Questions tagged [short-circuit]

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

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Assembled PCB not working. Any ideas? (round 2)

Attached are schematics and an image of a circuit I made for a project. I asked this question months ago with an earlier iteration of the circuit and finally got around to assembling it on a single, ...
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DC power supply exceeding current limit without load [closed]

I am attempting to create an induction heater for soldering purposes. The build involves a 24V/20A power supply, two 12 volt fans in parallel, a time delay relay and a ZVS board. I have fried multiple ...
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Short circuit broke a P-channel MOSFET [closed]

I have an electronic board and I inadvertently made a solder bridge while soldering my circuit. This solder bridge is represented in blue on the picture below. After that the P-channel MOSFET ...
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Norton's equivalent circuit - current through short circuit

In this tutorial, the tutor is finding current through 12 ohm resistor using Norton's theorem. My question is: When 12 ohm resistor was replaced with a short circuit, why entire current (15-I1) isn't ...
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What went wrong with my FPGA development board?

I am currently trying my hand at creating a volumetric display with acoustic levitation much like this video. I have chosen to use a Cyclone II development board for the FPGA controller. During some ...
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PCB short circuit without any component

I'm working on a PCB and I've ordered my first prototype. However, there are some problems. I soldered the decoupling capacitors on the power line and applied a 3.6V voltage to the circuit from the ...
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Is the same overcurrent relay used for both phase-to-phase faults and 3-phase faults?

In MV grid with no distributed generators, 50-51 overcurrent relays are used to detect both phase to phase faults anf 3-phase faults. In Italy, time independent characteristics are used inside these ...
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1 answer
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Over Current/Short Circuit Protection Using op-amp and MOSFET

I wanted a circuit to limit the current to say 4A, and found this but it doesn't work in the Proteus simulator. What's wrong with this circuit? anyways to improve it? here is my expectation of the ...
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Why is a capacitor considered a short circuit at start up?

The frequency response of a capacitor says a capacitor has a high impedance at low frequencies and it has a low impedance at high frequencies (up to the capacitor's resonant frequency.) If we use a ...
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Can an RCD detect a fault on an isolated circuit?

I was installing a new plug socket today in an outbuilding of my house, which is wired up to a small circuit breaker box which houses breakers for the lights and plug sockets in this outbuilding. This ...
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How to connect a bistable valve?

I need to control a bi-stable valve: Here is the typical wiring provided for such 3 wires type valve: But I don't want to continue to feed it when actually closed or opened which is normaly ...
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Reason behind my potentiometer getting short circuited or blasted

I was implementing a small circuit in which I used a potentiometer across the Live and neutral and after a few seconds while I was trying to operate the knob the potentiometer blasted or short-circuit....
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Evaluating make-before-break impact

I'm exploring the possibility of using TI's TS5A3160 analog switch to implement a "buffer" for a square wave. The idea is, to use a square wave with a low driving capability as the control ...
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What type of power supply is best for short circuit experiments? [closed]

I do a lot of experiments with resistive elements/heating elements, electroplating research work and similarly many other experiments. I'm currently using batteries, batteries work well for some time, ...
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10 votes
3 answers
2k views

What would it mean if a circuit board all of a sudden works after it doesn’t work for some time?

Sorry for my noob question. I am very new to debugging hardware circuit boards. A circuit board was not working. After measuring a voltage rail it was jumping from 12V to 0V, and back to 12, etc. what ...
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Why would this PCB design cause a short?

Yesterday, I designed my first ever PCB. It's meant to take data from several sensors and pass the data to a Raspberry Pi, which will in turn actuate pumps to control nutrient concentrations in a ...
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1 answer
81 views

BMS design question

I recently came across this popular BMS design and I am trying to understand the circuit design There are some great technical discussions around it, like on robojax or this non-English forum. Most ...
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2 answers
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How to protect home from the main connection line short circuit?

I am living in a village and we often face issues with main connection input neutral getting shorted and having good amount of current/voltage. The transformer often gets issues, disrupting supply and ...
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3 answers
92 views

Why is there a Sub-transient, transient periods during a short-circuit event?

I am currently studying short-circuit analysis and it was mentioned that the short-circuit current can be divided into three periods, the sub-transient, transient and the steady state. However there ...
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Requesting help in identifying a potential short-circuit on a microcontroller board

Recently I've been developing a board, which for me was the most complex I've ever built. Almost all components are SMT, which was new to me. And I'm running into some point of trouble. All relevant ...
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1 answer
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Trying to fix a possible non-removable permanent fuse

I'm having some issues with a PCB in an alarm unit. I think the unit shorted. I'm now trying to identify the broken component to replace it. The board is mains powered, but also has a battery - ...
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1 answer
110 views

Is liquid silicone safe against a PCB in a mechanical keyboard?

I just bought a mechanical keyboard and in the interest of keeping it quiet have found that some people recommend pouring liquid silicone into the keyboard case to form a silicone sound dampener that ...
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1 answer
41 views

Consequences for invalid BMS wire and its diagnosis

While re-assembling the 16S BMS, I didn't notice that the socket for one 8s pack was different from the socket for the other 8s pack until I connected the plug (image 4) to the battery tape, when ...
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difference between N and X relays?

I have seen in some SLDs for overcurrent relays there is a X unit and N unit. I understand that the N unit grounding relay is for zero sequence and the G unit is sensing the current flows through the ...
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Component identification in DW01 supporting circuit

I have a nice bike light, a Ravemen PR1200 After a couple years of excellent service, the battery life dropped off and it started failing on really cold commutes. So I attempted to replace the ...
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How to modify the circuit to drive the input pin low instead of high

I am using a pre-existing circuit and it is wired as the picture below to fix the high input to RAMN. I want to drive RAMN pin low to stall the booting. Can I just use the pad of C123 and short it to ...
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26 votes
1 answer
1k views

Laptop motherboard not working, quiet clicking noise

Intro how it happened: I had cleaned my laptop from dust and reapplied the thermal paste. After this i have reassembled the device than it did not turned on. Then i took it apart connected the fan and ...
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3 answers
73 views

Shorting the crystal output

I was using such an extension shield: It is built using an MCP2515 (datasheet) controller and a TJA1040 transceiver. The resonator on it has undefined signs, so I wanted to use a logic analyzer (...
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1 answer
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Ceramic capacitor blow out [closed]

I run a SOHO system. Yesterday, a major fault caused my system to stop working. General inspection of the motherboard revealed nothing. Test bedding the board produced a flare in one of the ...
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1 answer
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Why is the line-neutral fault current 1.5x higher than the line-line fault current?

My commercial wiring textbook and several documents discussing fault current calculations stated "The L-N fault current is higher than the L-L fault current at the secondary terminals of a single-...
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1 answer
85 views

New car battery (12V) internal short circuit

For a new car 12V battery (electrolyte full) without any accessories/cable connected, no charging/discharging, what will happen when there is an internal short circuit (one of the internal positive ...
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IC melted down by connecting oscilloscope ground, but why?

I am currently digging into electronics and today I experienced a strange problem. I rebuild an oscillator circuit with the 30106 IC and I wanted to measure with my new oscilloscope (it is a china ...
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5 votes
5 answers
2k views

Is forcing power through a faulting board a good diagnostic tool?

I was researching how to diagnose what SMD was shorting on a laptops motherboard when I found an unusual diagnostic test. The video I came across showed a tech using a variable power supply to force a ...
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0 answers
53 views

Is it safe to short signal to max in a volume control potentiometer in a video doorbell?

I have a video doorbell as in the picture below: However, I cannot hear the bell when it rings. So I opened the device to get to the control volume potentiometer. As in picture below: What I did is ...
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2 votes
3 answers
994 views

Why did this fog lamp turn on with either configuration of power/ground? [closed]

My friend and I were replacing a burnt out fog lamp on his car. When it was time to make the connection, I wanted to make sure which wire was power and ground, so we don’t cause a short to the new ...
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3 answers
165 views

Explain short circuit by current division

As the textbook page shows above, why do we conclude \$i_1 = 0\$ by merely concerning \$R_2 = 0\$ without concerning \$i\$ is a function of \$R_2\$, where: $$i = {V\over R_{eq}} = V\cdot{{R_1+R_2}\...
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2 votes
1 answer
148 views

H-Bridge using 2 half bridge drivers shorts when powered on

The goal is to control various Peltier modules using an H bridge and a PWM signal. I've designed this schematic and made a PCB out of it. It is an H-bridge using 4 IRLR7843TRPBF high power MOSFETs and ...
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153 views

I shorted my Arduino Uno from 5V to GND and now i think both pins are dead

So basically I shorted my Arduino Uno and I think the 5V pins and GND pins are dead (yes those are the ones I shorted) I was playing around and I did a really stupid thing, what I did is I got 2 MF ...
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1 answer
143 views

When do I have to worry about shorting? (Coin cell battery assembly)

At work I assemble coin cell batteries (lithium ion) inside a glovebox. I'm a bit confused as to when I do and do not have to worry about shorting. For example, say I'm making this battery: Cathode: ...
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1 answer
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Relay driver circuit causes 5V line to get pulled down

PLEASE NOTE: The schematic is slightly wrong. It is a MOSFET in my circuit, not the BC850 BJT. The actual part is: BVSS138LT1G Link to MOSFET part Problem Summary: In the circuit below, I'm turning on ...
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1 vote
0 answers
109 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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1 answer
142 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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1 answer
69 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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0 votes
2 answers
194 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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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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1 vote
1 answer
119 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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1 answer
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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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1 answer
56 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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0 answers
28 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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0 votes
1 answer
77 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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