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Questions tagged [short-circuit]

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

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24 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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34 views

Partial power outage ,facing single-phasing [migrated]

My short name:Teza, we have had partial power outage in our house since months ago. First we would hear a short chirp sound then we would see flickering of some light bulbs, then power would go out, ...
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42 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
256 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
3k 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
83 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
62 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
51 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
43 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
67 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
42 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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22 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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1answer
55 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
50 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
39 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
80 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
38 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
107 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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2answers
103 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
203 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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0answers
92 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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4answers
196 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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2answers
140 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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3answers
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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28 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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1answer
82 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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1answer
30 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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0answers
67 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
63 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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2answers
95 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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2answers
75 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
120 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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2answers
129 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
130 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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2answers
46 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
55 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 ...
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3answers
94 views

How can I find out which resistor is short-circuited and can be ignored?

I don't understand how the current flows in the circuit below. How do I deal with the wire between nodes c and a, a and b, g and d. Why is the 5 Ω resistor shorted out? I am having a little trouble ...
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1answer
40 views

How to protect against a short circuit fail in 12VDC X capacitor?

When adding an X capacitor for simple line filtering in a 12V DC electronics project, how would you add protection against an unlikely short circuit failure in that capacitor? Is it as simple as a ...
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1answer
58 views

Short-circuit protection, reverse polarity automotive

I am designing a power circuit and would like to integrate the ic VN5160S to protect it, but I have doubts about the position of it. Would the ic VN5160S be before the DC / DC converter in my circuit? ...
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1answer
51 views

MOSFET-switching between two power supplys: how to avoid transverse current?

For a hobby project I would like to switch between two power supplys. The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
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1answer
342 views

LTSpice chassis ground or earth ground

I'm trying to simulate a circuit for a design I'm making. In a few parts of what I'm interfacing with uses relays that when closed will short a few power supplies to the chassis ground and in LTSpice ...
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1answer
99 views

Measuring soil resistivity and estimating soil equivalent resistance in a long distance

I'm trying to size the Neutral to Ground resistor (NGR) in the Wye of a 138 KV to 4160 V Delta-Wye Transformer. In order to find the proper value I have estimated the charging current of the system by ...
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1answer
96 views

How do I connect an oscilloscope to a power supply or function gen.?

I'm supposed to sketch a circuit for my class but the one thing that has me completely confused is the ground connection. For example: I have a breadboard with a 10V dc power supply and two ...
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2answers
111 views

Build my own light bulb

Before I start: I do not have a lot of experience in electrical engineering so I would appreciate clear statements and extensive explanations to be able to follow your ideas. I am currently trying to ...
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1answer
69 views

In a DC circuit, are there any reasons for wiring overcurrent protection such as fuse or pptc PHYSICALLY near the load?

In a DC circuit, are there any reasons for wiring overcurrent protection such as fuse, pptc, etc.... PHYSICALLY near the load(or inside it)? By wiring "physically near", I mean in the power wire going ...
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3answers
168 views

PCB plated through hole short-circuit

We have a board built in the thousands, and several have (apparently) short-circuited a plated through hole (PTH) to an adjacent pour (see photo, note the other thermal damage is probably due to ...
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1answer
64 views

Does shorting this branch disable these resistors?

When I short the branch across the nodes connection R15 and R10 will they be disable, and I only need to calculate R6||R6||R24 + R2?
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1answer
56 views

Internal constant current driver for LED short circuits and blows when connected to AC main (120v) without DC load

I have AC 85-265V to 0.3A 8-12W DC 22-40V Internal constant current power supply for LED spot lights. This is the exact model https://www.lightinthebox.com/en/p/0-3a-8-12w-dc-22-40v-to-ac-85-265v-...
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5answers
3k views

How can I troubleshoot an active short circuit?

What are some effective methods of diagnosing an active short circuit? By this I mean a short circuit that presents itself only after a PCB is powered on. tl;dr I have a design in the prototype ...
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3answers
86 views

How does current flow in the short circuit? Aren't the two ends at the same potential?

How does the current flow in the short circuit wire ? Isn't potential difference necessary for existence of current?