# Tagged Questions

An impedance that is non-zero during normal operation becoming very low

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### Do engineers use the term “shortage” for a short? [on hold]

Someone criticized another for using the term "shortage." In all my life I have heard of electrical shorts, a "short" meaning "short-circuit." But I never heard this called a shortAGE. Is ...
63 views

### What determines what type of short-circuit current is highest?

I'm doing a short-circuit analysis of a system, and started wondering about the following: What determines which type of fault current is the highest (and lowest)? The screenshot below shows the ...
179 views

### Voltage across short circuit

We know that current is passed through a circuit if there is a potential difference between the two terminals of the conductor. But in the case of a short circuit, we say that there is no potential ...
74 views

### Is a charred resistor open or short?

I've a problem where I should expect how a circuit will behave with a charred resistor. So should I consider this resistor a connecting wire or an open switch?
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### Tripping Power supply but no short circuit

I'm having a bit of a hard time diagnosing a problem with a circuit I have just soldered onto stripboard, the circuit works perfect in simulation. The scenario is that I have a circuit with a few ...
44 views

### Voltage-following, short-circuit protected PSU circuit

For a PSU regulator circuit with these requirements: 0-14v adjustable output, set by 0-14v signal, accurate to +/- ~200mV 20A current limiting +/- ~2A which reduces output V as necessary down to 0V ...
121 views

### What is Kirchhoff's voltage law all about?

what is the Kirchhoff voltage law ? isnt it the sum of potential drops as we move along a circuit till the same point should be zero it is simply energy conservation law that when the battery ...
121 views

### How to protect a signal from output short circuit?

I have made a signal generator based on DDS and amplified its output to 0-20 V pk-pk. Now I want to prepare the output side. My main concern is short circuit protection to prevent damage to my device. ...
114 views

### Can I Use TIP42 as Q1?

The Circuit Below is a "Short Circuit Protection", and Circuit Detail is : Voltage Regulator: LM2576 Maxixmum Load Current (i): 3A Output Voltage: 5,12 and 15 Volts The Original Circuit is Low ...
265 views

### Will the short circuit damage electronic components or just the supply?

This I have thought about. We know that shorting the supply creates zero resistance path between the vdd and gnd. We also know that current will pass through the least resistance path and since there ...
193 views

### How do I safely connect a 74HC00 series circuit to microcontroller?

I built and simulated a circuit out of 74HC00 series ICs and want to connect it to a microcontroller (ATmega 16). The development board I use (Atmel STK500) supplies 4.93 V (GND to VTG and GND to ...
103 views

### How can I isolate a short (in a mobile phone in this case)

I have a Nokia 6030 cell phone, and it's been serving me 7 years. It developed an interesting problem, which looks like a short of some kind: the battery drains very fast, for an hour or so, and the ...
222 views

### Accidentaly shorted Arduino Leonardo VIN pin to GROUND. Is my board fried for ever?

I accidentaly shorted the Vin pin to the Leonardo's GND pin and the ON led flashed. After the flash, the L led turned on with the ON led and stayed that way. Then the AtMega32u4 started to heat up ...
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### How to protect PC (ports) when connected camera may suffer vandalism?

Background I have a USB webcam installed above my door that acts like a video intercom for my countryside house, but I'm worried somebody may try to cut the wires, disable it and damage the computer ...
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### How can I identify the fault on an Arduino Uno board that's had the smoke let out?

I recently purchased an Arduino Uno. I've been having a ton of fun fiddling with it -- that is until I pushed +12V to the Vin without any kind of voltage step-down. The smoke was violently released ...
284 views

### 2 color LED short circuit my board

I have a 2-color LED (3 pin out: one common, and one for each color). I have a DC motor running on two AA batteries. Both color LEDs are OK while testing on a battery pack. Now what I need is the ...
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### Choosing Fuses or MCB in 24VDC vehicle circuit

I am currently designing a 24VDC circuit for a small vehicle. I personally prefer using MCB's since they are simple to reset and easy to detect faults in the system, although i do find it rather hard ...
113 views

### What problems can arise from temporarily shorting power supply of a small microcontroller circuit?

A friend purchased a microcontroller-controlled lighting device and in the process of testing it, shorted the VCC and GND together for a second or two. Coincidental or not, the device stopped working ...
227 views

### Understanding short circuits (in Arduino) and identifying electronic devices

I'm a programmer and I recently purchased an Arduino Uno and I've very scared to short circuit it. I've been playing with http://www.falstad.com/circuit/ and have been able to create a few LED ...
52 views

### Faulted phase detection

Currently I am studying about short circuit detection on long lines and I can't solve one task: I have line between two substations, and there is short circuit some where on this line. I know current ...
87 views

### short circuit with two power supplies

I have a radio controlled power switch (one that you plug in between the wall and a lamp to switch it on and off with a remote), that has an atmel microcontroller on it. I connected the radio switch ...
322 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 ...
479 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 ...
551 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 ...
771 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. ...
200 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 ...
218 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, ...
80 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 ...
1k 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 ...
130 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 ...
229 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 ...
605 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 ...
658 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?
198 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 ...
136 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 ...
112 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 ...
113 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 ...
778 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 ...
4k 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 ...
193 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 ...
139 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 ...
560 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 ...
129 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 ...
4k 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 ...
876 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 ...
260 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 ...
362 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 ...
704 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 ...