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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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Driving 32 SiC MOSFET gate drivers with one function generator trigger signal

I have been having a hard time finding out how to drive 32 gate drivers for SiC MOSFETs from a single function generator signal of 5 V. My function generator is a Keysight 33500B. I'm using Genesic ...
Jay Eifler's user avatar
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1 answer
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Function Between Oscilloscope Trigger and Sampling Storage

I have a query where maybe is stupid but anyway I will dare to ask. How the oscilloscope knows when to start to save the sampling data in his RAM memory in order to process them and display them? I ...
DarkKnight's user avatar
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2 answers
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How to properly trigger and measure a modulated square wave signal with an oscilloscope

I'm having trouble getting a stable trigger on my Rigol DS-1202 oscilloscope for a complex waveform. The waveform is composed of a 25.5kHz carrier square wave modulated by a 200Hz square wave, both ...
raymysterioso's user avatar
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Wide input range Dual Edge Trigger Input (P-Channel N-Channel Linked Pair)

i'm working on a design where I would like to tolerate both source and sink currents as valid inputs, along a wide input voltage range. Specifically, I would like to have an output logic high for both ...
Devon Freeland's user avatar
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1 answer
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Shift Register 4021 Scheme

out of pure interest and a month of free time, I decided to re-create the schematics of some things I had. One of them was the NES controller. I found the schematic on the Internet and decided to make ...
Retro Enjoyer's user avatar
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A sensor's idle voltage is 1.1 V, and its triggered output voltage is 5 V. How can I condition the signal to be <0.2 V idle and ~2.5 V triggered?

I'm triggering a high speed camera with an analog chronometer tower that when un-triggered puts out 1.1 V. When an object passes through the tower, it briefly spikes to 5 V. I'm using an old camera ...
Jake Nixon's user avatar
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1 answer
91 views

555 Monostable Mode Press and Hold Trigger

So, I have a 555 Timer in Monostable Mode, like below. I used a 47uF cap and a 47K resistor for the C and R. I press the trigger switch button and let go, and the output goes high for roughly 2.5 ...
Erik Vincent's user avatar
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1 answer
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What guarantees are there on when GPIO states are read and written?

I'm fairly new to electronics, coming from software engineering, and it's not clear to me when GPIO states are set or read in microcontrollers relative to a clock pulse. If on cycle n, I toggle a GPIO,...
Julien BERNARD's user avatar
1 vote
0 answers
36 views

Generating trigger spikes around a reference

I'm experimenting with a circuit to use a IR2151 (self-oscillating half-bridge driver) as an el-cheapo MOSFET driver. Basically take away the "self-oscillating" part and trigger the high and ...
RudShep's user avatar
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2 answers
68 views

Three wire remote controller - wiring to two GPIO pins

My remote camera trigger has three wires (red, yellow, white). The white is shared, and the trigger can complete two different circuits by shorting it with either the red or the yellow cable. One of ...
Michael Murphy's user avatar
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104 views

Explain schematic for one-shot trigger

Can you please help to explain following schematic: How does this circuit work? What is the purpose of the diode and the capacitor?
moci's user avatar
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5 answers
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How to sense the presence of AC voltage that could vary from 17 V to 230 V?

I have a requirement to sense the presence of AC voltage, that could vary from 17 V to 230 V, and trigger a TLPxxx series optocoupler. The wide voltage range poses a problem in the choice of a ...
Cemtekin Sarper's user avatar
1 vote
1 answer
54 views

Match function generator output phase to line phase

I am new here so my apologies if I am missing pertinent details. I am trying to cancel a 60Hz EM field by sending a small 60Hz AC current through a loop of wire that I am generating with a function ...
Chromel1's user avatar
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1 answer
61 views

DS1102E oscilloscope not triggering above 200mV

Once adjusting the vertical scale of my Rigol DS1102E oscilloscope from 200mV to 500mV the signal appears to be lost. Instead of showing the "T'D" (triggered) icon in the top left it then ...
Tetie's user avatar
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2 votes
4 answers
458 views

Convert a 0 V / 3.3 V trigger signal into a 0 V / 5V trigger signal (TTL)

I have a device sending a square trigger signal 0V / 3.3V, with a BNC connector. (We usually call it a TTL signal, I don't know if it's the common name? is it relative to Transistor-Transitor-Logic?) ...
Basj's user avatar
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12VDC LED blinks when powered by a PD charger using a USB-C decoy module

I am trying to build a low-voltage LED lamp powered by a USB-C PD power adapter instead of a traditional DC power supply with a barrel connector. Several reasons for this: USB-C cable is detachable ...
flux_capacitor's user avatar
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1 answer
78 views

Identify types of circuit(s) that would function as stated

I am trying to build a circuit that will have a trigger input, a clock input and an output that is (10) pulses at clock frequency for each trigger pulse. Would it be multiple circuits (chips) or just ...
bteddy1's user avatar
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0 answers
77 views

I would like to build a delay circuit

I would like to build a latching relay control circuit, controlled by MCU. I'd like to implement the following: The idea is from here: https://pdfserv.maximintegrated.com/en/an/AN3288.pdf The relay I ...
sandor lio's user avatar
2 votes
1 answer
156 views

Capacitor discharging in a low power active-high pulse circuit

Team, Thanks as ever for your wonderful support. Long time listener, first time caller. I trying to make a low power active-high pulse (4-8sec RTC interrupt) when a switch is pulled to ground for up ...
Planestoner's user avatar
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68 views

Signals below trigger level are still captured by the oscilloscope

I use NI's oscilloscope PXIE-5162 to measure the Na-22 spectrum with Canberra's NaI(TI) photomultiplier tube. I notice that although the trigger level is always kept constant at 0.1V, there are still ...
cZe99's user avatar
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1 answer
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Latching interval timer with positive trigger

Can I create a latching interval timer circuit with a 555 chip using a positive trigger (which is not pulsed but remains high during the timing interval and afterwards) without retriggering the timer? ...
billium's user avatar
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1 answer
505 views

How do I get a stable trigger on a digital Hantek oscilloscope?

I'm not a super-expert of oscilloscopes but I used several Tektronix (both analog and digital.) I have a Hantek DSO4254C and I'm not able to get it to trigger on a sine wave coming from my board. The ...
Mark's user avatar
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3 votes
1 answer
407 views

TRIAC self triggering. How can I improve my circuit?

I have designed a circuit board for my Arduino controlled dishwasher, using the following circuit taken from the MOC3043 datasheet. I have used a BTA 16-600BW snubberless TRIAC with a 100 ohms and 10 ...
Mattia Iezzi's user avatar
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1 answer
91 views

Monostable (eg CD4538 channel) connecting rise and fall inputs together to generate pulse from rise or fall

I would like to use one channel of a dual monostable (CD4538) to generate a pulse from either a rise or fall single trigger input feed. If I connect rise and fall trigger inputs together (or use a ...
SPotter's user avatar
0 votes
4 answers
873 views

Confusion about edge/level triggering interrupt

I have read this answer. My understanding is, there are actually 2 lines logically: clock/gating line event/interrupt line And the clock/gating line can make the circuit take event input at an ...
smwikipedia's user avatar
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1 answer
295 views

Read parallel data that is valid in falling edge clock NUCLEO-H743ZI2

I have an external ADC with 2 parallel output pins. Each is 1 bit (2 bits total), with clk_out pin. I am trying to read the parallel pins using a NUCLEO-H743ZI2 (480 Mhz). I followed the AN4666 ...
AHMED's user avatar
  • 3
0 votes
2 answers
178 views

Are false positives from (advanced) IR proximity sensors normal? - VCNL36826S

I am working on project where I am using an IR proximity sensor from Vishay - VCNL36826S. This sensor is observed to give false positives randomly. As I am still trying to catch this rare event, the ...
user14015139's user avatar
1 vote
2 answers
420 views

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 ...
Lucas Mazz's user avatar
0 votes
1 answer
40 views

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 ...
C S Chong's user avatar
0 votes
2 answers
195 views

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 ...
user141178's user avatar
0 votes
0 answers
435 views

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 ...
Smekeri BezPrezimena's user avatar
0 votes
1 answer
441 views

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-...
user16307's user avatar
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1 vote
3 answers
179 views

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 ...
Vince's user avatar
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1 vote
2 answers
87 views

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 ...
mike_lay944's user avatar
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0 answers
100 views

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 ...
BummBummSteffen's user avatar
0 votes
1 answer
53 views

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 ...
NaturalDemon's user avatar
0 votes
1 answer
66 views

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 ...
JoeyB's user avatar
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1 vote
2 answers
461 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. ...
Nina X's user avatar
  • 23
0 votes
1 answer
285 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. ...
Simple Engineer's user avatar
0 votes
0 answers
85 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 ...
Singed's user avatar
  • 457
2 votes
3 answers
395 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 ...
Swooperman's user avatar
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1 answer
161 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" ...
Vince Sodini's user avatar
1 vote
2 answers
88 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 ...
Ralph's user avatar
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0 votes
2 answers
1k 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 ...
lucenzo97's user avatar
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0 votes
1 answer
162 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 ...
abdussamed17's user avatar
0 votes
2 answers
432 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 ...
BowPark's user avatar
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2 votes
0 answers
127 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 ...
Ansel's user avatar
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0 votes
3 answers
460 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 ...
Sahil Siwatch's user avatar
0 votes
0 answers
92 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 ...
pilau's user avatar
  • 113
1 vote
1 answer
905 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 ...
leon bouman's user avatar