Negative Instructables?

For some reason, my profile says I have -2 instructables. What's the deal?

Topic by Argool 10 years ago  |  last reply 10 years ago


Negative Ionizer

Hello. I want to make a negative ionizer. Someone could give me a circuit that you know works? Greetings and thank you all! This is a very bad google translation.

Topic by erdosain9 7 years ago  |  last reply 7 years ago


Negative posts!

More negatives. Here I caught a screenshot of a negative post number. Reminds me of future posts dilema. Maybe when you get rid of them one place, they move. Ha ha.

Topic by gimmelotsarobots 10 years ago  |  last reply 10 years ago


Negative Google

There are ways and means of putting websites high on the results of a google search.Are there ways of dropping it down the list of a particular search, though? I am thinking particularly of the S-word - if one googles for a phrase that contains the S-word, this site comes out as third hit.So, is there a way to make Instructables less popular for that particular search?

Topic by Kiteman 11 years ago  |  last reply 11 years ago


Negative comment time

Greetings; just caught this on my inbox...negative  comment time?  It's counting up towards zero as time progresses.  Nothing abnormal about the destination post...

Topic by frollard 7 years ago  |  last reply 7 years ago


Negative Ion Generator

Hello everyonei have a Question.How can i apply a negative Ion Generator/Charger on me without hurting myself too much?? the Voltage would be too much i assume.

Question by Atlasx111 2 months ago  |  last reply 2 months ago


Negative Ion Generators

I've been reading up on negative ion generators, and I was going to get one (they're only 12.95), but I was skeptical on safety. 15kv (!) going through my body does NOT sound safe. Yeah, it's probably low current, but 15kv...is alot. How is it on pain? Could it...kill me? I don't know about you, but I only have one life, and its goin good right now, so I don't really want to get rid of it.Does anyone have experience ith these? Yes, I know about the one instructable about rigging it with your doorbell,, but even they mentioned -and I quote- "...a pretty nasty shock...", so what exactly am I dealing with? ...be specific...be specific...Oh, and I was thinking of the 12vdc one. Also, will it jump (the spark), to ANY grounded metal thing?

Topic by John Smith 11 years ago  |  last reply 6 years ago


What is the square root of -2? Answered

 I need to prove my math teacher wrong

Question by bendog38 9 years ago  |  last reply 9 years ago


Nondescriptive title...

...so as not to cause a ruckus with the very ppl I'm about to bash. ;DNggggh... I guess this is more just to vent than anything, but honestly! Can't people do a simple search and figure out why pro accounts have been instituted? It's fine to not agree, if you feel like leaving, okay then, but my stars! They start ranting and raving and just generally displaying a ridiculous amount of anger (and then calling the ones who *are* pro bad things...). I mean, I can understand strong reactions, I wasn't precisely as happy as a clam about it when the announcement came, far from it, but at least I had the excuse of not having a couple months worth of discussion, replies and explanations from the staff and owners to look at. >breathes<Anyone else getting sick of seeing all the disgruntled people stomping around yelling about their rights to have everything, for free, forever? :( I'm so tired of typing the same replies to the same complaints and questions...

Topic by Lithium Rain 9 years ago  |  last reply 9 years ago


homemade negative ion bracelet Answered

Is there a way to make a homemade negative ion bracelet on the cheap not like a ton of $$$$$$$$$$$$$$$$$ thanks for the help 

Question by sonic broom 5 years ago  |  last reply 5 years ago


What's the difference between ground and negative in a schematic? Answered

I want to get started with electronics, however I'm getting really confused schematics, specifically this one. Am I supposed to connect ground to the negative pole of my battery, or is the negative pole not used?

Question by pquadros 6 years ago  |  last reply 6 years ago


Should all grounds go to the same negative bus on a breadboard? Answered

Whenever I see circuit diagrams they just show a ground off some components. When I'm designing on a breadboard should all of these go to the same negative bus on my breadboard in order to function properly? I've got one positive and one negative on each side (standard 6" Radio Shack model). Also, I would assume that a series circuit would be for those instances when you have no negative bus at all and need to ground back into the power supply as well? Thanks!

Question by giantjamsandwich 8 years ago  |  last reply 8 years ago


How can I eliminate the electric potential difference between my power supply's negative and ground?

Hello everyone! The question is pretty straight forward, I have my fair share with electronics, so I'm not really new. I have a linear power supply in my shop and only now it has started bothering me that there is like 35V between my psu's negative and ground. I would normally not care, but since I've gotten into audio and video I found it to be problematic, because every time I connect my psu's negative to my lets say source audios' negative, 4 amps start to flow from my amp to ground trough the thin audio cable I use. I know it's not my source's fault because it's switching psu's negative is shorted to ground.

Question by R4MP4G3RXD 2 years ago  |  last reply 2 years ago


pos neg power supply Answered

I see many pos neg power supply's with an op-amp on the neg side. What is the purpose and function that is has there? There is two links with examples. First has an LM301 and the second has an OP27EP.    

Question by WWC 7 years ago  |  last reply 7 years ago


"You cannot prove a negative"

It's commonly held that negative statements cannot be proven. The absence of something cannot be proven, and absence of evidence is not proof of absence.For example, some people claim that NASA did not land men on the moon. NASA can offer proof that they did, which may be disputed, but it cannot be proven that they did not.However, the statement "You cannot prove a negative" is also negative, and if it holds true it cannot be proven either.Point: Taking this position doesn't amount to very much.L

Topic by lemonie 11 years ago  |  last reply 11 years ago


Which is positive, negative and ground? Answered

 i cant figure out which prong is which just by looking and i dont have an expertise in electronics, so if you guys could help that would be wonderful, heres a pic 

Question by gantyman 8 years ago  |  last reply 8 years ago


Whats a Troll?

I keep seeing the word Troll in reference to something to do with negative posts. At one time a bunch of people were calling me a troll because of a couple posts I put up here for entertainment. What classifies as a Troll? and why a troll? why not some other name?

Topic by chaoscampbell 11 years ago  |  last reply 11 years ago


Why are "ground" and "(-)" often referred to as the same thing.

Ok, so, I am very confused with wire colors, ground and (+) and (-). I NEEd someone to answer me. What I have read is that electricity flows from (-) to (+). However red wire is always connected to (+) and referred to as the "hot or "live" wire, and (-) is the ground. This seems backwards to me. Ground wires go to ground because it is highly positively charged, It just seems like there is contradictions. I really need this cleared up. Thanks in advance!

Topic by Ampix0 6 years ago  |  last reply 6 years ago


how to convert negative pulse to positive

Hello.. I built a transistor scr to turn on leds in my car from my remote.. my remote uses negative pulses to turn on and off... now the problem is that the scr needs a positive pulse to turn on but it uses negative to turn off,, so turning it off isn't a problem.. Im pretty sure I can just use a transistor to do this.. here is the schematic I used to build the scr...http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P2.html#Latch  ... fig 75b... is there a way to modify this circuit to make the turn-on negative or just a way to use another transistor to make my negative pulse positive? I could easily use an automotive relay to do this but im trying to make this as small as possible and its still on the breadboard.. I want to get this figured out before I put it on pcb.. thanks for your help

Topic by aclark32 5 years ago


Do speakers have a Positive + and a Negative - like LEDs? Answered

I'm planning on hooking up a small speaker out of a cheap toy to a 3.5 mm Mono jack that will go into my mp3 player but I don't know if it matters which wires go where. Do speakers have a Positive + and Negative - like LEDs? If they do, how would I find it out? Thanks

Question by 9 years ago  |  last reply 9 years ago



lm3914... how do i get it so that it lights ld1 at 10.0v and ld10 at 10.5v?

How do i wire a lm3914 so that led1 lights when signal is 10v led 2 when sig is 10.05v and 3 when 10.1.... until 10.5v

Question by 12V 9 years ago  |  last reply 9 years ago


I have a postive wire and a negative wire separate. How do I make one end postive and negative?

I am building a LED music box. HELP

Question by lkarney 6 years ago  |  last reply 6 years ago


do I need to isolate a negative ion generator?

I am looking to build a negative ion generator based spark gap... I need to limit dielectric loss, and need to use 8" of small gauge wire to and from the switch to turn it on. do I need to isolate the switch electronically from the rest of the circuit? if so, would a reed relay do the trick? if I use a reed relay, could I run it from the same power source, in parallel, or do I need to isolate power sources as well? my setup will be slightly similar to the Electrifried shoe diagram below. (no, that's not the project)

Topic by gschoppe 10 years ago  |  last reply 10 years ago


Negative posting times again in Q+A, and shifting post times

When sorted by recent, the top couple of posts in the Questions section have started showing negative post times again (and not chancing to hours after 60 minutes). As of 6PM UK time, the top two questions are showing information like this: "Asked in Technology by miamimac  -293 minutes ago    Answers: 1" This problem has appeared a couple of times before, all while running chrome on win7, and the issue persists after refreshing the page. EDIT: after looking for a bit longer, new questions are getting added to the list after the ones with a negative posting time. ADDITIONAL: recently, post times have been jumping around, causing posts to be re-ordered and Questions posted recently (with correct posting times) to be moved up, often ending up with negative posting times. Are all users seeing the same posting times, or are the faults dependent on area?

Topic by The Skinnerz 6 years ago  |  last reply 6 years ago


Which wire is positive?

I have an electret mic that I want to use, but it has green and a black wires on it, would green be positive? Or would black be?

Question by Zem 9 years ago  |  last reply 9 years ago


Photographs from negatives on my computer

I have a scanner and I am trying to scan negative pictures and turn them into photographs.What is the best way to make them look good???

Topic by funlovin420 11 years ago  |  last reply 11 years ago


on a battery holder, which lead is negative?

Question by Lacurazz 10 years ago  |  last reply 9 years ago


Is the copper on electric wire negative or positive?

On elecric wire there are two kinds of metal. One is copper and the other is iron. Okay, now on a battery there is the positive side (+) and the negative side (-). Wich wire goes where?

Question by Potaterchip 10 years ago  |  last reply 9 years ago


How to transform pozitive signal into negative? Answered

This may be not clear but let me explain. If you got postive signal(a power, coming from battery, but its positive = + ) and you want to make it negative ( like coming from negative of battery, = - ) how you can do it. Some kind of tranzistor? I wanted to use it in LPT port. i getting signal from pin 1(its +) and i want to change it to negative. Please use picture as example(it's paint drawed, sorry). picture(mirror 1) (mirror 2)

Question by dava_2 8 years ago  |  last reply 8 years ago


convert negative pulse into positive using a transistor?

Hello... ive built an scr using transistors to turn on leds in my car with my remote.. my remote uses negative pulse.. now the scr(latching transistor) that ive built turns on with a positive pulse and off with negative.. so turning it off is not a problem.. I need to change the negative turn on pulse to positive to turn it on though. I know theres a simple way using a transistor to do this, but im still learning and my knowledge of transistors is still limited.. here is the schematic I used.. figure 75 b. I followed the schematic and it works just fine..http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P2.html#Latch  ... thanks for helping me out here

Question by aclark32 5 years ago  |  last reply 5 years ago



Is there any way to convert film negatives to digital images without a special scanner? Answered

I do quite a bit of black and white photography, but have fairly limited access to a darkroom and limited funds for photo paper. I know certain scanners can scan slides and negatives, but I don't have one. I also know that many photo-processing services will give you a CD when you bring them film to develop, but A) will they convert negatives that have already been developed and B) who does the best job?

Question by Mother Natures Son 9 years ago  |  last reply 6 years ago


Spark gap ions? Help Please? Answered

Hi! I was wondering what kind of ions are emitted from a spark gap when in use? I have seen alot about negative ions and positive ions, but could someone shed some light on this? Also, how harmful are these ions to the body and what exactly are they made of? THANK YOU ANY sources that help explain this will also be appreciated! Again, THANK YOU

Question by transistorguy 8 years ago  |  last reply 8 years ago


Comparator Inputs ?

On the two inputs of a standard comparator op amp (say for example  LM741)  they usually  connect resistors from both the positive and negative voltage rails .Why do they do this and how does this work . This has been on my mind for a really long time . Could someone give me a really detailed explanation maybe with images if possible , cause this would be really helpful in the building of my next project .Most of the tutorial videos out there , i don't understand either. Thank you in advance  

Question by Strontium 4 years ago  |  last reply 4 years ago


Do negative ion generators eliminate smell?

Would a design like this work to eliminate odors in a small room? Whole thing is enclosed in a pvc pipe with 1 end open and one with small holes. The ac power goes into a switch that goes to the negative ion gen. in the sealed end of the pipe. The 9v battery goes to a switch, then to a small blower fan that blows the air out of the pipe.

Question by LiquidLightning 8 years ago  |  last reply 6 years ago


Do capacitors have positive and negative terminals?

What are electrolytic capacitors? In what way they are different from normal capacitors? The charge on a capacitor depends on how i connect it to battery,but electrolytic capacitors have one long and short terminal to differentiate between positive and negative terminal. Why?

Question by deepakmurali 7 years ago  |  last reply 7 years ago


Some help with circuit... Ground and negative pole...? Answered

Hello, just a small help. Please look on a scheme. I wonder what should I do with ground. I just leave these wires conected to nothing? And where is here a negative pole? It's not nessesary? This is VU meter.

Question by dava_2 9 years ago  |  last reply 9 years ago


Help modifier negative ion detector circuit? Answered

Dear all Please help me to modify this circuit for use only led (meter is removed) Thank you so much.                                     lam

Question by lam 4 years ago  |  last reply 4 years ago


A Third Math Sign - not just positive or negative

I was thinking about a random thing the other week. We have positive and negative signs in widespread and ubiquitous use in mathematics. What if we had a third sign? The number line would look like the one in the picture. It's not even a line anymore. Since I am absolutely dumbfounded as to how even the basic operations would play out in this type of system (although I have a rough idea for addition and subtraction), and nor do I know what the possible applications for a redundant sign could be, I'm just putting this here. Got ideas? Fire away.

Topic by nutsandbolts_64 4 years ago  |  last reply 4 years ago


Why do teenagers get such a negative stereotypical view? Answered

Why do some people have such stereotypical views of teenagers? Yes I am 15, and a teenager, but that doesn't mean I'm going to automatically shoplift from your store, use illegal substances, or somehow break the law. I've had door security rummage through my bags, cashiers watch me while I browse, and staff asking me to turn out my pockets inside out.  I work at a shop myself, so I know how important security is, I am kind and courteous to other people, I don't smoke, drink or do drugs, I hang around probably the nicest kids you'll find at my school, and I try to avoid abbreviations like 'LOL' as much as possible, yet that all means nothing, just because of my age.  I will admit that there is a small minority of teenagers who do use illegal substances and get in trouble with the law, but this gets projected onto all teenagers via the media.  And TV shows such as 'Skins and 'Misfits' just add to the negative stereotype. Right, my venting is over, feel free to add any comments :)

Question by asasklfjklasfkljasklfjaklfsjkl 8 years ago  |  last reply 8 years ago


Battery Wiring?

I have new Li-ion batteries for my mac but i wasn't completely sure on how to wire it up to the old circuitry. I know that "vg" is the ground and the "vp" is the positive. I am assuming "vl" goes to the wire "vl" i dont know what that is thought.  But there is a "vh" spot on the new battery but on the old circuitry there was no wire going to there? Do I solder that wire there? There is also two very thin wires labeled ntc, i can not find a spot on the old circuitry for that is it necessary?

Question by Aaamazzara 7 years ago  |  last reply 7 years ago


What are the &quot;ground&quot; on a electronic circuit? Answered

I have checked many schematics and on all of them I see GND (ground) and nothing going to the VSS of the power supply. Is GND mean that it's connected to the negative (VSS) or is it more complex than that? What I am supposed to do if a schematic have both negative and grounding? Thank you.

Question by sxdemon 9 years ago  |  last reply 9 years ago


Wiring up a filter copasitor?

For my Cold Fusion Project I was told to use a filter copacitor with the isolating transformer and the bridge rectifier.  I have had some trouble understanding this.  The mains AC runs through the isolating transformer and right after that I need to hook up the filter copacitior.  How do I know which is positive and negative.  I know AC alternates between + and - but when I need to hook it up to the rectifier I need to find + and -.  How do I do that?

Question by Kalrag 8 years ago  |  last reply 8 years ago


How do you print black and white negatives?

Chemicals needed and times for printing black and white prints from a negative?

Question by tim guinan 9 years ago  |  last reply 9 years ago


how to tell the diff between pos or neg on led

Question by stevebb99 10 years ago  |  last reply 10 years ago


How to get -12V (Negative than 0V) in car?

Question by satsat 4 years ago  |  last reply 4 years ago


what different ozonator,ozone generator and ion negative? Answered

 Dear All.. Please help me to know : what different between  ozonator,ozone generator and ion negative.( how much idea voltage for use in home) Thank you in advance.

Question by lam 7 years ago  |  last reply 7 years ago


How do I use a negative voltage regulator?

I have some 7905C voltage regulators, and I'm wondering if I can use them the same way I would use a 7805 voltage regulator except on the opposite side of the circuit.

Question by misterpicture 7 years ago  |  last reply 7 years ago


Which side of the arduino protoshield is positive/negative on this area?

I am just starting out with Arduino and I have been working on assembling the Protoshield. I am about to install the green LED shown in this picture from Make.com but I don't know which way the LED should be orientated because it didn't say in the guide and I couldn't figure it out on the board. If you could please say that 1= positive and 2= negative it would help me out alot. Thanks!

Question by alexh934 10 years ago  |  last reply 10 years ago