Shorting Capacitors? Answered

Hi Guys, Recently I found a person selling a power supply for $3 and I thought why not to buy it and salvage the components. I was wondering will it be safe to short the huge capacitors in the power supply? Thanks :)

Question by The Prickly Potato 4 years ago  |  last reply 4 years ago


Making Sparks!?! I need to create a short circuit.

Well I need to take a very small DC current and up the voltage some so that I can create a spark. I'm pretty clueless here, so can anyone help? If more details are needed I could provide some, but it's for a project that will very likely become my first instructable. Best answer will get a mention in my instructable if I do get around to making it.

Question by shyguy567 10 years ago  |  last reply 4 years ago


Why don't AC adapters fry?

I tore open an AC adapter to find out what I was doing wrong in my own power supply attempts. Before any other components, and connected directly to the outlet prongs, was a transformer. I know that it drops voltage and (by ohm's law) the amperage as well. But how does its survive the process? Why doesn't it have huge amounts of waste heat the way a current limiting resistor does? Why doesn't the primary coil of the transformer--effectively a tiny wire short circuiting an AC outlet--burn up? I'm certain this has something to do with the impedance of an inductor, but I just can't figure out what!

Topic by TheCorsairMalack 3 years ago  |  last reply 3 years ago


help with shorting probem on my curcuit

This circuit does not work because of a problem with power shorting to ground at the motor. I think that is the only problem. The servo provides a 4.5v power source and the polarity can switch allowing the original 4.5v servo motor to run forward and reverse. I am making this to run a motor on 12v and the servo on 4.5v. R1 keeps the transistor saturated and the R2 is in there because I read it would help the transistor turn off completely. I made this circuit work (the right voltages went to the right places) in one direction but now it is more complex, I think I’m having a shorting problems. Can anyone help?

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


How to connect computer power supply in series or in parallel? Answered

I have about 5 computer power supplies and i want to connect 3 of them in series but they short circuit each other how do I remove the short circuit protection?

Question by theVader75 7 years ago  |  last reply 6 years ago


Micro sstc trouble Answered

I am trying to build the micro sstc by steve ward. My circuit  behaves like there is a short somewhere, but I checked  all the connections. The mosfet isn't connected yet and the 555 timer is getting hot, any ideeas?

Question by theVader75 4 years ago  |  last reply 2 years ago


Remove short-circuit protection from a psu.

Hi, i'm new here and i have a little problem. I want to make a soldering iron because mine is broken. I have a ATX PSU, but when i short circuit the 12v(16a) output the PSU shutdown. I want to remove the short-circuit protection  from my psu, how i do ? I'm begginer in the electronics, so please help me step by step. BTW, Sorry for my crappy english, i'm just a romanian guy :P

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


Is there an easy way to find a short or open circuit in a car?

I am trying to find a open or short circuit that is on a wire which is in a harness with other wires, on a 1986 Mazda B2000 truck. With so many of you having expertise in electronics, I thought here would be a good place to post my question. Does anyone have any suggestions how to find this open or short-circuit?I am open to the idea of getting a short-circuit-finder. Though I am not sure what features I should look for if I decide to get one. Does anyone have any suggestions?a) Does anyone know if these work well?b) What features should I look for If I get one?c) Do you have any other on a short circuit finder? type, manufacturer, model etcBelow is a link to a site that uses a short circuit finder to find a short circuit, and has information on using one: http://inliners.org/tech/tech6.htmlBelow is a link to a site that tells about how a tone generator is used to find a short circuit, in a home environment (I think this is how most short circuit finders work): http://askville.amazon.com/tone-gene...uestId=5912724I found some links that seem to show that it is possible to make a signal generator and tracer, but the pages with the schematics would not load. A list of tools with links to tools and their schematicshttp://www.qsl.net/kc4gzx/kc4gzx/project20.htmCircuit tracer (neither of these would not load 4-3-09 kept getting message "the Connection was reset."):should have schematic:http://circuitos.tripod.cl/schem/r111.gifand the signal generator:http://circuitos.tripod.cl/schem/r25.gifA little paranoid voice thinks this Instructable has some clues to the solution: How to prevent thefts steal your motorcycle for less than US$ 2 Thank-you in advance,

Topic by Jonque 9 years ago  |  last reply 3 years ago


Heating element in hair dryer still ON

Hello, I have the hair dryer which have 2 switch one for the blower and other one for heating, when turn the blower ON the heating coil that connected to the rectifier terminal is work ON and the motor work in slow and high (not perfect working) . There is no short in out circuit . Sorry for mu english thanks

Topic by MahdiA19 3 years ago  |  last reply 3 years ago


Breadboard Circuit for a servo?

I am looking for someone that can tell me what to do on a basic electronic breadboard (what timer, resistors etc) to be able to create a circuit to drive a servo. Basically i am an over ambitious art student that wants to use a a servo on a timer to alternate between 0 and 90 every 5 seconds or so (i haven't decided what time i want it to be but figured i could adjust it?) I am learning about these things on a DIY basis but as i am short for time i want to get it sorted. Any help would be appreciated.

Topic by GF88 9 years ago


Arduino bootloading circuit

Hi everyone, I have a short question. I am making a project that uses a ATmega328P and I'd like it to be stand alone, so I have been burning bootloders on this chip but only on the DIP socket and with a shield I made after a tutorial. I know that when burning the ISP you can't have anything connected to the board, and I was wondering if you must have the same conditions for the bootloading procedure since I am going to use the TQFP32 package and it is going to be a little bit difficult to make a shield for it. So if I solder everything to the board and put a connector for the ISP do you think it will burn the bootloader?

Topic by shinystuff 4 years ago


Circuit Design Help

Trying to build a simple circuit to power a small pump while the sun is out. Here are the specifics: Solar Panel (60 cell mono panel) Open circuit voltage 36.4V DC, Short circuit current 7.96A. Pump 12 V DC, 9A max Using E=IR ,  R=E/I, (36.4-12)/7.96 =  3 ohms Power = V(sq)/R = 24.4/3 =198 watts  I purchased a resistor that meets these requirements and hooked everything in series. (Solar panel lead to resistor, resistor to pump, and pump to other solar panel lead. The pump does not turn on when the panel is in the sunlight. I measure the voltage coming out of the panel and it is within specification. I also tested the pump by hooking it up to a car battery and it works fine. Any ideas what I am doing wrong? thanks!

Topic by OMGIMDUMB 3 years ago  |  last reply 3 years ago


Why is my 12v battery pack is short circuiting?

So. I made a simple circuit. 12v volt battery pack>on/off switch>two 12v led strips. The strips ran fine for hours, but when I turn the switch off, the battery pack short circuits. What is it I'm doing wrong/ not doing?

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


How to preset current regulation & short circuit protection ?

Found this awesome diyr Linear power supply design with voltage & current controlling- Foe more details--http://electronics-diy.com/power-supply-lm317-2n3055-0-28v-6-8a.php 1>Since it has no short circuit protection apart from the fuse,then how to preset current just like bench power supply by shorting the the leads ? 2>Without short circuit protection will the  2 two 2N3055 blow up ? 3>Please assist that what should be done for the modification.

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


Fading LED Circuit

GOAL- My goal is to light up a small model I have using an LED circuit that will automatically fade in and out. DESCRIPTION - I will be using 19 blue LEDs (3-3.2V fwd voltage, 20mA fwd current) and would like them to fade in and out on their own very slowly. I am thinking that this will be powered using a phone charger or other household transformer since batteries don't seem to be a feasible option for this (too many batteries clustered together and/or too short a life span). I have a transformer on hand that runs 5 volts at up to 850mA, so if that works then perfect, if not then I could try to find another transformer. For the sake of simplicity I could add one more LED to make it an even 20, though I would have to drill another hole in my model. TASK - I need the circuit to make these LEDs do their fading. Simple as that. Fading circuits are easy to find on the internet, but I have been having trouble finding anything to meet my project criteria. Any help with this would be immensely appreciated!

Topic by Andrew Wiggin 5 years ago


Basic circuit not working? Answered

Hey Guys, Today I made one of the simplest circuit I have ever made, its literally two motors in parallel with a switch. The problem is it didn't work :( (embarrassing). I don't know what I did wrong. When i flip the switch the motors just spins for 1 microcentimetre then stops. I even attached an led to the terminals of the motor it just blinks once then turns off till i flip the switch again. Anyway wiring and demonstration is in the pictures, videos provided. Here are somethings to note: 1. The motors were working perfectly before i made the circuit. 2. The battery (may) be half used. 3. The glue used to attach them to the base (styrofoam) is hot glue, so I had to be verryyyy careful to not melt itithe base). 4. I cant take it apart since its attached to the base and the base will break and using glue with styrofoam wasnt easy so I dont want to do it again. 5. I have tried even by moving the motors a bit away so that they dont touch, still doesnt work. 6. If I leave it on for say a minute the battery gets slightly warm to the touch. 7. I cant find any short in the circuit.

Question by SA-DIY 3 years ago  |  last reply 3 years ago


why are my 18650 cells shorting? Answered

After realizing lead acid batteries are sooo 1859, I decided to construct a battery pack out of 18650 cells. I soldered 4 in series on the top half of the cells. When I went to do the bottom half I found that touching the wire from one negative terminal of one cell to the positive of another cell it short circuited. At first I thought I had a bad cell so I checked all of them and they were all fine. I desoldered them and tried putting only 2 in series, same thing. The cells still put out ~3.7 so I don't see the problem. please help. 

Question by fossilshark 3 years ago  |  last reply 3 years ago


If you spill liquid onto a live conductive thread circuit, will it short out? Answered

Will liquid exposure ruin a live conductive textile circuit? How about if it's powered-down? Can you wash (gently, by hand) a garment with a conductive textile circuit in it? What happens if you're wearing one and you get caught out in the rain?

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


How do I build a circuit that emits a loud beep along with a bright flash?

I want to build a circuit that at the press of a button will emit a loud short beep (1khz would be good) and at exactly the same time a bulb would make a quick bright flash ( a camera flash would be ideal). I want to use this device to help me  synchronise my video camera picture with sound recorded on another device. In effect this circuit is a clapper board! Can anyone point me in the right direction, what components would I need? Many thanks.

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


I need help with short circuit detector / electronic fuse. Answered

So I'm making a variable power supply with an LM317 and I've decided to add a short circuit protection, I know the LM317 has an auto shutdown feature but I thought this would be a nice feature and it would allow me to leanr more about circuits. The short detector is quite simple, It's a PNP transstor connected to the output. When the output is shorted the LM317 can't supply enough current and the load sucks everything it can, so it sucks the charge of the capacitor, causing the PNP transistor to activate and turn on the relay and the LED. This connects the PNP to ground, making it be permanently oopen until the circuit gets reset. It works flawlessly from 16 to ~9 volts, but I go under ~9v (I don't know why) the PNP activates and the relay flickers very fast, I tried several things but none fixed the problem. I have plenty of PNP nad NPN transistors so if you can come with a better and more stable design I would be able to try it, I'll be all the afternoon trying if I can figure this out and posting some updates. Here's a video of how I want it to work. https://www.youtube.com/watch?v=1nVzUUYPm3w& Look at the image for more information. Thanks in advance.

Question by Victor805 4 years ago  |  last reply 4 years ago


Help with LED circuit board

Hi all it seems i put my question in the wrong place. so keep it short this time. I have some diagrams from web for LED circuit board.  http://www.plosone.org/article/info:doi%2F10.1371%2Fjournal.pone.0002146 http://www.ncbi.nlm.nih.gov/pubmed/19772530 http://www.stanford.edu/group/blocklab/GutierrezAJP2010.pdf However I need a better power supply than 9v at 1amp and 8v for this project to work out cheap and from mains rather than batteries. any advice would be greatly appreciated. H

Question by hooman123 6 years ago  |  last reply 6 years ago



The circuit using mc3479 is getting short when i connect the terminal of the coil to my circuit but motor still runs.

The circuit continually gets short circuited the minute I connect the stepper motor terminals to my driving circuit which incorporates a MC3479 chip. The motor however runs smoothly, however my power supply keeps indicating a short circuit preventing me from adequately controlling the stepper motor.

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


grounding + 24vdc ?

Can someone explain the following, I got 24 VDC power supply (or take 1.5V AA battery) which is connected to 110VAC outlet on the input, potential difference out of the power supply is 24VDC node (+) to node (-) and potential difference of either one to ground is 0V (outlet ground). Now I take wire and ground (+) of the 24 VDC to outlet ground. Questions: 1. Why i am still measuring 24 VDC across (+) and (-) nodes ? If ground (call it whatever common) is 0 v and ground is touching (+) which was prior to shorting it to ground raised in potential by 24 V in relation to (-) that means (-) is zero potential? Or is it + 24VDC and - 24VDC but than potential difference is 48V at the output of the power supply. 2. Does that mean that I raised the potential of the ground to 24V? Probably not Thanks

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


Connection of VERY short nichrome wire? Answered

I have a VERY short piece of 32 gauge nichrome wire that I want to connect to 2 copper wires. When testing, I have connected them like on the picture, using tweezers and a pair of pliers. But I really need to find a more professional and durable way of doing it. It's important to keep as much as "free" nichrome wire as possible in the middle. I don't want to waste all the length inside a butt crimp, or wrapped around the copper wire. Is there a tiny, minitature terminal somewhere, that only steals 1-2 mm of the nichrome wire? Or am I wishing for something impossible?

Question by karolina81 2 years ago  |  last reply 2 years ago


DVD player: Burned circuit repair

My old-ish dvd player (with surround amp) suddenly broke as I turned it on. The speakers began to hum, and as I immediately switched it off, a column of smoke actually rose from underneath it's hood, stinking off fried component... I've opened the player/amp, and immediately located 2 user-accessible fuses that are definitely bust. However, something elsewhere must have broken/shorted, thus causing these fuses to blow (obviously). Is it possible to locate the source of the problems, and perhaps replace the components? I was hoping to find some unmistakable signs of fire, or some exploded caps. Some components do seem to be fried, but how can I be sure I've found the damaged ones? Also, from my intermediate engineer's point of view, my diagnosis is that someone has, at some time, spilled something into the player (note the pools of goo highlighted in the photos attached to this post), which may have shorted out some components. If anyone has some tips to help me along, it would be great! Please have a look at the photo :) - JK

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


Fixing a old tv that shorts out?

So i have this old Magnavox projection tv, hasent been run in a long time due to a shorting issue between a heatsink and something (its been so long that i dont even remember) I can plug it in and find excatly where its shorting but i dont want to fry the tv... I do remember that it is one of the heatsinks by the flyback that it arced from. I also have the basic wiring diagram for the tv, but it only shows how to adjust the picture, what connects to what and, what wire is what. Should i try and turn it on again and find where its shorting and possably fix it, or just call some tv repair guy who knows more of what hes doing.

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


HOW TO BUILD A SIMPLE WALKIE TALKIE FOR SHORT DISTANCE?

The operating frequency will be 49Mhz. what are the required components?

Question by 9 years ago  |  last reply 7 months ago


IR receiver and output over short distance

  I want to set up a short distant IR sensor(<1"). I just want it to register when something is between the two items. Its a pretty simple circuit I just have no experience with optical receivers. Any help would be greatly appreciated, thanks  

Topic by stino66 7 years ago  |  last reply 7 years ago


18650 at 0V and open-circuit? Answered

Something odd happened today. I went to use my Skyray king flashlight, but the output was very dim. I pulled the batteries out, 3 were at 2.7V, and one of them was completely dead. IDK how they discharged as I charged them not too long ago. They have protection PCBs in them so that is the first thing I suspected that tripped in the dead one. Sticking that one on the charger did not reset the protection PCB. So I pulled the insulation of the dead battery, However it is the battery itself has failed high impedance / open circuit. Even bypassing the protection PCB, I still only measure 0.001ish volt measured across it (the real measurement varies a large amount) and only uA of current short circuit. I applied 4-40V to it and measured no current flowing into the cell. Certainly open-circuit. I just thought this was peculiar, what is going on with this cell? I figured if it discharges all the way the internal resistance will go up a little, but to the point of becoming a complete open circuit!!! It is possible that a internal bond broke?

Question by -max- 3 years ago  |  last reply 3 years ago


How does one make a reverse photocell?

How can you use a photocell to make a circuit whose resistance is proportional to incident light? I'm looking for an open circuit in the dark and a short circuit in lighted conditions.

Question by EEWolverine 5 years ago  |  last reply 4 years ago


Im looking for a simple circuit that shorts an mp3 players play button briefly

For a Halloween project, barking dog head need a circuit that when powers on "presses play" (will solder wires onto play button switch just needs to be a short pulse to get the unit to play the circuit will need to be triggered by a 6v dc motor starting...and can use the same power as the motor to power itself... pretty straightforward  motor comes on - powers circuit - circuit shorts play button for a quick pulse - mp3 player plays sound clip - people jump and scream thanks in advance

Question by Pyro667 7 years ago  |  last reply 7 years ago


does anyone have the short circuits 3 book from jaycar?

I tried to get it today but it was out of stock, and i just need instructions for the simple FM microphone. the only thing i need to know is how to wind the coil. i should be able to work out the rest. so it'd be great if someone could just photocopy the page or just describe the size and number of turns for the coil. thanks

Question by Detective Inspector Me 6 years ago  |  last reply 6 years ago


1.5vdc to 200vdc without camera circuits?

I need to charge my rail gun , i always short out the transformer on camera circuits so im done with them , Ive seen "voltage triplers" around and was wondering if that would work if the input is dc? Also does anyone have any other idea, i don't wanna kill myself and use 120vac so that's out of the question.

Question by tom10122 7 years ago  |  last reply 7 years ago


My LED circuit suddenly stopped working. Can anyone help?

I set up this really awesome simple circuit for the Chitauri scepter I'm making (so the stone will glow without a visible on/off switch, which will be hidden inside a piece of the scepter), and of course, the instant I tried to install it, it stopped working.  I thought perhaps it shorted out because the resin for the stone didn't set properly, but now I'm not sure.   It's set up like this (going from the power source to the LED, and back). Power source: 9V ON/OFF toggle I pillaged from the battery pack 330 Ohm resistor Blue LED from Radio Shack (max voltage 3.8V) Back to Power source. I've checked everything, and used multiple batteries to double-check.  I even entirely re-did the circuit to make sure that cleaning off the uncured resin didn't mess with anything, and it's still dead in the water.  What did I do wrong?

Question by KateM28 3 years ago  |  last reply 3 years ago


How to isolate a battery pack from a controlled short?

so i am trying to make a portable electric stove and am trying to isolate the heat coil from the battery pack itself i know there is a way of doing this however for the life of me i cant remember how it works or what it is called. any help would be greatly appreciated! [edit] so there was some confusion on what i am trying to accomplish. i keep burning up batteries (when i say burning up i pretty much mean just that.) they don't like being connected to circuit that's sole purpose is to short out (albeit in a controlled way.) i wanted to isolate the batteries from the part of the circuit that is shorting to create the heat. if that still doesn't make sense or you think my problem might be something else entirely, please let me know. also so you know what my circuit looks like. it is a battery box power supply soldered to my heat element as well as a variable resistor to allow me to change heat output. hopefully that helps clarify.

Question by siege10 8 years ago  |  last reply 8 years ago


Circuit not working, transistor heating up?

Hey guys, I made this circuit (diagram attached) but it isn't working. There is no output voltage and the transistor is heating up like crazy. Some differences in my circuit: 1- I got my transformer from an LED bulb and not a camera. 2-I'm feeding it 3v for testing. 3-The NPN transistor I used is 2N3904. 4-Im using 2 100 ohm resistors in series instead of one 220 ohm. 5-I didnt attach a potentiometer, 6-I couldnt find a capacitor like that so I used a polyster 400v 473J capacitor. 7-My diode is not a schottkey one but a 1N4007 diode. I double checked al my connections and there are no shorts.

Question by SA-DIY 3 years ago  |  last reply 3 years ago


Motion sensor to motor circuit setup

Hi I'm trying to work out what I would need in terms of components and possibley wiring to produce a circuit of which will allow a motor to start for a short period of time once a motion sensor has been triggered then turn off automatically. It is basically to track whether or not something has exited a large box rather than its entry, this is so that on exit of the box the motor will change the the internal environment but not be triggered by entry, only on an additional exit. I am confortable with the mechanical side of this project however I am a novice to electronics and any help you could offer on the subject would be fantastic. If you need more information please feel free to ask. I could insert a quick sketch if this would help.

Topic by shauno22 7 years ago  |  last reply 7 years ago


How do I know if I've shorted my video card? Answered

So I have two 8600 GT's in SLI, and lately I've noticed that the second one was running a bit hot. So I reapplied the thermal paste with some AC5 I have lying around. However, I accidentally got some on/around some of the extremely small circuitry next to the GPU processor. I cleaned it off the best I could with rubbing alcohol, and everything seems to work fine, except I've been noticing some artifacts in my games that weren't there before. I'm wondering if I might have caused a short circuit by bridging some connections with the thermal paste, which would then cause the artifacts. It is the conductive kind after all :(. So is this a plausible conclusion, or would a short circuit have already fried my card? Any other ideas as to what's causing the artifacts?

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


3V Hobby Motor in a 6V Circuit.

Hi. Hope I'm posting appropriately. If not, please forgive an older guy! I'm working on a Useless Box project that I power from a 6V wall wart. I've already completed one and it works great. I use two standard servos with an Uno. But now, rather than being satisfied, I'd like to add a 3V hobby motor, which naturally would only run randomly for short periods of time. I have purchased an AMS1117 step down module which is rated at 800mA from Amazon to get the correct voltage for my little motor. My question is, do I need to add a capacitor across the leads or to the casing. If so, how do I determine what size? And while I'm asking, is there anything else I need to think about? I appreciate any help as this is a new hobby for me.

Topic by Steve_Lane63 1 year ago  |  last reply 1 year ago



Nichrome wire rope cutter

I've recently started working on a nichrome wire rope cutter. I've built a prototype that uses 2 9V batteries that connect in parallel to a 2" piece of 24 AWG nichrome wire. It works, but burns through the batteries within a minute of running them before they don't output enough current to heat up the wire.  I would like to improve this by turning it into something that is much less likely to burn itself down, or electrocute me in the process. I've been looking into ac to dc converters so I don't burn (almost literately) through 9V batteries. I'm kind of a bit hung up on the electrical engineering portion of this however. If I were to use something like a 12V 5A power supply, and then nearly short it with the nichrome (a resistance of .2477 OHMs) is the adapter limited to 5A, or would something start to melt. I have a feeling I need another resistor in there to reduce the current (if I but a larger PS), and or a potentiometer to dial in the temperature.  Any help would be appreciated.

Topic by halolord01 3 years ago  |  last reply 3 years ago


Can somebody show me a circuit to charge a 16volt 10,000uf Capacitor bank in a relatively short time?

Hi, i have a bank of 16V 10,000uf capacitors that im using to make a battery tab welder.  The problem i have is charging them.  Can somebody show a capacitor charger circuit that can charge these caps in a reletively short time....  60 seconds at the most.  I tried using a camera circuit but the thing to 30 minutes and 37 seconds to charge the capacitors...... i counted....  please help me.  Thank-You.

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


Can flipping a circuit breaker causes a laptop to fry?

My friend is blaming me for frying his laptop because i supposedly flipped the circuit breaker... I know from a basic knowledge of electronics and electricity that when you turn the breaker off and then back on, you just cut the electricity and it is restored...so this shouldn't cause any problems for electronics... but is it possible that the power block for the laptop can't handle the sudden off and on of the current, and then short, sending more current to the laptop, causing it to "fry"?

Question by Mighty Mackinac 10 years ago  |  last reply 10 years ago


3 colour portable LED Light Box wiring - Please Help Newbie Answered

I am building a portable LED Lightbox with a few rows of LEDs amounting to about 400 different coloured LEDs (red, green, white). Each row will be connected parallel as I want to use normal batteries to power it and not have too many wires. Ideally it should use AAA batteries and 1 switch to switch it on. Each row will consist of 15 - 30 lights each. Each row will be the same colour (eg. 1 row red, 1 row green, 1 row white). My question is:1 (1) Should I connect all the lights together and hook it up to the same battery pack? OR (2) I should connect just the lights on each row together and wire all the positive of each row to the battery pack. Will it cause a short circuit since there will be many wires to just 1 battery pack. (3) I have tried and each LED can be powered by a 3V battery, but is 3V enough to power 400 LEDs in parallel? (4) If it is not enough, I could power a few rows together meaning I will have a few battery holders, but can all the battery holders be joined to just 1 switch or I need many switches as well? Thanks!!

Question by stella_7277 9 years ago  |  last reply 9 years ago


Electronic Disabler?

Is there something that exists that can wirelessly short-circuit electronics? I haven't found anything on Google. I'm pretty sure i read something about a guy making something called an F-Ray that did this, but that was in Tesla's lifetime I think. In short I want to build something that can over-voltage or short circuit electronic devices/machines. I don't care if it ruins them or temporarily disables them.

Topic by Jordo 10 years ago  |  last reply 8 years ago


can electrolytic capacitors catastrophically fail or explode if they are shorted out? Answered

My father (an electrical engineer) told me that if a capacitor is charged and than shorted out than it can fail, possibly with explosive results. However I have seen way to many Youtube videos of capacitor banks being shorted and nothing but a big spark happening. Who is right? Can anybody help me?

Question by junits15 10 years ago  |  last reply 2 years ago


does a short circuit occur when we give a power supply to a rechargeble battery when the battery is connected to a motor

Actually i'm connecting a dynamo/generator to a rechargeble battery and at the same time the battery is connected to a motor.Does any shortcircuit occur

Question by pvamsi 5 years ago


when i had made a usb powered fan if i short-circuit it what will happen anyone? Answered

Is it going to harm my pc

Question by paritoshbk 6 years ago  |  last reply 4 years ago


555 Car Flasher unit circuit

Hi, I'm wanting to put some led indicators in my car because they are so efficient but my current flasher unit isn't designed to run such a low load.  It is also relay based which probably isn't the most efficient way of doing things and with it being an old mini it sometimes rattles itself at whatever rate it feels like flashing at at the time so I wanted to use a transistor instead. I've come up with the circuit attached and built it but when it is running all the indicator lights for the hazzards, the transistor gets hot! Surely there is a better way of doing it? Could someone have a look and see what could be changed? I don't know much about transistors but I know that I'd be better getting it to 'saturate' and act as a low resistance switch but I don't know how to achieve that.  It also has to run under two loads, indicators and hazzards, and has to flash at the same rate for each - between 1hz and 2hz. http://www.dprg.org/tutorials/2005-11a/index.html I think a variation of this circuit might be better (it makes use of the discharge pin rather than the output pin), with the load at the ground side of the transistor because it has to be an output pin on the flasher unit. I've got some BFY51, BUY82, BD743B so it would be great to use one of them. in short: what's the best solid state fixed rate 12v flasher driver using a 555 that can supply around 2 amps using as few parts as possible? Thanks for your time, and sorry if I've done anything wrong!

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