How to replace mini microphone with more sensitive mic?

Hi I am trying to replace mini microphone (is very similar to mobile phone microphone) of Audio bug with more sensitive Standard electret microphone with intention that it pickup sound from more than 1 metre distance, and in doing so I am getting too much noise in Audio bug out-put. Do I need pre-amp? Is there any better way to do it? If pre-amp then how to harmonise out put of pre-amp to the input of audio bug? Any help..... Thank you.

Posted by ksaus 7 years ago

How can I make a microphone less sensitive?

I have these microphones for a project I am working on, but they are much too sensitive. Can I put some resistors with them to make them not so sensitive? I basically want them to record only what they are aimed at.

Posted by l0cke 10 years ago

Remote motion-sensitive alert light

I've searched these forums and found some similar threads but nothing specifically like what I'm trying to do. First, I am NOT very DIY savvy. I'm a computer tech and can build a PC from components, but I'm not a drilling, wiring, woodworking type. What I'm trying to make is a small remote motion-sensitive light so that when the motion sensor trips, a small under-cabinet style LED light will come on or just flash a couple of times. I want to be alerted when someone comes to the front door, even if they don't knock. USPS for instance leave packages without knocking and I may not know anything's there until I happen to go outside an hour or two later. Would rather get an immediate notice that someone is there without the expense of a CCTV setup. Any help or guidance on components would be appreciated. Battery powered is fine, and preferably something wireless if possible so I don't need to put holes in my walls. Thanks!

Posted by deitner 9 years ago

I need help hacking a solar light to use as light switch.

I recently bought some hanging multicolored led lights (they look like UFOs). They use 3 "C" style batteries as their power source. What I would like to do is make them light sensitive. Basically letting them turn themselves on when it gets dark. If anyone has any ideas on how to do this, your help would be greatly appreciated. I'll try and post some pics of them later today.

Posted by taz313 7 years ago

Light Sensitive Chicken Coop Door

Hi, I recently started keeping my own chickens and have really enjoyed the whole experience. The chickens were all really friendly and provided hours of amusement. Until a few weeks ago I had 4 of our feather friends in a nice Coop. That was fine until one night, for the first time ever, we forgot to close the door to the coop. Unfortunatley the fantastic Mr Fox must have been casing the joint for some time and siezed his opportunity. Three of the chickens were nowhere to be seen, the fourth lay dead under our rhubarb. So why am I telling you all this sad tale? well, I have stumbled accross a solution to this ever happening again. On Ebay I can purchase a 'VSB Automatic door opener', but it'll cost about £100. This is also not ideal as by current door for the coop opens horizontally not vertically, which would mean replacing the door. I'm also concerned that the light unit will be underneath a roof with this design, so it may close prematurely, leaving the chickens trapped in the yard. I'd like to have a go at making my own automatic closer for the coop, possibly solar powered (with a rechargeable battery) that could be mounted to the side of the coop. I don't mind adapting the door to make a vertical opener, if that makes the project easier. The specs for the bought units are: Compact geared motor with steel gears ensuring extremely long life. Battery life now 3 to 4 years with an HS sliding gate or 2 years with a 1.5-kg sliding gate featuring a 50-cm lift. Dorkeeper operates considerably more quietly now. Thanks to 40-kg breaking strength, the rope can hardly break any more. Electronic shutdown of motor within one second when the sliding gate is blocked.Once the blockage is removed, the sliding gate will be opened within three minutes. The strain on the batteries is virtually negligible. Tensile force: 200 g to to 3 kg, with idler UR on the sliding gate (pulley) 6 kg. Does anyone have an ideas how to make something suitable/similar? I have included photo's of the coop showin the current method for closing (Metal foding arm)

Posted by Nemesis201077 9 years ago

Touch Sensitive counter project question

Hi everyone, Great to be part of this community. I am trying to make a touch sensitive counter, the sensor has to be as flat as possible, something like a thick cardboard, or I can put a flat sensor in between two sheets. It needs to handle about 10-20lbs of weight. It will go under fabric like carpet, so it cannot be super sensitive, clickable is fine. It will be connected to a very simple 1 or 2 digit counter. Any suggestions? PS: Eventually I'd like to upgrade this with a system that can instruct something else, for example 5 counters, display etc. Or be able to use bluetooth or wifi or arduino, and be able to count back. For example input 10 and it will count 1/10, 2/10, 3/10, etc..

Posted by tees_deney 2 years ago

FSR - Conductive foam readings

Hello! I am making a prototype of a force sensitive resistor, and i am using, to old 97%kobber coins, metal sheet and a tiny piece of conductive foam that i got from a tv-repair shop. The setup is not very good, but its a start, and i am planning the next move for better results... Now... I want some decent understanding of how the readings work, and why I get these results.. First test, are written with black, and and as you can see it, has the same amount of space between 0-1kg and 1-2kg, but 2-3 and 3-4 changes to a very small space? Why is that? Second question is, that i have used the x10, to read larger forces. 0-2,5kg and 2,5-5kg has same amount of space. Will the space decrease too, when getting further up the scale too?  - I know the conductive foam has its limits too, but just to be clear of my readings. Thanks in advance! I hope you can see the readings on the picture..!

Posted by L33boy 3 years ago

Need help to make my shirt vibrate!!!

I have a dream of having a shirt that vibrates when i hug people, i think it will be like a nice surprise when it happens. I have looked around and no body makes anything like this, none i can get at least. i have seen on here how to make little vibrating motors and thread pressure sensors but i have no clue how i would go about combining it all into a shirt. Really need someone to help me make this reality so if you think you can or know someone who can please contact me!

Posted by jaraiza8 6 years ago

des leds qui réagissent au son mais système non branché directement à la sortie du son

Bonjour tout le monde, j'aimerais de l'aide sur un projet qui me tient à coeur je suis passionné de diabolo, je pratique moi même et j'aurais aimé créer un kit lumineux à incorporer dans le diab et que les leds qui seraient dans ce kit  réagissent a une musique environnante ( une musique provenant d'une chaîne hifi par exemple ) et tout sa sans qu'il y ait de branchement qui viennet sur la chaine hifi. je voudrais que les leds régissent exactement cmome les leds dans le projet suivant: mais sans fil qui sort du système et avec de composants petits pour que le système puisse rentrer dans les calottes de mon diabolo (idéal ce serait un circuit imprime qui fasse  10cm sur 10 cm max) i vous connaissez quelque information qui pourrait m'aider a mener a bien mon projet merci répondre sur ce topic je vous en serait reconnissant merci et bonne journée

Posted by hypolite 6 years ago

Touch Sensitive Floor Mats

I have one of those Halloween floor mats that when you step on them, it triggers a sensor that has it make a screaming noise. Is there anyway to hack this? It's annoying and I want to make use out of it.

Posted by thatjawn 10 years ago

4-wire touchscreen sensitivity

Hi team I posted this on the Arduino forum, and had a search through several electronics sites; perhaps there's also someone here who can suggest something. I have successfully hooked up my touchscreen to Max via Arduino; the code is fine, the circuit is fine and the Max patch is fine. I'm just wondering if it's possible to tweak the sensitivity of the entire circuit? When touching, one must press fairly firmly, otherwise any relaxation of touch, even with continued contact, results in a rapid fall to zero. In the Max patch, I'm using [sel 0]-> outR, after all the [serial] gubbins to help smooth some jitter. But is it possible to tweak the sensitivity, perhaps by using resistor values other than 10k. Hey, maybe even connect a variable resistor to allow realtime tweaks? Hmmm. Thanks Brendan

Posted by brendanmccloskey 7 years ago

Motion Sensitive Switch

I'm trying to come up with a switch that activates when it is moved. Ultimately it would connected to a sound device and a small sample would be played every time the unit is picked up. Any suggestions on how I should go about doing this?

Posted by hectma 10 years ago

how to make a metal detector sensor for high sensitivity

Hi everyone Could you please help me... : ( how to make a metal detector sensor for high sensitivity examples of metal objects the size of 1mm the use of these sensors for metal detection in food security

Posted by RickyS18 2 years ago

Sensitive Accelerometer Chip

I've seen some projects that use accelerometer chips with arduinos to get readings (e.g. in MATLAB). I'm looking to do this but I'm going to be measuring very low amplitude, low frequency vibrations so, I imagine, the types of acceleromters I've seen used (e.g. the MMA7341L) won't be sensitive enough. Does anyone have a suggestion for which accelerometer would be appropriate (I know that MEMS are a popular brand - there's a list here:  Many thanks for your time! Oli

Posted by ocheadle 3 years ago

How to replace mini microphone with more sensitive mic?

Hi I am trying to replace mini microphone (is very similar to mobile phone microphone) of Audio bug with more sensitive Standard electret microphone with intention that it pickup sound from more than 1 metre distance, and in doing so I am getting too much noise in Audio bug out-put. Do I need pre-amp? Is there any better way to do it? If pre-amp then how to harmonise out put of pre-amp to the input of audio bug? Any help..... Thank you.

Posted by ksaus 7 years ago

heat sensitive wall outlet

Does any one have or had plans for a wall plug outlet or an extension cord from a tool that would turn off if the temperature of the devise reached a preset degree.  i.e. your coffee machine operated normally but it caused the duplex plug to overheat and the circuit would shut down avoiding a possible fire condition. 

Posted by dano9999 1 year ago

Doornob touch sensor

I took apart a stud finder to see how it worked. Did a quick google search and figured out they work similar to tough sensitive lamps (capacitance). So after soldering an on off switch to replace the push button on it, I taped it to my door, and fine tuned the sensitivity wheel. Now when someone touches the doorknob (on either side of the door), It lights ups.

Posted by boggysandman 10 years ago

In the Pipeline

I have some parts on order and will be adding two more instructables in the near future. 1. Cascading multiple squibs with adjustable delay. 2. A miniature trigger module with increased sensitivity.

Posted by Crosius 9 years ago

Tis nice to find out now.....about raw cultivated mushrooms....

I just found out that is it unwise to eat many cultivated mushrooms raw. I finished up 3 pieces of pizza I had placed some sliced Oyster mushrooms on for flavor. If I don't sign in tomorrow morning, I am in the hospital :-) it is said that only sensitive people will be effected by the toxins......nice ! :-(UPDATE: I seem not to be sensitive nor particularly vulnerable to this toxin probably because I have ingested so many raw baby portabellas from salad bars :-)

Posted by Goodhart 9 years ago

Feaure Request - moving images

When dealing with images, I cannot do the "drag to reorder" stuff on a touch-sensitive device, such as my phone or tablet*. Since the vast majority of my time online is via one of these two devices, not being able to click & drag images around is a major PITA, having to start up the desk top computer just to move a thumbnail a few pixels... Bearing in mind that most UK internet browsing is done via touch-sensitive devices, and the UK is this site's second-biggest user-base, it would seem sensible to address this issue. *both running Android

Posted by Kiteman 4 years ago

using a strain gauge to make a load sensing pedal

Guys, I want to use a strain gauge as a load cell in a driving game, where the brake padal is force sensitive not movement sensitive. Currently the pedal is set up with a rotary potentiometer which has three connections and is basically the same as a PC joystick, complete with the circuit board. The strain gauge is one of the resistive film type with two connections, and the resistance will vary with the extension of the gauge; however, I don't know how to link this to the joystick circuit hardware, as one of the connections is missing Any ideas?

Posted by lesthegringo 6 years ago

Motion sensitive, people tracking light

So I stumbled across a really neat lighting project on yanko design and I'd love to make one so I'm trying a two pronged approach: I'm emailing it's developers to ask nicely what they've done to do it, and conferring on this idea with the community here as I'd love to work on it to make more effective/ directive lighting. No need to light my whole reading room if I can make it smart. Here's a link to the project to see what I'm yammering on about:

Posted by incase 7 years ago

The use of soft circuits in robotics

Sheets of touch sensitive material seem perfect for giving robots a "skin" of sorts. This could easily allow for something along the lines of a robot pet that can tell when it is being petted. It would also be useful for robot grippers, to allow the robot to hold on without applying too much force. With a layer of durable plastic between the circuit and the cloth, the robot could be made water resistant. Not really sure where else to take this, but I think touch sensitive, water proof skin (and also whiskers) would go a long way to making better robot dogs and cats, and probably other kinds of robots.

Posted by MDude 7 years ago

Tactiontape - Touch Sensitive Tape for Rapid Prototyping

Hi everyone, Tactiontape is a one-dimensional touch sensor that curves. It's designed to make building interactive physical prototypes easier, even ones with non-planar or complex surface geometry. It functions as a flexible potentiometer and uses a strip of graphite to express a linearly resistive electrical signal, one that corresponds to how far along the tape you've touched. Each sensor is hand-made using materials from an art supply store. Here's a demo: For purchasing, photos, and more detail:

Posted by davidholmandotme 6 years ago

LEDs in resistance sensitive circuit

My question is relative to getting a LED to function correctly in a resistance sensitive circuit.  Here is the situation. 1. The Battery Warning Light in an automobile I am restoring currently uses an incandescent bulb.  2. Functionally, the light is on when the ignition is turned on, but goes off when the engine starts.  3. This works fine with the incandescent bulb, but not with a LED, even if I put the same incandescent bulb in the circuit (parallel). 4.With just the LED in the circuit, it never goes off.  This is because the circuit has about .5V leakage voltage through the device (which is a Lucas 3AW Warning Light Unit) when the engine is running (and correctly, 12V when just the ignition is on). 5. With both the LED and the incandescent in the circuit, the incandescent does not come on and the LED does not go off, both with ignition on and engine running. 6. I have also put a potentiometer in the circuit with just the LED and cranked it from 1 Ohm to 100K Ohms, with no effect. 7. Of course, an easy answer is to just use the incandescent, except that the dash is wired and complete and installed, and I prefer to get the LED to work.  Any thoughts or suggestions would be very much appreciated.

Posted by DaleR18 2 years ago

Piezo Sensor to Detect Vibration Through Glass

Hello,  I am working on a project where I need to detect vibration through glass panes or on the surface of a window. I am currently planning to use a Piezo sensor with Arduino to detect and record different tests. I want to make sure that the senor is able to pick up the vibrations and not be too sensitive and pick up other things around it. I may need to tune the sensitivity. Besides the Piezo sensor I was also looking at the Parallax 605-00004 Piezo Film sensor (any advice on which one to use is appreciated.) If there are any other sensors that anyone may know that could work in this case, please let me know. I don't have a clear vision but any help to find out how I would go about this is greatly appreciated.  Thanks for the help

Posted by surajshah1 1 year ago

picaxe sensitivitį

Hi there instructables, recently I have bought a picaxe starter kit, soldered it and stuff, played with some code and leds, but now I want to make a time control, so I bought a cheepo alarm clock, desolder the piezo beeper and extended the wires so I can conect them to my picaxe, turns out its too sensitive, the pin I've set to input piks up heat fom my fingers about a centimeter away, breath too, I think it picks up grounding as a signal too, does it ment to be that sensitive or have I messed something up with soldering or the code?  heres the code I used  main: if pinc.4 = 1 then goto led goto main led: high c.1 pause 500 low c.1 pause 100 goto main

Posted by batonas 4 years ago

sound-sensitive LED lights that respond to music, sewn into clothing

Hi there.   I'm new to the boards and off to the big festival in the desert next week.  Every year I make some kind of a flashing suit-- usually they are EL Wire -- which is kind of cool to dance in.  I recently took an Arduino course and I thought it would be great to make a jacket that reacted to sound.   Ideal:  Had a pot to deal with volume (of club music vs. speaking) and was able to power a row of LED's down each arm and possibly down the side of the torso. I have a board- I don't have time to program it- I'm wondering if anyone can help? I'm happy to sew it and all that stuff.  Yes, time is tight , but it doesn't have to be perfect! Let me know. There is some budget- not much but some. 

Posted by HUMUNCULUS 8 years ago


I am trying to use a phototransistor to detect an object passing between the diode and transistor.  The problem I am having is that the PT is always on - even without the photodiode.  Are these things that sensitive that even a florescent light will trigger it?  If so, how do you prevent it from staying on?  I have never used these things before and my electronic design is pretty limited. TIA, Les...

Posted by les dale 7 years ago

Peanut Butter Cups, Welding, R2D2 Lamps

  Peanut Butter Cups Welding R2D2 Lamp Alarm Clocks Tree Speakers Aluminum Can Craft Weight-Sensitive Backpack Floppy Disk Percussion Drain Barrels Paracord Can Koozie Make Your Twin WIFI Projects Create a 3D Layered Drawing Paracord Belt Balloon Tying Jig

Posted by randofo 8 years ago

Evolved Gardening

I love having plants indoors and I'm always interested in new ways to grow and display things. A firm called Boskke is redesigning how we approach indoor container gardening.  "BOSKKE means ‘a small forest’ and that’s exactly what you can create with our intelligent eco-sensitive designs."  Boskke - Evolved Gardening Via: Readymade newsletter

Posted by Culturespy 8 years ago

Touch Lamp Switch?

Is there such a thing as a switch that is touch sensitive so just a tap will activate it. I want to make a lamp out of an empty glass coke bottle and i want to be able to touch the cap to activate it. Im looking for a small piece of silver metal that will match the cap so i can place it on top, OR a way to make the actual cap the switch. Thanks!

Posted by um0123 9 years ago

HELP- need a design for an "automatic closing chicken door"

Need a "freelance circuit designer" the idea is a light sensitive switch which once the sun went down could close a sliding chicken door.. i'm thinkin it would just slide a release which would let the "guilitene" style door slide closed. i just need someone to build it... help

Posted by juntius 11 years ago

Awesome site selling space age materials

If you're hurting for novel materials, do I have the site for you! It's got all these super-cool, futuristic-y weird, wacky and awesome materials made possible by science.  Between the talking tape (speaks a message without electronics!), shape memory polylmer, super elastic plastic, temperature sensitive glass (SO pretty!) and the temperature sensitive color changing fabric - I can't decide what I want most! Each product's page gives applications for it, but I'm sure ya'll don't need the suggestions...most of us work in regular plain old metal, wood, leather, plastic, electronics, etc - imagine all the extra routes you could go with some of these things as components. (No, I'm not being paid or something, I'm just excited about all the possibilities...hey, what about a contest with prizes being money to spend on this site??) As Kiteman would say - Go on... Inventables

Posted by Lithium Rain 7 years ago

Adding remotecontrols to electric devices

I am looking to add a remote control to a circuit board which controls two separate motors (forward/backward and left/right) The control should be pressure sensitive. right now the control is a mounted 4 directional switch (like on a motorized wheel chair). How can I add a remote to it? I have an old R/C car board, and the remote that goes with it.

Posted by DaMadProfessor 11 years ago


When working with electronics how often do you ground yourself? In many tutorials dealing with IC's they don't ground them selves. In a lot of programming tutorials they don't mention grounding when handling the chip. Stuff like arduino, minipov, daisy, and many others where the end project is open, are those sensitive to discharge? I'm juust asking because the esd wriststraps are annoying to wear because the wire get's in the way.

Posted by guyfrom7up 10 years ago

EVP quality, tele listening amp.

Hallo friends, Please show me a schematic diagram of a highly sensative amplifier, or hearing aid that I can use as a telescopic remote spy hearing instrument. Something as sensitive as the EVP paranormal audio recorder. I tried this circuit but doesnt work :( Please guide me to a circuit that actually worked for you. see you thanks

Posted by ketan7s 8 years ago

Current measurement with arduino

Hey I try to measure current with hall-sensor amploc 25A, it sense magnetic-fields, offset voltage is 2.5V and I use arduino uno. I get 519 value from analog pin and 37mV/A is hall sensor sensitivity. My formula is outputValue = ((((sensorValue*5000.0)/1023.0)-2500)/37 multimeter shows 0.112amps when I put load but I dont gett correct value on LCD Is my formula OK?

Posted by mattilaniko 3 years ago

Need help with Led project (time sensitive)

Need help with Led project (time sensitive) Hello I am currently working on a project that has less than 3 weeks till the suspense date. One aspect of the project I will be adding some LEDS. I want these LEDs to flash. So I got the following stuff for this project: LED Flashing kit MK102 by Velleman from Fry’s Electronics 100 rectangular flat clear 2mmx5mmx7mm LEDs (DC 3V 20mA) 400 DiCUNO 3mm LED assorted colors Forward Voltage: R/Y 1.8-2.2V B/G/W 2.8-3.2V Max Current: 20mA The issue: Ok so I want to take the LED flasher kit and instead of using the two supplied red LEDs I want to run two series of LEDs. One series will have two flat clear LEDs and one clear 3mm LED. The second series would have one flat LED and one 3mm clear LED. I have other colors but I figure if I stick with the clear LEDs, it makes everything simple and I will simply paint the LEDs the color I want. I would like to use all the other circuitry that comes with the kit and simply add each series where you would normally add the two red supplied LEDs. This kit runs on a 9 volt battery. So, I am assuming that I can simply replace the supplied resistors that come with the kit with ones that account for the LEDs I want to use? I am attaching the diagram from the kit for clarity, I hope this is making sense. Any help you can offer would be appreciated.

Posted by 11b30b4 1 year ago


Tomorrow is the Science Fair at my school and I'm not finished yet. My aim is, Will Climate Change Affect The Growth Of Grass In The Next Ten Years? I've done the testing and I'm writing the conclusion. I need to know some plants that are sensitive to temperature changes. I have already searched and can't find any (I must have very bad searching skills). I also need to know what kind of chemicals that plants use. I'm kind of panicking right now!

Posted by DELETED_Gavabc123 10 years ago

Extend optical mouse range

Hi all, I'm wanting to make a jig for a production project requiring a sensitive optical measure of movement with a focal length of 5-10 mm. I thought an optical mouse might be a good start but the lenses in a few I've tried require the device to be too close. It needs to be no bigger than the electronics of a mouse. If anyone has a lens that could be perfect or other ideas I'd love to hear them. Thanks, D

Posted by Qball007 6 years ago

Pi Day Contest Vote not listed on Instrcutabe

I entered my "Pie-Eyed Pulled Pork" instructable in for the pi contest and the epilogue contest. The voting for both is going on now, but when you click on my instructable, only the voting for the epilogue contest comes up. I'd rather have the pie contest vote linked on this page. I just added it to the epilogue laser one because it was eligible. Can you fix this??  This is very time sensitive

Posted by Forkable 7 years ago

T.V.I.K.T Entry

Here is my entry, it seems to be a mix between rail and slingshot crossbow.This makes it incredibly sturdy and enables me to put the trigger lower.The staircase shaped rubberband string is there to get more power out of a smaller area.Nice and heavy weapon, destroys cardboard easily and gets a nice 175 feet range.Camera on phone seems very sensitive to movement, sorry about the slight blur.

Posted by Wicky 8 years ago

(newsletter) Toddler Guitar Hero, Homemade Pizza Recipes, Printer Shredder

Toddler Guitar Hero Controller Homemade Pizza Recipes Printer Shredder Dystopic Lamp Easy Compression Bookshelf Glass Beads from Broken Bottles Money Origami Collapsible Bed Frame Wristband Light Writer Ball Bearing Rollercoaster Handmade Rings Position Sensitive MIDI Drum Pad Birch and Aluminum Desk Waterproof Camera Case DIY Disc Golf Target

Posted by fungus amungus 8 years ago

Pin-Pressions/ Rotation Sensor

I'm trying to build a sensitive pinpression device: one that can see 3d digital images. The device would be able to read, record and organize the depth of each pin. I think the first problem to overcome is figuring out a cheap way to measure pin depth. I think it will be best to do this with rotation sensors. Does anyone know how to build or where to buy cheap rotation sensors?

Posted by yes 10 years ago

PC USB steering wheel 180 degrees 1080?

I've got a GEMBIRD STR-SHOCKFORCE-M Multi Interface steering wheel which I bought new about a month ago. It is pretty much "you get what you pay for" as far as it goes, and its not nearly as good (nor did I expect it to be) as, lets say a G27. Now, I have never used a G27 but I saw some videos, and it seems that it can do a full turn, while this one only does 90 degrees to each side - 180 in total. I'd like to modify it somehow so it can be rotated 1080 degrees like in a real car, or atleast somewhat more than 180. I found it useful in some racing games where turning needed to be quick and sharp, but in some simulation games it just jerked the ingame steering wheel like it were out of cardboard and ultimately I end up parked inside a wall or on top of a tree.(adjusting the steering wheel AND ingame sensitivity setting to lowest didn't help) If anyone needs pictures I'll post them later today.

Posted by vzupčević 3 years ago

Big Mouth Billy Bass Mod?

hey guys i just found an unused "Big Mouth Billy Bass" singing fish thing in my attic and i was just wondering if anyone has/knows how to mod it to possibly play a pre-recorded message, possibly off an mp3 player? i want to make like a security device out of it, utilizing its motion-sensitive singing i figured someone out there might know how to hack it to play something other than the horribly obnoxious music it comes programmed with. thanks in advance!

Posted by puno 7 years ago

kick out lamps with emp

Hid lamps (sodium and halide) are used for outdoor lighting they are sensitive to momentary power interruptions (even the smallest ones that dont make computers reboot) and mechanical stress (like beating the electrical pole with the lamp). they extinguish and need some minutes to cool down before they strike again i thnk it should be possible to kick out the lamps with emp (electro magntic pulse) as well. how strong pulse is needed to affect this kind of lamp ? is it possible to pack such energy in a portable device ?

Posted by 11010010110 9 years ago

Cut Plastic bottle in half, then reattach.

Heyah, So yeah....for a project i'm working on I would like to cut a plastic(coke cola) bottle in half, then put some stuff inside, reattach the 2 half's together, then fill it with a liquid.(Don't ask) My first attempt I used hot glue, but sadly the plastic is super sensitive to heat it would seem and it just simply melted the plastic so I wasn't able to seal it.  I tried to even let the glue cool down, then apply it but that didn't work either. Any ideas?

Posted by Brasou 8 years ago

Black Powder for use in fireworks

I want to get into pyrotechnics as a hobby, and i thought i would start with rocketry. So my questions are: What is the best for a lifting charge for fireworks or a rocket, very very fine particles, or coarse granules? i read somewhere on the internet that granules are best, but all over instructables it says to grind it really well. And also, would adding steel powder/magnesium powder to enhance the spark effects alter the BP? like would magnesium make it more sensitive? Please answer, Thanks.

Posted by FunkNattidelic 9 years ago