Questions tagged [short-circuit]

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

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1answer
143 views

Is there a simple short circuit protection available?

One of my little copy/paste projects died again (a 12V 1 A circuit - last time it died). Now it was a short that caused it. Is there a simple way of keeping my parts from burning? By simple I mean ...
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2answers
1k views

Using diodes for reverse polarity protection

I want to protect my circuit against reverse polarity, by simply adding two diodes in parallel between the + and - input cables. So if the polarity is reversed, the current will go through those ...
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0answers
331 views

Protecting the op-amp against output short circuit current with a resistor

There is an operational amplifier LM258WYDT. The output of the operational amplifier will produce a voltage in the range from + 12V to -12V and generate a PWM signal. Datasheet: Short-circuits ...
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2answers
147 views

Reducing the circuit

I am high school boy, our teacher gave us circuit and we have to find out the equivalent resistance. . Our professor gave us idea that we can solve this question either by either superposition ...
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1answer
69 views

How can the dielectric constant of water be so high but water on electric devices can cause a short circuit? [closed]

Is it only the fact that pure water has a high dielectric constant and non-pure water i.e. the water that usually causes a short circuit is contaminated and it's the contamination mixture in the water ...
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1answer
1k views

Opamp output short circuit protection

I am trying to build a voltage generator 0-10V to feed the input of a PLC ADC card (for simulation purposes). The PLC card has an input impedance of 133k. I am thinking to use the circuit from the ...
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1answer
115 views

Storing solar panels in direct sun

What is the best way to store solar panels when not hooked to a charge controller in direct sun? I was thinking about hooking each panels pos and neg mc4 connectors to itself so it will not be ...
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1answer
43 views

Determine the total electric power of the circuit with 2 types of voltage?

When 3 lightbulb have an electric power of 60, 100, 150 respectively V= 220Voltz. Determine the electric power consumed for each lightbulb that are connected in series when the V=380Votlz I am ...
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1answer
59 views

Does melting microwires cause internal shorts

If you overheat a chip, you can melt the microwires attaching the wafer to the package. When this happens, can the melted microwires cause shorts between the pins of the chip, inside the package of ...
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2answers
343 views

Current Source and Short Circuit

let's consider this circuit: How can I analyze it? Which is the expression of the current in the short circuit? Is it correct to split the circuit in the following way (I always did it when there was ...
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1answer
229 views

How to power a nickel chromium wire to produce heat without burning the power adpapter

I want to build a toaster just for fun. I want to buy a nickel chromium wire to heat the toaster's plate. How to avoid burning my power adapter cuz the resistance is too low. I currently have a ...
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0answers
69 views

High Voltage shares ground, Problems?

I am having a problem with identifying why a high voltage part of my circuit broke the low voltage controller. To start, the basic premise of the circuit is to take a very accurate 0-10V DAC voltage(...
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2answers
136 views

Can an electrified wire ever be safe against bare skin?

This could sound ridiculous to someone with an ounce of experience, but I'm just getting started, so here we go ;) Full question is 3 parts... First, what is the lowest amperage needed to light an ...
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2answers
384 views

Definitions of elements, nodes, branches, loop, mesh for a network with short circuit

CONTEXT This question is intended to highlight the lack of precise definitions of basic circuit terminology that I have found. For example, consider the following definition of branch. "A ...
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2answers
667 views

Do Duracell AAA batteries have internal short circuit detection?

I was shorting a Duracell AAA battery in a SAFE area with proper precautions. After 2 minutes I disconnected the circuit and measured the voltage, it dropped from 2.8V to 2.6V and the battery was hot. ...
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0answers
66 views

Reverse voltage protect circuit

I am trying to add a reverse voltage protection circuit to my circuit. I searched for some circuits and simulated them with an online simulator (Circuit Simulator Applet). It might work as I need it, ...
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1answer
331 views

Zener diode (Power rating exceeded)

The following is an exam question I encountered. In the above circuit the current across E is 180 mA. Since the current across 300 Ohm resistor is 13.33 mA, there will approximately be a current of ...
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1answer
116 views

Strategies for troubleshooting buck converter

I'm trying to troubleshoot a tps65261rhbr triple synchronous buck converter from 12V producing 1.8V, 3.3V and 5V. The 3.3V and 1.8V are stable and well-functioning but the 5V is not. An oscilloscope ...
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5answers
1k views

When you connect two batteries in series, why doesn't the middle short?

When you connect two batteries in series, why doesn't the middle short? The connection between the positive terminal on one battery and the negative terminal on the other battery has no load, so ...
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0answers
50 views

Over Curent protection for multiple consumers

While designing a light fixture I came across an issue. The fixture is powered by a single ACDC unit that generates 24V. The fixture has around 50 LED elements that are connected to the power source. ...
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2answers
721 views

STM32 MCU gets shorted

I've been trying to make a simple audio player using the STM32F302CBT6, however, the VCC and GND pins of the MCU keeps on getting internally shorted when a 3.3V power supply is provided and a faint ...
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51 views

TPIC6C595D Q0 pin is always high

Good day everybody! So I have a LED clock circuit, which I designed, powered by an atmega328p xmini, and whatever I do the first pin of the shift register which does the current sinking (TPIC6c595D) ...
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2answers
249 views

Detecting when an illuminated AC doorbell is pushed

I have an 8VAC (can be switched to 12VAC if required) pushbutton bell which is in series with two "ding dong" chimes. The button is illuminated with an incandescent bulb, also in series. Pushing the ...
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0answers
139 views

TDA7294 blew up [closed]

I have created this schematic connection of TDA7294 on and had a PCB solution. Connected to power supply +-25VDC. But at first start the TDA7294 blew up without any load on output pin. I started check ...
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7answers
472 views

Two short circuits

I wanted to ask a concept but couldn't guess how to explain so I'm taking help from this example. This is not a homework problem. Now my doubt is all the current will go through the horizontal ...
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2answers
569 views

Why would a BMS (or other circuit) have reduced voltage after a short?

I have this 9Ah 42v battery pack protected by a BMS wrapped in a shrink which I would rather not disassemble (so I don't currently have access to BMS' circuit). It has two wires for charging, and two ...
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4answers
262 views

Short Circuit Question [closed]

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
289 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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2answers
226 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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2answers
52 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
3k 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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2answers
182 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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2answers
69 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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1answer
177 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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3answers
517 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
889 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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3answers
983 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
94 views

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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1answer
306 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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0answers
64 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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429 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
311 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
4k views

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
211 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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2answers
103 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
68 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
57 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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1answer
1k 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
73 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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1answer
70 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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