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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.

19 questions with no upvoted or accepted answers
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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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48 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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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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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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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 ...
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885 views

How to make pulse wave from sine wave - audio frequency

I'm looking for a quick-and-dirty way of converting something close to a sine wave to a narrow pulse wave. Please see the image: a low bass note played through a broken transformer. I'm trying to re-...
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38 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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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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103 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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1answer
54 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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44 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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49 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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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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76 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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43 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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1answer
75 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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225 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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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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611 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 ...