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Questions tagged [short-circuit]

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

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71 views

Short Circuit Question

I know that static electricity can damage components, even if it does not destroy them or “break them” studies and tests have shown that it could decrease performance even a little if no noticeable ...
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1answer
37 views

Mosfet testing for short from youtube repair video

In the 23:40 of the youtube video https://youtu.be/YQ7SXJqIpzs , the presenter does a p-channel mosfet test for short, using his bench power supply on the circuit. From what i understood, he ...
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34 views

Transformers: Short-circuit test

In a short-circuit test where the secondary winding is short circuited, how come the primary voltage isn't zero (in real life) when it should ideally be zero?
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why does the peak open-circuit current increases nonlinearly whereas the applied voltage increases linearly for a transformer [duplicate]

Considering a transformer, the back-EMF equation tells us that the peak flux density is proportional to the AC supply voltage. Knowing that the current which flows in the transformer under open-...
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36 views

Both fuse and circuit breaker operated

Is there a reason that both a fuse and a circuit breaker would operate? From my understanding, the fuse should blow first and kill any current flowing through it leaving the breaker intact. So why ...
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1answer
43 views

Testing 8 pin P-Channel MOSFETS on Laptop Motherboard

My laptop died recently and I’m testing the motherboard. I’m led to believe these two MOFSETs on the board may be part of the issue PQ301 and PQ302. Using a multimeter continuity and diode mode; ...
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85 views

If a short circuit occured across the mosfet would anything happen in this scenario?

I am just confused about understanding a simple concept. For the following circuit: Say the blue line acts as a short for whatever reason. If the LED has a forward voltage drop of 23 V and forward ...
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64 views

Is it possible that a load can be destroyed if I am disconnecting all other loads in the circuit but one?

I consider myself as a beginner, so please don't be that hard to me. Can I theoreticaly destroy a unfused load if I disconnect all loads but one in the same circuit? In my understanding the current ...
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82 views

Why were the fuses not protecting the circuit? [closed]

I bought a Aprilia SR 50 Scooter with a "small" problem, the frontlight and the horn are not working, because the 10A fuse does blow up if the key is turned... I don't know what happened today, but I ...
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36 views

Transformer and Thevenin Theorem

Consider an ideal transformer connected to a real AC voltage source (with output resistance Rg). Now consider to apply the Thevenin theorem between the output terminals of the secondary circuit. I ...
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1answer
71 views

Why short circuit occur when the hot line touches the neutral wire (aka ground)?

The charges move from negative (hot wire) to positive/negative (neutral) to make the device work right? So why would the Short occur only when they are directly connected? Wouldn't they just flow ...
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118 views

Can I use a 78S05 regulator in place of 78L05?

I'm trying to do this circuit : Can I use a 78S05 regulator instead of the 78L05? Or I need the 78L05 to realize this circuit. Best regards
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3answers
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Why Does this Short? [closed]

simulate this circuit – Schematic created using CircuitLab I'm new to electronics and wired a dc motor to a battery and switch. After the battery got really hot, I realized that it was probably ...
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88 views

Short Circuit Protection Circuit

I have designed short circuit protection circuit that you can find in the image. https://i.hizliresim.com/ZXPvWz.jpg When you supply 24V from L1 pin and there is no GND(no short circuit) in L2 pin, ...
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67 views

Both sides of a voltage level shifter connected

The TXS 0108E is a level shifter circuit, performing, in my project, a shift level voltage from 3.3V to 5V . Because of a design error in the wiring diagram, I left some pins with the same name on the ...
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27 views

PMOS Drain-Source Short at Turn-On

In the attached image, without C1 & C2 (used only as de-cap) mounted, when 24V is given at TP1 and nMOS (Q1) is turned ON, the circuit works fine and I get 24 V at TP3. But when C1 & C2 are ...
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82 views

Detecting both short and open circuit voice coils in coil driver

I'm building a voice coil driver for a science experiment. The coils are in an environment where both coil shorts and coil open circuits are common problems. I'd like to build in a fault indicator to ...
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1answer
262 views

Removing debris from PCB

I have a PCB with no solder mask with a very dense layout and a very fine trace spacing. I didn't get a solder mask because it's still in the prototyping phase, and it's way cheaper. I keep having ...
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2answers
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What's the purpose of these copper coils with resistors inside them in A Yamaha RX-V396RDS amplifier?

This is an bit of an overly specific question, but I'm curious about the purpose of these coils inside a Yamaha RX-V396RDS amplifier and wondered if anyone could explain what they're for. They appear ...
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1answer
96 views

I2C Relay Circuit shorting & sparking

I'm having trouble diagnosing a faulty circuit. Here's the schematic, which is based on this instructables build. This is part of a bigger circuit, but I have tested it in isolation on a fresh board. ...
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63 views

Does short circuit always (in every electronic circuit) shunt the resistor that has both sides connected to the short circuit branch? [closed]

I wanted to know if short link always (in every electronic circuit) shunt the resistor that has both sides connected to the short link branch
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1answer
54 views

How to power an electric motor

I would like to attempt to assemble an outrunner BLDC motor from scratch. Its working principle seems ridiculously simple and I'm up for the challenge. There is one thing that I would like to clear up ...
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1answer
46 views

Power amplifier shows 0 input and output resistance

I have a non-functioning transmitter for a radar I've built. When I was checking for shorts using a multimeter, I noticed that the resistance measurements between RFin and GND and RFout and GND of my ...
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78 views

Connect 5V straight to resistor straight to ground

I'm very new to electrical engineering in general and picked up an Arduino recently. I have a couple questions: What will happen if I short 5V/3.3V/Digital pin output directly to ground? Will it ...
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1answer
44 views

What would cause a voltage rail to be held low without measuring a short circuit?

I have a circuit that provides power (1.8VD) to an FPGA and some ADCs. I have seen in the past where damage (ESD, EOS, etc) occurs to one of the ADCs. This causes a short from 1.8VD to GND internal to ...
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54 views

SIM800L short circuit between VCC, GND and NET

I've soldered my SIM800L module like this. When I'm checking with multi-meter, I'm getting a short circuit between VCC, GND and NET. Why this is happening?
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56 views

How to calculate the Short Circuit current of a small DC circuit?

I need to do a short circuit test for my DALI slave device. I have observed a maximum load of 140W at 210V-rms (Load current = 650 mA , PF = 0.975). I have to do a short circuit at the load side and I ...
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0answers
61 views

CAN Transceiver Behavior during fault conditions

I was just trying to understand the CAN transceiver TJA1042T behavior during fault conditions: CANH short to BATT CANH short to GND CANL short to BATT CANL short to GND I'm powering on the ...
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1answer
63 views

CP2102N Short Between D+ and D-

I am measuring a short between the D+ and D- lines between the USB micro connector and USB to UART chip (CP2102N). However by looking at the photos, there doesn't appear to be a short. Should I assume ...
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2answers
85 views

Voltage Drop doubt

In an ideal circuit with just a battery short circuited, where there is no resistance in the wire, why is it necessary to have resistance along the way? I understand Ohm's Law, and that the current ...
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1answer
42 views

How do I choose appropriate fuse for my circuit?

I am currently using a AC-DC adaptor with specs: AC-I: 100-2040V~50/60Hz 1.6A DC-O: 12V 5A Which is powering up 8 DC motors, 4× 12V 6W 4× 12V (wattage not specified, the motor is meant to be ...
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1answer
109 views

Avoid fire on a battery-powered device [closed]

I was trying to repair a battery-powered electric razor when I suspect there was a short-circuit. The device started heating and it began smoking a bit so I took it and put it in a bowl full of water....
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193 views

Why is the secondary winding of a current transformer shorted?

I understand that the secondary circuit in a current transformer cannot be left open, as it will result in a very potential difference being induced in the core of the transformer and permanently ...
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2answers
303 views

Why do engineers usually short ground and negative ports on a DC power supply?

I'm fairly new to electrical engineering, and have seen many DC power supplies where someone has shorted the ground (green) port with the negative (black) port. From my understanding, the ground is ...
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101 views

Why did my Teensy 3.6 break?

My battery-powered circuit is supposed to collect data from some sensors using a Teensy 3.6. It worked for a few days (maybe 1hr total of uptime) and then something broke. All of the sensors and power ...
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205 views

What happens to the energy stored in a short-circuited capacitor?

Suppose we have an ideal capacitor with a certain voltage between its plates. We connect the two plates using an ideal (lossless) wire, so the capacitor discharges. Where has the energy having been ...
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143 views

Transistor circuit driving me insane

Consider the following circuit: Now I'm asking to impose the base current as zero and $$R_C=452.35 \Omega $$ Now I have a lot of issues with this circuit because I can't find a systematic way to ...
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55 views

why would Ix would be 0?

Current coming out of the 5V source would never be 0 so what would make the current coming out of the 3v dependent source 0?
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30 views

For given circuit, does the current “io” through the branch equal zero after short circuit ? [2-port network]

The circuit is; simulate this circuit – Schematic created using CircuitLab For given 2 port network, Im shorting V1 to solve for y22 and y12 and apply a current source at V2.[Y-Parameters] ...
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119 views

Can the USB port's metal enclosure be grounded?

As shown in the image below, the USB port's metal enclosure is touching the copper clad of the PCB (which is a ground plane). Can Bad Things Happen™ if the port's enclosure is grounded? I beep-...
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33 views

Measure unknown load resistance on battery terminal

I need a method to measure the load resistance attached to the terminals on a battery. I want to determine this load before I turn mosfet on to let battery pack discharge. Most important I want to ...
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71 views

'Bug fixing' a circuit with HiLink HLK PM01 220V->5V converters

I soldered a DMX splitter together. However, it does not work. I'm sure one of the solder connections broke, but I have to find which one. I want to do this with power connected because that is ...
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1answer
70 views

What does it mean if my voltage regulator is acting as a wire?

When i connect 24V to my input pin, and connect ground pin to my Ground, it gives a short circuit at the bench power supply. What does this mean? Did i kill my voltage regulator?
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121 views

Scenarios where Inductor back EMF would result in damage of circuit or component

Let's say that there is a simple circuit with the following components (ignore values): LEFT: a simple power supply (assume DC) TOP: load (resistor) and inductor RIGHT: switch BOTTOM: load (resistor) ...
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80 views

Won't a potentiometer powered by a dc supply cause a short-circuit at lower end of the range?

Many tutorials in the Arduino or Raspberry Pi community simulate an analog sensor with a potentiometer. The potentiometer, being a passive device, is powered from the same DC power source that ...
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2answers
122 views

How can charging current be understood intuitively?

The charging current I’m talking about would be the one between un-shorted phases and ground when there is a short to ground in one of the phases in a distribution network or facility. I'm not talking ...
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148 views

Shorting capacitors using a transistor?

Introduction First off, I'd like to let you know I am a beginner at electronics so some of the stuff I say might be very wrong. What I want to make is a 'spark generator' for lighting some gases in ...
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2answers
156 views

How to find v through superposition theorem in the following ciruit

What is the voltage V of the attached circuit? Using super position theorem. When i active the 9V source & short 12 V source is the current follows in 20 ohms, 10 ohms. & 4 ohms? Or it only ...
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50 views

Over-current sense

I am using a circuit shown below. it is designed to sense 1.5 A whenever the load takes current >= 1.5 A. Rsen senses the related voltage and activates the transistor. Here I use a Rsen = 0.46 R(0.7V/...
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1answer
60 views

How short circuit is made when connecting negative cable first when jumping start the vehicle

When Jumping start, I understand that I need to connect the positive terminal first due to the safety reason. And also if I connect negative terminal first and touching the body of the vehicle with ...