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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Switch Drive High-power MOSFET Trigger Module not working

Hi! I am trying to get 24V output at 5kHz frequency (square wave) from a microcontroller at the 5V-5kHz output. I am using High-power MOSFET Trigger Switch Drive Module. I connected 0V to DC- and 24V ...
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Why TRIAC is not triggering?

I'm trying to trigger a TRIAC BTA16-800 using an MCO3021 optocoupler. I have a two-channel power supply, in one of them I'm pulsing the optocoupler at 120 Hz and the other channel is configured as a ...
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To trigger ON & OFF of an emergency light with external signal

I need to trigger ON an emergency lamp with a (1st signal) signal, and the lamp will be lighted up until the next (2nd signal) signal is received then the emergency lamp will go OFF. How could I do ...
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Adding a buzzer to an existing LED

I have a set top box. It has a 3 mm green LED (on the front panel) that lights up when I connect the dish coax cable (signal LED). I measured the voltage across the LED. It has 0 V when the dish cable ...
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CD4069 toggle switch

How to connect the trigger out instead of the switch? Like a toggle switch. The first trigger out activates the relay and remains ON infinity, the second trigger out deactivates the relay and remains ...
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Confusion with trigger controlled analogue output of a DAQ board

I came across this article, and regarding the DAQ trigger and analogue output part I'm confused. If I don't get it wrong the DAQ generates particular analogue voltage levels for X and Y of the galvo-...
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How to trigger an 8 channel relay module with an air coil and moving magnet

I just bought this 8 channel relay module on Aliexpress, and I'd like to try to trigger it using an air coil and a moving magnet, but I'm unsure how to connect the coil to the trigger and collect the ...
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At what value should I choose the MOSFET resistors for the MOSFET triggered by the MCU?

I have added a picture of my circuit. Vcc = 5 V and Rled = appr. 600 Ω. So, I_Rled_current = 6-7 mA. The MCU is an ATmega328p. MCU pd1 and pd2 are logical high and logical low. What should the values ...
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How to stabilize this CV triggered toggle (555 timer latching switch) when fed with two gates?

I created the prototype for a modular synthesizer module. The project goal is an AND gate that is fed with two control voltage inputs (A and B with an Vpp around 5V). There will be two outputs: the ...
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Advancing the clock of a CMOS IC with multiple signals

What would be the best way to advance the clock of a CMOS OC from multiple signals? In my situation the "upper" signal puts the system in working and the system itself generate the next ...
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Level shifting a non-periodic signal

I have an RFID reader that sends a high 5V logic level when it is triggered (RFID tag is seen by the antenna). I want to then use this 5V output to trigger an ESP32 to turn on an LED and also send an ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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