Questions tagged [short-circuit]

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

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1answer
109 views

what is the reason of a Short Circuit? [duplicate]

I am new to electronics, and I don't understand the theory of a Short Circuit. Why does a Short Circuit happen?
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3answers
46 views

24v AC common/ground

I'm trying to understand what I believe to be a basic/fundamental theory, however, I seem to be over analyzing. On many hvac units the 24v or 120v control transformer common is grounded to the unit ...
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1answer
70 views

Handcuffs as protection?

I am not familiar with electronics at all, but as I was strolling through the stack exchange network I've noticed how it is dangerous to electrocute oneself by touching a wire with one hand and ...
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3answers
46 views

Why is my fan circuit with SSRs short circuiting on power down?

I am attempting to build a "smart" ceiling fan for a home automation system I have created and added to over the years. However, this is the first time I've tried controlling a fan motor ...
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36 views

Starved thermal on GND or starved thermal on power

These errors can make me a short circuit in my PCB which consists of 4 layers (top, power, GND, bottom.)
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1answer
43 views

Short circuit of solenoid's windings

I wanted to short a solenoid, so I just touched the wire of two adjacent loops at a point somewhere in between of solenoid, but now I wanted to know what changes occur in its inductance and ...
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1answer
53 views

Shorting the Output of a voltage regulator

I am using this Buck Converter Input Voltage Range - 8-16V Output Voltage - 5V Load Current - 550mA This 5V is the power supply (Vcc) to the mentioned IC loads : Microcontroller , LED Driver , 2x CAN ...
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1answer
56 views

How to modify TL431 current limiter to work with 80V bus?

I referred following circuit from TL431 datasheet TL431 max voltage at cathode is 36V. since circuit has only a transistor , how to modify this circuit to work with 80V at input(Vi bat). output ...
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3answers
6k views

What is the use of this diode in the circuit?

What is the use of this diode in the circuit? I guess it is used for short circuit protection and turning off the LM2576.
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1answer
60 views

SPDT mechanical relay: do NO and NC pins short between each other as pole switches

I have a mechanical SPDT relay (Digi-Key PN 281-6348-ND, I am only using one of the two channels). I also have a sensitive circuit downstream of the relay. (Image source) While a mechanical relay is ...
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1answer
49 views

Bridging transistors

Title might seems confusing but I want to connect two seperate transistors' outputs - bridging them. Main question: Would there be a short circut if I connect +V(voltage from another transistor ...
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1answer
76 views

A quetion about how an electric shock game works

can someone explain to me why does the current pass through his hands? why doesn't it pass only through the aluminum since electricity always chooses the easiest path? https://www.youtube.com/watch?v=...
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1answer
42 views

Finding the voltage and current at t = 0 using Step Response

The question that I'm trying to solve is as follows: In the circuit shown below, the switch has been closed for a long time. a) What is v(0) or the voltage across the capacitor immediately after the ...
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23 views

ESP32 CAM gpio0 permanently grounded. how to fix?

I bought an ESP32 CAM and flashed it, I connected the UART with example code on the board but always got this: ...
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2answers
64 views

Why did this triac driver resistor let the magic smoke out?

I hope the title is acceptable under this website rules but it is exactly what happened. I wired up this circuit that I thought I tested in the past multiple times, but I might have wired up slightly ...
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2answers
34 views

Short circuits and equivalent resistances: why does the subcircuit get cut off?

The circuit is the following: simulate this circuit – Schematic created using CircuitLab What is the equivalent resistance seen across Nodes 1 and 2? I am told it is R4 + R5. That means ...
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1answer
98 views

BGA VCC and VSS shorted after desoldering

I am really confused with working with BGA chips. I am new to this but have been following other guides so I thought I should give it a try. I am using a DIY pre heater that has a 800watt IR bottom ...
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1answer
40 views

Arduino Mega 2560 USB died due to short circuit

I have found some Arduino tutorials where the voltage regulator died on board: https://www.instructables.com/id/Fix-a-fried-Arduino-Mega/ However this is not the case for my Arduino Mega 2560. The ...
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9answers
8k views

Why doesn't this capacitor short this circuit? [closed]

I'm doing a super simple Arduino led project. I followed a tutorial online that wired up the LEDs like this: I'm wondering why this capacitor doesn't just short the power supply. Can anyone ...
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1answer
50 views

Part number of a connector in an Asus laptop

While trying to repair a laptop, the connector linking the power button to the motherboard of a Asus x54h has burnt. I am a software developer, I do not have very much knowledge in electronics, but ...
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2answers
73 views

4 - 20 ma current loop, Short circuit isolator

I am trying to design a short circuit isolator, for 4 - 20 ma current loop based intruder alarm system.The below system,identify short circuit in sensing line and sensor activation(closing 1 k in line)...
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5answers
1k views

What does it take to short a battery

I understand that low resistance through a circuit will create a short circuit but what combination of voltage and amps which causes this? For example, if I had a circuit with just a wire and a ...
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1answer
66 views

How can there be a zero sequence current in a single line to ground fault with an ungrounded neutral

The circuit that describes a single line to ground fault in a system with an ungrounded neutral is: I neglect capacitance between phases and only look at capacitance to ground. The definition of zero ...
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1answer
30 views

SCC for Synchronous Generator Using Matlab

What should I put in ''Three-Phase Programmable Voltage Source'' block ?
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70 views

Open circuit test and short circuit test

The results I got are close to the required answer, but there is a question asking for drawing the open circuit and short circuit tests characteristics .. I tried to solve it, but Isc and Vt (in open ...
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1answer
30 views

Thermal protection effectiveness against short circuit

I'm using the L6201PS H-bridge to drive a 48V DC motor and I broke one of the H-bdridges (when I drive it in the forward direction now, both OUT1 and OUT2 are 48V instead of OUT1 at 48V and OUT2 at ...
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3answers
54 views

Short between GND of Arduino and AC powered circuit

Upper left corner is a simple AC powered circuit that can supply 15mA of DC current. Lower left is an Arduino connected via USB to desktop computer. The meter shows a voltage of 1.58V between the ...
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2answers
126 views

Why is my set up short circuiting?

Disclaimer: I'm a noob. I have the following schematic (updated as per @Transistor): I had first tried this out on my breadboard. It worked fine. From what I read online, this was two capacitors set ...
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1answer
99 views

This Potentiometer Keeps Catching Fire And I Can't Locate The Short

Device: KADA 852 Hotair rework station (not 852D) VR9 keeps catching on fire and R42 is half toasted but still keeping its resistance, I removed and checked CA12 and CA13 and they are not shorted. ...
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1answer
64 views

Meaning of “A voltage source “likes” an open-circuit load”

I read a book "The Art of Electronics" by Paul Horowitz, Winfield Hill. In the book, I saw some phases. A voltage source “likes” an open-circuit load and “hates” a short-circuit load A current ...
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2answers
249 views

Why can one pour water on a car battery's terminals (12 Vdc) and not have shorting

When cleaning a standard 12 Vdc car battery's terminals, it's a common practice to pour a mixture of baking soda + hot water all over the terminals. The water can spread and effectively short out the ...
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1answer
46 views

Do I have to protect the CD4013 outputs from short circuits?

I'm trying to determine whether a CD4013BE ("CMOS Dual D-Type Flip Flop") can take damange if one of the outputs (Q or Q-bar) is set to high, but shortened to ground (or vice versa) with no resistor ...
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2answers
89 views

Headset microphone is noisy, but touching speaker wires removes the noise

I'm repairing my simple wired headset which is composed of two little speakers and one microphone. The audio and mic jacks are separate. The speakers work fine. But the microphone is very noisy. As I ...
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2answers
63 views

Shorting issue with STM32F446; PCB or schematic design

I'm working on designing a PCBA which uses the STM32F446 as the micro. The issue I'm dealing with is that something seems to be shorted between 3.3V and GND, likely due to some fault with my schematic....
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1answer
79 views

Idea behind Thevenin equivalent circuit

As i know, we find a thevenin equivalent resistance by finding open-circuit voltage and short-circuit current and then divide these two. I have looked on wikipedia and other sources but could not find ...
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1answer
62 views

How to short circuit with using push button

I am testing the ability to charge and recharge battery circuit. I have been testing using a push button in order to short circuit the battery and drain the charge. I would like to instead use an ...
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2answers
99 views

What is the peak of the short circuit current

I have this problem: Consider the circuit below: \$V_{in}\$ has an amplitude of 17V and a frequency of 125 kHz. What is the peak of the short circuit current between the terminals \$a\$ and \$b\$? ...
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1answer
32 views

LDO maximum output current during short circuit

I am using this IC - LIN Mini system basis chip - TJA1128 Using the LDO in that IC to generate 3.3V with 50mA of load current. I see that the maximum output current capability of the IC is 85mA. ...
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1answer
49 views

BTS441RG Chip Failure When Reverse Powered

I have this circuit that takes in two 24V power supplies and combines them via two BTS441 ProFETs. It then feeds either input A or B to a BTS6163 ProFET which provides protection and monitoring to a ...
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2answers
60 views

Water's ability to short an L18650 cell?

Personally I no longer use 18650 cells, I use polymer packs with safety circuits. However having once or twice in the past I have briefly shorted a connection between the positive terminal and the ...
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1answer
73 views

Is a short circutied battery (I believe) worth anything? [closed]

While trying to install 2 Duracell Ultra 12V 46Ah AGM batteries to power a trolling motor in a boat, I accidentally connected my wrench from the positive of one battery to the negative of the other. ...
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1answer
68 views

Maximum Allowed Time for Short Circuit

Is there a maximum amount of time a circuit or system is allowed to have a short circuit present? I'm asking this because I'm thinking about how fuses and Over-current IC's perform. There is a set ...
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0answers
31 views

Consequences of misalignment connection that grounded power supplies

Having the following mezzanine expansion connector and the related +VSYS_IN part of the schematic What would be the consequences of a misaligned connection that shorted both +5V and +VSYS_IN to GND ...
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1answer
85 views

Where to start repairing a faulty electronic board? [closed]

I am working on electronic card repair of textile machines. When a faulty electronic card arrives, I visually check it first. Is there a burned or cracked componenet next to it, if any, I am replacing ...
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1answer
65 views

Requirements for closed, open, and short circuits

In terms of understanding paths in a circuit, let's take a few example circuits: (1) Would the following circuit be considered closed or open (or something else) since it doesn't have a voltage ...
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2answers
110 views

Meaning of “short circuit current” in datasheets

This a general question regarding what should we understand when we see the term "short circuit current" in a given device datasheet. Does it always exactly mean the output current when we short the ...
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1answer
47 views

Which XT60 on battery?

What is the recommended plug on the battery? The male or the female XT60 and why? XT60 connector
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48 views

How the capacitor charges in this circuit?

I have been working on a kind of edge detector, and I would like to be guided about how the capacitor will charge in this circuit. when I don't have any transistor I could easily calculate the ...
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1answer
60 views

Where to fuse high voltage batteries connected in series?

I have modules of cells in series each with 48V. I wonder where is the right place to fuse the modules in series. (The current to trip the fuse is the same on every point). Version 1: simulate ...
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1answer
44 views

Understanding CFLs in Electrical Circuits

I wish to have a better understanding of how CFLs work in a electrical circuit like a home. A CFL broke a little towards the top when I touched it. I noticed it light up at the bottom and then made ...

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