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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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48 views

iPhone Headphone Remote Circuit [on hold]

I am trying to trigger the camera of iPhone. Tried everything on this but it did not work. I connected a oscilloscope between MIC and GND pins at iPhone Headphone and saw a voltage drop when the ...
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69 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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3answers
116 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
45 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
27 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
51 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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1answer
61 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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59 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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36 views

trigger a circuit using one time signal

I'm really new to electronics and I need help. Say I have Line A. I need to control Line A to set it as HIGH or LOW using a one time signal through one input line X or maximum through two lines X and ...
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3answers
177 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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2answers
520 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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46 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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144 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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3answers
98 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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59 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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4answers
174 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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1answer
2k 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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1answer
55 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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472 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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2answers
496 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 ...
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2answers
53 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 ...
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72 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 ...
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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 ...
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42 views

Remote triggering by using optoisolators

I need to hardware-trigger three modules from a pulse signal source. According to their data-sheet each module requires between 5 to 15V for trigger high and 0 to 5V for low. Each module draw around ...
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2answers
66 views

Hardware triggering multiple devices from a single source for long distances

I need to trigger remote devices through their hardware trigger inputs simultaneously (within 1 ms) from a single trigger source which has a timer output. So basically the 0/5V pulse-train at around ...
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2answers
250 views

What does “max” really mean in gate trigger threshold of a triac?

I am trying to understand the parameter Vgt (max) for a triac (or any semiconductor with a gate threshold parameter), mainly the max. part of it. For example, on page 2 of the following datasheet: ...
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1answer
86 views

Step up voltage Transformer for more watt?

Using generator in mountain or underground tunnel location, construction workers from portable generator gets maximum: AC Output: 220volt as 200 to 250watt Now, they need to use a machine for ...
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1answer
75 views

Triggering an LED Flash [closed]

I have an LED Flash which I want to trigger on and off just before and after my camera captures an image for a Machine Vision application. Any ideas on what circuit set-up I can use for doing this? ...
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1answer
546 views

How to implement a negative edge triggered D Flip Flop (Master Slave Configuration)?

Can you please post a picture of the implementation of such flip-flop at logic gate level? How can I easily change a positive edge triggered D Flip Flop to a negative edge? Also, how will the truth ...
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3answers
148 views

Detect voltage below 0.7V? [closed]

I have a LED in circuit which I want a circuit to detect whether it's on or not. I have found ground and +ve of the circuit. And I checked the voltage across +ve of LED and Ground, when it is ON, it ...
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0answers
152 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 ...
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1answer
175 views

How is the trigger pulse of the 555 timers generated? [closed]

I would like to connect an operational amplifier to the trigger circuit which then generates the pulse that starts the timing of the timer almost always connected to the clock generator. Since 555 ...
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1answer
67 views

Adding Transistor to Maintain Voltage Across Proprietary Switch

So, I purchased a camera trigger that moves the camera and then triggers the shutter. I wanted to change when the camera shutter was triggered so I purchased a cheap eBay delay timer relay. I knew the ...
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1answer
87 views

External Triggering camera

simulate this circuit – Schematic created using CircuitLab Previously my project had two Hitachi camera(http://www.hitachi-kokusai.co.jp/global/en/products/tv/download/gige/pdf/KP-...
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1answer
907 views

SCR triggering using DIAC

I've found this method of triggering of the SCR through DIAC and I'm trying to understand it. I was able to figure out the whole trigger circuit and how to compute the values of RC in order to have ...
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4answers
910 views

Which edge is better for choosing a trigger?

I have a 100Hz signal with a fast rising time and slower falling time. This is the output from a zero crossing detector. The signal is connect to an Arduino input pin. Arduino can generate an ...
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1answer
1k views

555 positive and negative edge detector?

Is there a circuit using the 555 (without additional logic gates) that creates a positive pulse when it detects a rising or falling edge? The goal is to have a circuit that detects when a signal goes ...
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1answer
850 views

Why does this Edge Trigger Work on input of 555 monostable config?

I recently wired up a 555 timer in a mono stable configuration and found that when the trigger was held low for longer than the configured output pulse width, the output would stay high. After ...
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1answer
131 views

False Triggering of when Intergration of TI SE555 with Maxim MAX6866 IC

I am using Maxim MAX 6866UK28D3L+T in my Design with TI SE555 Timer IC , and having some problem of Flase Triggering. Circuit Explain:- WDI_IO is Drive from Micro controller , which Continuous toggle ...
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1answer
230 views

Why do I see multiple waveforms on my oscilloscope in normal trigger mode?

I have two I2C messages 20 ms apart: When I adjust the horizontal scale and look at them in normal trigger mode, I see both of them overlayed over each other: (At least that is what I assume I'm ...
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2answers
170 views

24 tooth input to simulate 36 output

Can someone please help me with code? I have a 24 teeth trigger wheel. Every tooth is registered by hall sensor and I need that Arduino simulate 36 pulse output of that corresponding 24 pulse input. ...
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0answers
189 views

Holding Reset State Low longer with hardware 555 Timer

I have a 555 one shot timer circuit in which the Trigger and Reset pins are tied together in attempt to reset the timer every time the timer is triggered so that the one shot really extends for the ...
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0answers
182 views

What is the correct method for Triac supply?

I need to know what is the correct power supply for fallowing light dimmer circuit that operate by 230V/50Hz AC supply. It should be neutral(N) to MT1 or live(L) to MT1? If can use both, what is the ...
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1answer
62 views

Circuit for Battery powered LED turned on by .15 volts from small wind generator. [duplicate]

Question, How can I turn On an LED powered by 2 AA Batteries Switched on from a low voltage .15v from a small Genorator? When the wind blows The small Generator has a propeller and I would like to ...
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1answer
486 views

How do I find the UTP and LTP of an Oscillator?

I am trying to figure out how to find the UTP (upper trigger point) and LTP (lower trigger point) in this circuit: This is an ideal op-amp being used as an oscillator. My understanding of trigger ...
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1answer
249 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 (...
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2answers
2k views

Inverting Schmitt trigger using uA 741

Inverting Schmitt Trigger was rigged up in the lab using uA 741. The values of R1 and R2 is taken as 10K and Vsat at 12 V and Vin at 1 V sinusoidal input.The oscillation from +Vsat to -Vsat occured at ...
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1answer
364 views

How does this temperature alarm circuit work

Casn you please help me understand how this temperature alarm circuit works? I am a bit over my head here, but I would very much like to understand this. If you would like to look at the multisim ...
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2answers
15k 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 ...
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53 views

protect a driver for steep edges into capacitive load from external voltage

I want to have a 5V trigger output signal that has rising and falling edges of up to 200ns max. into a load of 1-5 nF. I thought about using MOSFET driver circuits (e.g. MC33152, many suppliers have ...