Is there any difference between a rising edge and a falling edge triggered D flip flop? For example, a falling edge flip flop will be faster or if there will be any change in result. Is it correct for ...
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1answer
69 views

Can a feed wire also be used as a relay trigger?

Can I use a low voltage wire (10.5 V) as a supply AND trigger With a single pole double throw relay? Is there a solid state option available? I need a way to switch power back and fourth to LED lights ...
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41 views

Is this implementation of activating of boom-arm vehicle barrier correct?

Previous Post From my previous, I asked about how the trig pin works on the boom-arm vehicle barrier. I would like to know if the below circuit is correct? This circuit assumes the boom barrier opens ...
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51 views

LM555 no output even when trigger is high or low

Good Day! I have been banging my head on the desk because I am failing to get the attached circuit work after PCB assembly. I am using Circuit Wizard and my circuit diagram and PCB simulation works ...
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1answer
93 views

Understanding of how the trigger connector works on a boom-arm vehicle barrier

I would like to know how the trigger (TRG) pin works on the boom-arm vehicle barrier. From my understanding looking at the circuit below for an external radio receiver, when the trg pin is grounded is ...
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247 views

STM32 - Configure Output Compare Registers on the Fly

since this is my first, feel free to give newbie a feedback :) I have a following setup with my STM32 Nucleo (simplified, ignore the HW behind): a) one input signal acquisition (Square wave, consider ...
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1answer
88 views

Why does Basler GPIO need to have an external powersource + resistor to its GPIO output

Background We are usingzBasler camera with an output trigger. The camera output gpio is 3....
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2answers
128 views

A circuit that converts contiuous pulse signal to a stable level signal, and reverse if pulse not present

I have a 12V 3-pin computer fan that has a tachometer signal output: when the fan is spinning normally, the tacho wire is either floated or shorted to ground periodically. If you connect a pull-up ...
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2answers
71 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 ...
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581 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-...
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3answers
170 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.
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49 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 ...
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189 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 ...
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120 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 ...
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1answer
59 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 ...
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1answer
63 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 ...
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2answers
139 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 ...
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1answer
73 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 ...
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2answers
471 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 ...
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78 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 ...
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79 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 ...
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1answer
131 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 ?
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90 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 ...
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975 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 ...
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470 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 ...
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1answer
111 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 ...
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73 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. ...
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283 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, ...
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1answer
78 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 ...
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198 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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4answers
215 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. ...
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1answer
77 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 ...
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1answer
113 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
58 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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88 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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1answer
76 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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3answers
2k 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 ...