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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68 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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66 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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48 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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37 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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56 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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43 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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46 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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79 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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64 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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116 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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103 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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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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99 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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60 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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55 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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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 ...
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45 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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135 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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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 ...
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212 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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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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67 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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127 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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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 (...
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59 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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447 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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323 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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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 ...
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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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155 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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77 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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162 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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172 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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67 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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87 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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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 ...
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68 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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68 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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1k 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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5k 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, ...
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55 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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339 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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352 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 ...
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157 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 ...
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460 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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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 ...
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126 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 ...
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677 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 ...
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703 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 ...