The short-circuit tag has no wiki summary.
10
votes
5answers
927 views
How many hairy crazy ants does it take to short out an electrical system?
I read an interesting article about an invasive ant species the other day and was amazed by the following paragraph:
The ants can bite, but the biggest danger is that they're attracted to circuit ...
9
votes
2answers
332 views
Why exactly 470 or 1k Ω? (to prevent damage of output pin)
Quote from the Arduino tutorial, section Digital Pins:
Short circuits on Arduino pins, or attempting to run high current
devices from them, can damage or destroy the output transistors in the
...
6
votes
3answers
286 views
Could smoke allow arcs to form?
I've been trying to find the cause of power supply failures, and noticed that an NTC is smoking if it runs at full power. Obviously the NTC needs changing. But is it possible that the smoke in the ...
6
votes
4answers
165 views
Detect “real” overcurrent/short-circuits vs. current peaks
We have a MOSFET that drives a load. The load has a sense resistor in its current path and its voltage is used to trigger a circuit that can disconnect the load if we detect an over current ...
5
votes
3answers
381 views
Can I burn components / short circuit by using a multimeter
It's probably not new to you, but sometimes we want to analyze a powered circuit with a multimeter. I love to do that, but I'm a little worried that I might burn some components or the whole circuit.
...
5
votes
3answers
218 views
What can cause a Drain-Source short in a FET?
Background:
I am using a Si7456CDP N-channel MOSFET in a switching power supply. The power supply and load are housed in a plastic enclosure. Yesterday, the power supply and load were working ...
5
votes
2answers
380 views
Limiting the short circuit current of a power supply
I'm using a repurposed ATX power supply for my hobby projects since it's got 3.3/±5/±12 outputs, all of which are really convenient. But one thing I didn't really think about until I slipped my probes ...
5
votes
3answers
2k views
Voltage and Current Limiting Circuit
I'm a newbie to circuit design, so I think I'm either really lost or over thinking this (most likely the former). I need a circuit that will act like a current limiting power supply, which I can ...
5
votes
2answers
89 views
Dry cleaning and Electronics?
I'm thinking of embedding a circuit into a jacket that I have, and I was wondering whether I could dry clean it with the circuit still attached to it. I read that dry cleaning could potentially ...
4
votes
5answers
411 views
What is a short circuit at the electron level?
I'm trying to understand when you can say a circuit is being "shorted".
Obviously you are creating a short circuit when you hook up the two ends of a battery with a wire. But the wire does offer some ...
4
votes
2answers
555 views
Why do rechargeable batteries have no short-curcuit protection?
Whenever I read a user manual to a device that runs off a rechargeable battery - like a cell phone or a power driver - the manual will always say I should store and handle the battery in such way that ...
4
votes
2answers
2k views
How to do a simple overcurrent protection/circuit breaker circuit for 12V 1-2A?
We're developing an I/O shield for Arduino (sort of) and having four FET controlled output connectors with approximated 12V 1-2A load each. I need all these four outputs to be short-circuit protected ...
4
votes
1answer
191 views
How is pouring water addressed in high-voltage electric transport systems?
An electric train is typically powered with something like 1,5 kilovolts of direct current of something like 25 kilovolts of alternating current. In my experience electric device manufacturers charge ...
4
votes
3answers
128 views
Why does grounding my switch cause the fuse to blow?
I'm working on restoring an old ATV, and I'm having a bit of trouble with the wiring. When I got the ATV it was missing the ignition switch, so I decided to replace it with this awesome looking ...
4
votes
2answers
2k views
How can I disassemble an iPhone 4 battery without damaging it?
I would like to measure the power consumption of an iPhone 4 using a source/measurement unit.
On other devices I am able to connect the SMU directly to the +/- battery terminals, using tape to ...
3
votes
2answers
174 views
Is the energy loss in a voltage drop equal to heat/mechanical work/light emitted?
I am wondering if the energy loss in a voltage drop over an entire circuit is equal to the energy transferred from the circuit (e.g. light/sound/mechanical energy/heat).
If this is true, wouldn't ...
3
votes
3answers
152 views
Building a power supply, want to stay alive
I am building a power supply for a very old laptop. The circuit uses a transformer (220 V primary to 15 V secondary, 33 VA) and that worries me a little. (Please note that I an enthusiast and so far I ...
3
votes
2answers
635 views
arduino's pin number 7, isn't it dangerous without resistor?
I am reading a book called Getting started with Arduino. In that book, I don't understand why there is no resistor between pin number 7 and the switch (see diagram:)
If there is no resistor ...
3
votes
1answer
113 views
What happens when you set a pin in the wrong direction?
All MCU's have digital pins, which you can configure to function as input or output.
When you set something to 'output' which is wired as an 'input', will there be any possibilities of short-circuits ...
3
votes
1answer
275 views
Shortcircuit protection with PNP
R1 became RS
R2 bacame R
1)Is this a correct shortcircuit protection?
2)What is the max current that can flow before the transistor enters in saturation?
3
votes
2answers
197 views
When is a short not really a short?
I'm debugging a PCB which has a AT Mega 128L and two CPLDs mounted on it. The microcontroller actually works OK but I'm unable to program it via JTAG (and I don't have ISP or any other headers on the ...
3
votes
1answer
65 views
Redesigning TV Remote for a different User Interface
The buttons of a standard TV remote are simply conductors covered by insulators (for user protection) to be pressed in order to short circuit a node in a grid of wires.
What if we want to replace ...
3
votes
2answers
233 views
Short circuit test on long coaxial cables
In a building infrastructure there is coaxial cables for TV. The first end of all the cables is on the roof. The second end for each cable is in different apartment.
The problem is that I don't know ...
2
votes
3answers
182 views
Bus Contention - Output Pin driving another Output Pin
I've run into an unusual problem. I'll start off by describing my goal: I'm designing a circuit that can test for short circuits and open circuits in a wiring harness. The wiring harness does not have ...
2
votes
3answers
449 views
Can a device be damaged by water even if there is no power supplied?
For example, say I submerged a computer mouse entirely. Assuming that I ensured that all traces of the water were gone, would the device suffer any issues?
It is my understanding currently that ...
2
votes
1answer
129 views
Short circuit protection on a charging line
I have a device that runs off SLA batteries that needs to be charged in a dirty environment. There is a possibility that the circuit may be shorted by accident during the charging cycle (this is ...
1
vote
3answers
347 views
How can I have a rising edge close a relay for a fixed time?
I have a problem that I don't know what the solution is called, but I would bet that there are many solution.
Problem: I have to short-circuit two pins on a mainboard (power switch) when a rising ...
1
vote
2answers
166 views
What kinds of short circuit detection circuits are possible?
I'm trying to make a kid-proof breadboard, and for this I'd like to add some kind of system that would first warn that a short circuit is imminent, and then blow a fuse or similar if the warning is ...
1
vote
2answers
130 views
Automatically Change Open to Short
We have a field device that is connected to the secondary winding of a transformer. The device is replaceable, but when it is disconnected, the open circuit can cause problems elsewhere on our ...
1
vote
2answers
1k views
Short circuit protecting a class AB amplifier
I am designing a little class AB amplifier for a small circuit. This circuit is biased such that it has low crossover distortion. Below is a schematic:
As you can see, I have inserted 68 ohm ...
1
vote
4answers
450 views
Circuit short circuit capacitor question confusion
I am really unsure about how to go about this question and which circuits to consider.
Here's the question:
Determine the value of the current labeled \$i\$ and the voltage labeled \$v\$ at ...
1
vote
2answers
104 views
How to measure a short of power amplifier in car?
Recently my old amplifier in car has got a defective contact on one of the switches, so I decided to unsolder the old one and solder a new one. Unfortunately the amplifier caused a short as I ...
1
vote
2answers
1k views
Power supply short circuit protection
This circuit looks relatively simple to build. I'm not going to bother with the transformer since I have a dc adapter. I was wondering how would I adapt this circuit to use a lm317 instead of a ...
1
vote
2answers
284 views
Short circuit protection in simple audio current amplifier
In my class, we are to design a current amplifier with short circuit protection.
In our design, we utilized 2 emitter follower amplifiers (Q3, and Q1).
We then added Q4 and Q7 to lighten the current ...
0
votes
3answers
118 views
Will a short circuit in analog A/V cables cause electrical damage to connected equipment?
Most people don't take especially good care of analog A/V cables, and they are often subjected to getting stepped on repeatedly, chewed by pets, etc.
If an analog A/V cable (component, composite, ...
0
votes
1answer
103 views
Shorting two pins using a headphone jack
I've managed to "build" a shutter release for my Canon SLR by shorting two wires connected to the appropriate pins on the Canon connector. I am looking for ways to extend this into an intervalometer ...
0
votes
2answers
263 views
Can Opening a Switch Cause a Short Circuit?
Is it possible to construct a simple circuit (sans transistors) that would cause a short circuit between two points when a switch is opened? My intuition says no, but I don't have any proof for such a ...
-1
votes
2answers
97 views
Lithium batteries worries [closed]
For the last few days I have had this strange fear that an external short circuit would cause an explosive fire of my laptop's Li-ion battery.
Three questions:
Is it true that lithium ion ...
-2
votes
2answers
137 views
Is an unexposed but peeled cord safe? [closed]
So after having my iPhone for a long time, my charging cable has gotten frayed:
The rubber insulation of the cord has peeled off and the foil cross talk thing rubbed off. The cord still syncs and ...
-5
votes
1answer
184 views
How to turn off an electrical installation with a simple cheated plug? [closed]
Theoretically, would it be possible to do a short circuit with a cheated plug? How can cheat it?
Added:
Wikipedia on "cheater plug"
A cheater plug, AC ground lifter or three-prong/two-prong ...
