Schmitt trigger?

Can someone explain to me how a Schmitt trigger works like I'm a 5 year old? Thank you

Posted by Grizzly_Bear 6 years ago  |  last reply 6 years ago

True trigger

I need help putting a true trigger on my gun

Posted by lib7 11 years ago  |  last reply 7 years ago

trigger in front of hopper?

How bad would a trigger be if it was in front of the mag, for example an uzi, the ram rod will be pushing the ammo but both ammo and ram gets held back by the trigger so no time to accelerate.

Posted by Katarukito 10 years ago  |  last reply 10 years ago

Audio Triggered by Light

Hello, I'm an absolute beginner and I would appreciate some help. I need to build a sensor that triggers sound either on Pro Tools/Logic Pro/Garage Band or any other kind of audio software when it detects a single red flash of light on it, much like the light a laser pointer would produce. The light will flash from left to right in intervals of 2.5 or 5 seconds apart. The sound is nothing too complicated. It's basically just single notes, pitched a fifth apart so for example, when the left light flashes, it needs to trigger middle C, then when the right light flashes, it needs to trigger G above middle C. Problem is, I do not know how to go about this and where to start. I would be deeply appreciative if someone could help me out here and point me in the right direction. Thank you!

Posted by shuraifa 4 years ago  |  last reply 4 years ago

help on a trigger system?

im trying to make a my own airsoft gun, but i am stuck.i cant figure out how to make a truigger that will work. any help? (the pictures should help) i need something that im able to cock and it will stay until i pull the trigger. please helpppp.

Asked by andyweigl 8 years ago

help making a trigger?

im trying to make a my own airsoft gun, but i am stuck.i cant figure out how to make a truigger that will work. any help? (the pictures should help) i need something that im able to cock and it will stay until i pull the trigger. please helpppp.

Asked by andyweigl 8 years ago

What is a block trigger? Answered

A block trigger,like on a knex gun.

Asked by TOMNDAN 9 years ago  |  last reply 9 years ago

Knex Gun Triggers

It has come to my attention that there is some controversy surrounding Knex gun triggers. I know very little about Knex guns and have become extremely curious as to why this was. What is a block trigger and why is it inferior to other forms of triggers?

Posted by randofo 10 years ago  |  last reply 9 years ago

How to trigger a pager?

Asked by owen.scheidel 4 years ago  |  last reply 4 years ago

The best slingshot trigger

 I'm working on a slingshot gun but icant make a trigger for it could someone please leave a link for a good slingshot trigger its an 3 layer barrel(3 orange connectors)

Posted by Merugop 9 years ago  |  last reply 8 years ago

Arduino NFC trigger? Answered

Hi, I'm making an Arduino powered NFC trigger? I want to control it from my phone. As soon as I switch my phones NFC ON, the Arduino should get triggered. I'm aware that the circuit will contain an Arduino board, a nfc shield , relay. But I need to do this on a budget. So i need to know which is the cheapest Arduino capable of doing this. Also if someone could help with the code. I'm pretty good in electronics. But just started learning the Arduino. Basically heres how it should work. Switch on NFC on smartphone. Go near circuit(Arduino-NFC-trigger) NFC sheild gets activated. This gives input to arduino, Arduino gives output to any output pin. After sometime output stops.

Asked by Jonathanrjpereira 4 years ago  |  last reply 4 years ago

Knex block triggers

Why is everyone so hyped up about knex block triggers, you dont have to go to the block trigger instructibles. If you do go to thier instructible you dont have to tell them thier gun sucks. This whole knex gun thing started out as block triggers.Back then Every one liked them and almost every instructible was block trigger. When oodulumps, Mepain, and all the other good knex builders came in,they started making all this cool stuff that was different than block triggers. After they posted all the cool stuff they had going on, new people came in ,and got inspired to make knex guns. They wanted to post thier guns , so they did. And now that all the older people are so tired of block triggers, they send bad comments to people who are new to knex guns. Which I think is wrong because they are at the level of knex guns that we used to be at one year ago. They only difference is that they came later, and dont know as much as we do. If anyone disagrees with my opinion please comment on why you disagree. Sorry if I had any misspelled words in this forum, or if you did not understand. Please tell me if you do not understand and I will fix that.Thank you for reading.

Posted by fobblewabble 11 years ago  |  last reply 11 years ago

LED with Impact Trigger?

Hi All, I'm somewhat new to the DIY home tech space, so hello :) I'm trying to create a small piece of hardware for a game I'm building at home.  The idea is similar to something you'd see at a carnival or fair... throw a ball at an object attached to a lever, when the lever moves have an LED array flash. I'm hoping you can provide some guidance or insight into where I might begin.  I'm not looking to become a master with this so any sort of kit or maybe even plug and play pieces would be greatly appreciated.  I found these LED rings that I thought might be good for the messages that flash when triggered, although I'm sure I could build them myself for a whole lot less: Thanks in advance!

Posted by sirwoodland 5 years ago  |  last reply 5 years ago

Motion Triggered Horns

I'm starting this one over, I made a mess of the last topic. Essentially what I'm starting with is a driveway wireless alert system (  and a car horn. The car horn is wired to a push button switch. ( What I'm trying to do is replace the [S] (switch) with this wireless trigger. The alarm speaker outputs at a very low voltage, ~0.08v: The alarm LED's output 1.75v (measured from + on the one LED and - on the other, there are three total, in series) What would be the best place to tap in to get voltage from to trigger the relay? I think from the previous post I'll need a transistor switch of some sort? This is the part I need help with. Usage: Tractor pulling hayrack riders over a bridge, I'll place the sensors ahead of the horns so by the time the tractor is at the sensor the hayrack is right at the horns. Hope I posted in the right spot. Thanks

Posted by jinstructr 5 years ago  |  last reply 5 years ago

Need a good universal true trigger system.

I need a good true trigger system that can work with nearly any gun/crossbow. This is my weak point, so if any of you more experienced instructablers have a good system, please answer.

Asked by Zthegreat1578 9 years ago  |  last reply 9 years ago

what is a knex block trigger ? Answered

Can you please explain what a knex block trigger is to me ?

Asked by danny123456789 9 years ago  |  last reply 9 years ago

How to build a voltage trigger?

Need to build a voltage trigger, for a project. This is new for me so i need some tips to get started. the point is to build it, not to buy one. The trigger we are looking for is like the one used in this instructable: Appreciate any help I can get. Cheers=)

Asked by Robootzz 9 years ago  |  last reply 9 years ago

killerks pistol has a block trigger

KillerKs pistol is a block trigger so why is it in a group that hates block triggers?

Posted by King_Banana 10 years ago  |  last reply 10 years ago

How do true sear triggers work? And are they better then regular true block triggers? And why? Answered

Yeah... So how do sear triggers work? And are they better? And why?

Asked by TigerNod 9 years ago  |  last reply 9 years ago

how to trigger a relay with audio signal (headphone)?

Want output from headphone jack to power relay to turn on power amp

Asked by gramparich 4 years ago  |  last reply 4 years ago

3 volt signal to trigger 7 volt? Answered

Ok,so I get a 3 volt signal from a detector and use this 3 volt to trigger an alarm which atleast need a decent 7 volts to function.The detector could take a max. of 5 volts input which I got from the 7 volts DC supply.This 5 volts fed,gets transformed into 3 volts after the detection.So let me make this clear,I have a 3 volt and a 7 volt supply.I need to use this 3 volt to trigger the 7 volt circuit.I know what you are thinking-a relay !right?but I couldn't get  a 3 volt relay anywhere(though I got a 5 volt relay).I can tackle this situation in two ways.1)Either by stepping this 3 volt to 5 volts and making the relay do the job.but how? 2)Or some circuit to use this 3 volt to trigger the 7 volts(like a relay but maybe by using ic's).This is the final part of my project and so please help me.

Asked by Adarsh_tronix 6 years ago  |  last reply 6 years ago

Knex gun with a true trigger? Answered

Hi, I keep on finding instructables on knex guns that say stuff about true triggers. What is a true trigger? How does it work???? Thanks from a guy who cant make knex guns

Asked by tjdtjd1 9 years ago  |  last reply 9 years ago

trigger signal for video line

Hi, I'm having a project which need to send trigger signal to oscilloscope. i should make a circuit that will allow me to trigger oscilloscope on specific lines in a video signal. Please give me some idea so i can go ahead. thanks in advance

Posted by sofia14 3 years ago

IR triggered LED strobe

hey guys, im looking to build a IR triggered LED strobe. in the smallest possible size i can. it doesnt have to be from scratch so if anyone knows of a cheap trigger on a toy i could use that would be great. im looking to build an IR triggered strobe for an airsoft gun i have. the idea is to strobe an led (most likely a UV LED) every time an airsoft pellet trips the trigger. these pellets are glow in the dark so in essence i will be making my own homemade airsoft tracer system. these units are about $70 so if i could do this for free or much cheaper i would be thrilled. i know there are things out there i can use but im drawing a blank right now. i have makers block or something. here are a couple links to YouTube vids that explain the concept and more along the lines of what it should be like. at about 1:50 in the top video theres is a good demonstration on its workings. <br> <br> any part suggestions or ideas would be awesome.

Posted by gedion4000 7 years ago  |  last reply 6 years ago

trigger retail door alarm

I know most people that think of retail exit door alarms want to avoid setting them off, but is there a way to purposely trigger them, especially from a distance? i am reasonably good with a soldering iron, ok using a ohm-meter and beginning on using oscilloscope. and i have lots of junk PC/PC parts and various other electronics around to strip for parts... (if that helps any). thank you for reading --rex

Posted by rexifelis 9 years ago  |  last reply 9 years ago

Using a Piezo to trigger lights?

Hey all. What I am trying to construct is some kind of circuit that will trigger an LED when a piezo is tapped. The reason I would like to create this apparatus is to trigger lights using acoustic drums for my band's live show. I would like a light to go off every time a drum is hit and I figured that using a piezo would be the best way to do this. Any help that anyone could offer in this would be greatly appreciated. Thanks again. P.S. I found this diagram for a piezo switch but I am unsure as how i could use this or even how to make it in the first place. I am very new to electronics.

Posted by cimz 7 years ago

why are block triggers bad??? Answered

If somebody makes a knex gun with a block trigger 95% of the time they have bad comments about the gun but WHY????

Asked by Tom Buckey 10 years ago  |  last reply 9 years ago

easy knex guns? Answered

Where is some easy knex guns with mags and true trigger

Asked by MattySmith 8 years ago  |  last reply 8 years ago


Finally! a group that doesn;t allow killerks block triggers. no effense killerk but your WAY to popular!!!!!!

Posted by chopstx 9 years ago  |  last reply 9 years ago

single pulse input, permanent dc output ?

I need to glow a LED permanently on 5v single pulse as input  till it is reset manually, what circuit should i use? For project work? Please help.

Asked by AjayG28 2 years ago  |  last reply 2 years ago

Need Crossbow Trigger Help

I need some help with this heavily modded Reaper, I need a sturdy trigger to fire the crossbow, but that has been proven too difficult for me as I don't have much trigger mech experience. At one point I had it fully working when not loaded, untill it snapped the trigger when I tried to fire an arrow. :P

Posted by Wicky 10 years ago  |  last reply 8 years ago

Is there a name for ''true block triggers''? Answered

Also do you think its okay to use it for a knex gun?

Asked by PotatoCoffee 7 years ago  |  last reply 7 years ago

IR triggered LED strobe? Answered

Hey guys, im trying to make an IR(or other) triggered LED strobe. im including a you tube video so you can see what trying to make.  any suggestions?

Asked by gedion4000 7 years ago  |  last reply 6 years ago

knex RBG true trigger

Hey guys last night i had an idea and straight away got buildin it (not very well cos it was 12 at night). so im gonna post sum pics a bit l8er and then if any1 on this board then maybe u might be able to make it a bit better it is a true trigger but not to good true trigger and it is a RBG so any mods will be appreciated.

Posted by knex maniac 11 years ago  |  last reply 11 years ago

DIY smartphone camera trigger?

Hi, So I just broke my friend's selfie stick while playing with it. I'm wondering how to make the trigger for that stick (wireless or wired is OK). I knew that Apple's Earpod paired with an iPhone would work as a trigger but how about Android phone (I've seen some bluetooth camera shutters but don't know how they work)? Also, if possible, suggest me few things about that monopod because this is my first time in Photography and stuff. Thank you guys. 

Posted by Gandalf OftheinternetI 4 years ago  |  last reply 4 years ago

Marx Generator Trigger question Answered

Is it possible to release the pulse of a marx generator at my own will (after it charges of course)? I was thinking of its possible application in a coil gun, but the fact that the generator pulses automatically would be a problem. Is it possible to create a non-automatic triggering system like a circuit that would allow me to flick a switch and watch the sparks fly?

Asked by Shrix157 9 years ago  |  last reply 9 years ago

schmitt trigger for solar panel

Hi, I'm building a solar panel project that may use the charge battery and so on. As solar output is not consistent, I have a capacitor array to store charge before deliver it to the end devices. However if the solar output power is lower than the end devices(example charging phone) power load, it will probably on and off since the solar output is not enough. I would like to use by capacitor array to reduce the on and off rate by design a Schmitt trigger or perhaps it a flip flop circuit. For example if my Solar panel max voltage is 12v and my  device using 5v thru a voltage regulator that need min of 6v. So I would like to design a circuit to do this 1) When capacitor array discharge to 6v, terminate the circuit to regulator. 2) Wait for the solar panel to charge the capacitor up to 12V 3) Upon reach 12 V, allow the current to pass thru regulator again. Repeat step 1 I tried so search Schmitt trigger circuit but I cannot find the suitable one as most Schmitt trigger  is with a Vref and signal input. Since my voltage input(capacitor charging and solar panel) is variable, I do not have Vref. I still believe it can be achieved, perhaps my mind stuck at one concept only

Posted by SNC1 3 years ago  |  last reply 3 years ago

Motor triggered by a vibration sensor

Hi, my project consists of a vibration sensor that, when enabled, will trigger a motor which will function for a certain amount of time, then stop, and stay in this position as long as the sensor is detecting vibrations. When the vibrations stop, I need the motor to reverse polarity and function in the opposite direction,for the same amount of time as before then stop, and repeat... I'm a first year electrical engineer so please consider me a rookie in this field. If someone could provide me with a suitable electrical circuit, with names and values for the part, i think i might be able to draw the corresponding board. Thanks

Posted by julienfhd 5 years ago  |  last reply 5 years ago

Audio triggered by motion sensor

Hello, I am an artist and want to do a sound installation. Basically I want a movement sensor that activates sounds. There will be about 15 different sounds and each time someone passes by the movement sensor will activate a different track. Can you help me with that?!?!? I need to know how can it be done!!! Thank you Fernanda

Posted by fernandaxr 10 years ago  |  last reply 5 years ago

New slingshot mech/trigger

I want to keep this brief whilst still remaining informitive, please excuse hurried typing hey guys been playing around with knex and found a mech that works. camera cable still lost, paint diagram below instead. to load band is attached to anchor at front, rod it then push/pulled through mech till trigger clickes into place, pulled further and rod is removed, ammo carefully placed back into mech (hollow back) trigger can then be pulled to fire. resultant gun is basicly silent, only one band can be used at a time. plans for a repeating version are still sitting around in my head. sorry for brief explanation, was kinda busy seeya later

Posted by Fred the Penguin 8 years ago  |  last reply 8 years ago

How to make piezo trigger lights?

Hi, I wanted to make a piezo trigger that everytime it hits, it lights up a 2 meters led strip. I found a schematic, but have no idea how to read it. What would I need to get it to light up a 2 meters led strip, running on batteries. I also want it so everytime the piezo is hit, the light flashes a different color. thanks.

Asked by lyoth 6 years ago  |  last reply 3 years ago

How can i make a crossbow trigger?

The trigger needs to cheap and made out of materials anyone could have readily available or that can be bought from a hardware store

Asked by dantheman272 8 years ago  |  last reply 8 years ago

How do I wire a fog machine to be triggered by a motion sensor?

I have a couple fog machines purchased at Target around Halloween last year. The model has a switch on an extension cord which when pressed triggers the fog machine to produce fog for 5-10 seconds. They work great but I want to use a remotely placed motion sensor, like from a motion sensor flood light to trigger the fog machine when people walk past. I purchased a replacement motion sensor module for a flood light and looked at the wiring of the switch and the fog machine but haven't figured out how to properly wire it. The motion sensor module has a "test" setting which would turn on the light fixture for 5 seconds, I want to use this to trigger the fog periodically as people walk past. Any help would be appreciated. A couple photos to show the pieces are included. If more detailed information about the wiring is needed please let me know.

Asked by cbulloch 9 years ago  |  last reply 8 years ago

Attention Electronic DIYers, whats the name of the component?

I want to build a wired remote control that pushes one button on  your computer keyboard. It should be a simple circuit, yet still need the part that actually clicks, pokes or pushes down the key. I can imagine its some form of relay or trigger, but is there any that actually do have an attachment that physically performs the action I am looking for? Any words for what I am looking for? I'm lost.....  Maxxsart

Posted by maxxsart 8 years ago  |  last reply 8 years ago

using TSOP4838 in anti-collision line follower

i want to use IR sensors with emitter part ( IR led ) - calibrated with an IC timer to give 38KHZ IR signal - mounted side by side - not face to face like the counter module - to the receiver part ( TSOP4838 ) which will turn on once something reflect the IR signal back to the receiver. [ the default is that IR signals will go straight forever without being seen by the receiver ]. I've followed the steps of a circuit using IR sensor in an object counter module it included transistors to be triggered instantly as described the problem is that it gives an instant pulse to trigger the 7-segment display. but in here i don't need it to be instant. how could i implement it to make the LED bright as long as i block the path [ not instantly ]. and to be off whenever there's no object in front of the robot

Asked by superdz 3 years ago

Is a laser operated button pusher possible?

We have a business convention coming up soon. Inside of our display case we have this grid of LED panels. The goal of the display is you try and hit a button outside of the case when a certain LED panel is lit To demonstrate human vs. computing reflexes. I'd like to have some kind of external build to demonstrate with as the "vs.". I am thinking I can use a laser and point it at the LED block because lasers are capable of transferring data. I would think it wouldn't be too difficult to make a build that distinguishes between on & off. It's basic binary, on & off 1 & 0, true & false, same & changed. When the surface lights that the laser is pointed on, I think the easiest way to push the button would be to discharge a capacitor into a hobby motor, and some kind of tab or something on the motor. I can go into more detail on the build, but I need more info on making a laser operated trigger system thingy.

Asked by mr monoply33 8 years ago  |  last reply 8 years ago

I want to design a simple circuit that drives a motor and spindle a particular distance, stops, then starts again. Answered

I want to push a button to start a platform to drive a certain distance, then hits a microswitch to stop, then I can push the same button to continue driving the same direction to the next point. The distance cannot be timed because the distance needs to be change by moving the microswitch. I would like all this to be done without a huge PCB, perferably only resistors and 555Timer. And I also want the spindle to stop even if the button is still pressed.

Asked by Uggswhiteguy 7 years ago  |  last reply 7 years ago

Co2 cartridge cannon? Answered

Hi ... in a quandary, and having problems on were to start.  Drawing a blank.  I need to develope a small Co2 cartridge Cannon that will be placed into a 1/12 scale RC airplane, that will be used to deploy a drouge parachute on command.  Can anyone provide me with a starting point?  Do you by chance have something all ready in your files that can be used.  The drouge shute when deployed, is 72" in diameter, and the package that contains the parachute is 3 x 3 x 3.  It needs to be projected at lease six feet from the airplane before opening up. Thank you very much,  for any assistance that you can provide.  Richard T Leiterman ( KE6RIM )

Asked by ke6rim 7 years ago  |  last reply 5 years ago

I need some help with k'nex guns (sear triggers and true triggers)? Answered

Can anyone give me a tip on how to make triggers for k'nex gun,because I just made my file about a week ago,so can anyone help?

Asked by Knave125 9 years ago  |  last reply 9 years ago