Questions tagged [short-circuit]

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

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44 views

Fault Protected RS485 circuit

I am designing a product for use in the industry and it needs to include a fault protected RS485 interface. In the industry the most normal voltage for the power supplies in the machinery is 24V, but ...
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Repair for a shorted high-speed photodetector

I was using a reverse-biased high-speed photodetector which is ESD sensitive. I took caution when operating it, wearing an ESD wrist strap, setting up the power supply for bias and the RF connections ...
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133 views

Strange Short Circuit

Can someone explain me how a 60V 5A power supply can generate that super hot arc (second circuit in the video)? I made the video, and no, there's no hack here, I'm just trying to understand what's ...
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1answer
36 views

Need help troubleshooting problem with RFID antenna

I do computer support in our public library. Lately I've run into some issues with the RFID readers we use for our check out and staff stations. I'm trying to troubleshoot the problems we're having, ...
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96 views

Short circuit testing with protection on power supply

I have a PCB that is equipped with short circuit protection inform of an inline fuse at the main 40V DC input (5x20 glass fuse) and some other components that I am not too familiar with. My aim is to &...
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31 views

What does it mean when it says to use the same energy mix in this network? Also how do capacitors affect the short circuit?

Here is the network: There is generator G1 that is modeled as a coal-fired power station and generators G2 and G2 that are modeled as a hydropower plant. It is said that if i reinforce the generation ...
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1answer
111 views

Can a battery electric vehicle be driven through a dust storm? [closed]

I would like to know if a battery electric vehicle such as a Tesla Model 3 automobile can be driven through a dust storm. Back during the Dust Bowl days of the 1930s, driving through a dust storm ...
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1answer
96 views

Would this cause a dead short?

I am attempting to install an oil pressure sensor / sender unit for an automotive application. My concern is with adding a relay to make the internally triggered NO switched contact inside the sensor ...
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1answer
48 views

Leaving the plug attached to the socket [closed]

It would be really helpful for me to leave the USB plug (the "brick") plugged into the power socket. I would not connect the cable, which could potentially short if it touched a conductor, ...
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27 views

Why does the short circuit current increase when we connect a distributed generator?

I read that the short circuit current increases when we connect a generator to the grid. Why? Is this true for any kind of generator? (PV, wind turbine, synchronous generators, etc.)
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71 views

Why AC motor driver shorts out?

I have been working in a VFD using an AC motor driver FSBB30CH60DF and making control of it using a dspic30f4011. As you can see in the attached circuit schematic, the mains supply is a single phase ...
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2answers
539 views

Preventing oscilloscope magic smoke by inverter vs isolation transformer? Good idea or not? [duplicate]

There was another question that said that an isolation transformer had to be used to prevent possible damage to an oscilloscope, and I suggested this as a solution, but never got an answer. This ...
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1answer
93 views

Oscilloscope safety, measurements for safe probe ground connection [closed]

I have several oscilloscope safety-related questions. The questions come after a bit of background information. Please let me know if you think there's something iffy with the background information. ...
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852 views

Please help me debug my circuit

I am trying to build a guitar pedal but am unfortunately failing. I have about a high school physics understanding of electronic circuits, but the readings I am getting seem impossible to me. I might ...
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1answer
50 views

Will the current able to flow or capacitor able to work in this circuit?

If the switch is closed, how does the capacitor work in this condition? I know that the main source is shorted. How about the capacitor? Will there be current flowing from the capacitor through the ...
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1answer
118 views

How to protect the common ground on a voltage divider

I have a voltage divider who looks like the following: This voltage divider is linked to an STM32MP1 Development Kit By inadvertance we made a short circuit in another place of the circuit that made ...
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1answer
102 views

Solder paste and perfboard/prototype board/donut board destroying the circuit?

Does perfboard/prototype board/donut board made of paper or something (at least it's not fiberglass, that much I know) become conductive when heated to the point of becoming black? I'm assuming these ...
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2answers
117 views

Should there ever be a dead short across where a capacitor goes in a circuit?

I have an old video card that is not working right and creating instabilities in the system it's plugged into. I measured several dead shorts across capacitors in circuit using my multimeter. After ...
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2answers
144 views

What happens when a source cannot supply enough current?

What happens if my circuit draws more current than my source is able to supply? For example, if I have a source that can supply 1 V and 1 A and I attach it to a resistor that is 0.5 ohms, the circuit ...
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3answers
273 views

Ceramic capacitors shorting on power up

I have a power supply unit that is used to drive a couple of relays. Rarely but sometimes the input capacitors (C218, C200, C201 and C207) to the switch (U202) short when the power is turned on (230V.)...
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2k views

Is it possible for an IC to become shorted internally?

Is it possible for an IC to create a short to GND internally? Perhaps applying to much heat during the soldering process it, supplying power to the wrong pins, mishandling, etc.?
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1answer
27 views

Is the impedance bus matrix method the same as the Ohmic method in power system fault analysis?

There are a few methods to do power system fault analysis, like the per-unit method, MVA method, and impedance method (Ohmic method.) I am doing fault analysis using per unit symmetrical component ...
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1answer
138 views

Mystery short in piezo driver circuit

I'm building a circuit to drive a 113 kHz piezoelectric mister. When I apply power, it appears the circuit is shorted. My regulated lab power supply hits the 1 A limit I set, though it should consume ...
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25 views

When to ignore the source contribution to short circuit?

The question: The solution I solved the problem using both MVA method and the per unit method, however, I added the source contribution as usual and get the fault 1458A. My question, when to ignore ...
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1answer
39 views

Short circuit scenario && current sources to understand short circuits

I created two circuits to understand what will happen when I create a short circuit to a current source (the I1 in the first circuit will be zero A or it will remain its value at 1 A and it will ...
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1answer
55 views

per unit method question

I just want to know why did he parallel the two apparent powers?
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Oscilloscope low side connection

I am taking an introductory circuits class where we are learning to measure resistances. I recently measured the resistance between the low-side of an oscilloscope and earth ground on a power supply ...
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3answers
116 views

Short circuit current calculation

** I DON'T WANT THE SOLUTION ** The question is: A three phase 50MVA, 4,160V generator with a reactance of 7.9% is connected to a three phase 4,160V/480V step down transformer rated for 1.5MVA with an ...
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49 views

MPU9250: VCC and GND Short but device working fine

I'm facing a vague issue with MPU9250. When I tested with Multimeter, it shows that VCC and GND are short but the device is working fine, Output perfect accelerometer and gyroscope data. My circuit is ...
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125 views

Question about computer engineering circuits (noob question) [closed]

I'm currently self learning computer engineering stuff right now and I was wondering how RAM would work in terms of input and output and I stumbled upon this image I think it's somewhat wrong from ...
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47 views

Soft-start design and performant with short-circuit test

I am working on a soft-start for a capacitive load. I using module QSB40024S24 to create 24V output. At first, I allowed the output of the module to connect directly to a capacitor array (21.4mF in ...
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48 views

Let-through current of MCB

I'm wondering what's the reason of creating the let-through current diagrams for fuses and not for MCB's. Even more curious I'm, because one of largest manufacturers is providing the let-trough ...
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2answers
331 views

How do I simulate a short/open circuit in LTSpice?

I am trying to simulate open/short conditions for testing an optoisolator circuit I'm building. Essentially, I need to simulate SHORT and OPEN in order to verify that what I'm designing will output ...
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1answer
54 views

Short circuited power supply still safe to use? [closed]

Last night I short-circuited a Samsung 5v 1A phone charger to see how much current it could deliver. With my multimeter I measured 1.2A, despite the fact it says 1A. Is it possible I have damaged my ...
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92 views

How to identify SMD component

I am trying to investigate an issue with an FPV quad that I have, on my flight controller, there is continuity between the ground and 5v pads, people tell me this means that one of the 5v regulators ...
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1answer
68 views

Capacitor on output of regulator causing short circuit

We were using switching regulator and when we turned on the regulator short was found. C285 was damaged. After removing C285 , regulator worked without any issues. We were suspecting inrush current ...
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1answer
78 views

What is the fault level of paralleled transformers? [closed]

When paralleling transformers the fault level at the bus is it the sum of the individual transformer fault level?
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1k views

Why do contactors have lower withstanding current for signaling than power circuits?

Suppose this contactor by Schneider LC1D115. I don't understand why it has a lower withstand current for signaling circuits when it can handle 10X the amount of current for power circuit on the same ...
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2answers
52 views

What happens when level translator input and output are shorted?

I am using a level translator in my design to interface between two systems. I also want an option to bypass the level translator by shorting a jumper resistor placed across terminals A and B. What ...
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81 views

AC analysis of circuit: capacitors in parallel with BJTs

It's been a while since I've done AC analysis for circuits, but the sources I've looked at say to short DC sources to GND, and to treat capacitors as shorts. Given the placement of C7, I think Q3 can ...
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Short circuit inside CPU during operation

I have received two boards from one of our customers that have the same defect. It is a short circuit between VCC and GND. I was able to trace this short circuit down to the MCU (which is a LPC1114 ...
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1answer
111 views

What do schematic symbols (R, C) marked "SHORT" mean?

What does it mean when a resistor or capacitor is marked "SHORT" instead of being given a value in a schematic? At first this seemed clear to me: it must mean a 0-ohm resistor, something I'...
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69 views

Why does Altium's autoroute short circuit polygons

Novice here. I would like autoroute to handle routing all my connections, but it seems to violate the polygons that I have placed before routing. I can't seem to find any rules that may/may not cause ...
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55 views

Can short circuiting the CCFL inverter output while plugged to an LCD panel damage it?

The TL; DR version of the question: I had an LCD panel salvaged from a broken laptop. I bought a controller board with onboard inverter and the monitor was working. I accidentally short circuited the ...
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2answers
80 views

Can an RCD do the job of an ordinary fuse?

Suppose we have a short circuit somewhere in a house. Does a residual-current device (RCD) stop the current in this situation exactly as an ordinary fuse does? or it's not reliable for this?
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275 views

Voltage and current [duplicate]

It is proven only when there is a potential difference current flows in that branch between two nodes, then how we say that the current flows in a short circuit where the voltage on that branch is 0?
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1answer
170 views

Simple short circuit protection?

Basically, I have dc adapters one of 12v 2a and one of 5v 1a, which do not have short circuit protection, having said that I want to make a simple circuit to protect them, I will add the circuit to ...
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992 views

Short in MOSFET between Gate and Drain

I try to understand a circuit, where this is a part of: To me this looks like a short between the Drain and Gate in the pmos at the top and nmos at the bottom. The line from the top pmos to the right ...
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226 views

VCC to ground confusion

I recently reached out for help about uploading Arduino code to a pcb I designed for an LED watch. It was pointed out that I had a couple of errors in my circuit design: “First, R9 should be a pullup ...
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2answers
255 views

Reading potentiometer with external ADC

I am a newbie and my first post. So please excuse my ignorance in advance. My project is to create a handheld readout to read potentiometer(s) (10K linear precision pot) with minimum 10000 steps ...

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