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Questions tagged [short-circuit]

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

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21 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
51 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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43 views

Using circuit breaker instead of a fuse

I am making a contraption that uses an atmega328 to trigger a water pump to water the garden plants on a schedule. The controller will run on low power mode to sleep all day and wake up to water the ...
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2answers
56 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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61 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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1answer
77 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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91 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
61 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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38 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
54 views

Good examples of radial circuit board designs? Radial Real Estate Circuitry? [on hold]

Do you know any good examples of Radial Circuitry? I like this but automated I think this requires a 5 axis CNC. I am thinking Negative Terminal mountings and stuff like potentiometers and 5 way ...
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1answer
44 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
86 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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31 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
42 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
36 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
50 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
79 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
49 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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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
47 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
128 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
59 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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29 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
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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
77 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?
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1answer
64 views

touch negative and positive side of battery briefly

I on accident made a brief connection between the positive and negative size of a 3.7v battery. Connection was for less than half a second but I saw small amount of smoke come out from the wire. Can ...
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1answer
108 views

Why is my RF switch catching on fire?

The pictured circuit below works nicely as a electronically switchable-gain photodiode amplifier. Except for the small issue that as it is being plugged in, U2, a fast CMOS RF switch, has a ...
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1answer
112 views

Why is a short circuit in the secondary winding of a transformer reflected on the primary side?

I was reading this answer and I would like to understand why if the secondary is short circuited the primary winding will also reflect the short circuit despite the fact that they are isolated. Would ...
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3answers
74 views

In what kind of circuit does current flow?

In what kind of circuits do current flow? For a circuit to be "closed" does the end point have to return to the start point like in the first image? If you have a straight line conductor between two ...
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2answers
47 views

Short circuit calculation for KNAF transformer

I am using a 2MVA transformer (KNAF rating will be 30% more at 2.6MVA) The question i have is whether we calculate the short circuit rating based on 2MVA or 2.6MVA? I'm using pu method to calculate,...
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1answer
49 views

FLUKE 15b+ fuse test

I have accidentally shorted my circuit (5 Volt Vcc) for approximately 1-2 seconds max. While the circuit was short circuit I use the FLUKE as ampermeter in miliAmper mode (400mA max fused) The current ...
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46 views

What is the cause of Capacitor short & Soldering pad short & Current unstable on PCB as powering up over time

For the first time, I made a 4 layer PCB and used a lot of 0402 cap / res on my board. But after I soldered the board, the circuit can only work for several mins. The four layers include 3 signal ...
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42 views

Usb micro b 19V and 2.1A safe?

Is it safe to run 19V and 2.1A DC through a usb micro b with no arking and little heat. I know that usb can handle 5v and 2.1A but with the extra voltage can it handle this and not short.
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3answers
80 views

How can guitar pickups hot leads be wired in parallel without causing current problems?

I am looking up wiring diagrams for electric guitar pickups and noticing that the common method for combining two pickup signals is just to have a switch that can optionally have both the hot leads ...
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24 views

LED COB, Meter reading voltage on isolated backplane when powered

I'm setting up a project lamp for my workbench using one of these LED COB I checked for continuity while doing a test setup, the live and neutral connectors are isolated from each other, and the ...
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1answer
46 views

What will happen when taps at secondary side of auto-transformer are connected together (short-circuited)?

In case of Auto-transformer, there is only one winding, having three lead wires (1 for primary/input, 1 for secondary/output, and 1 common between both). At the secondary side (the output side), there ...
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1answer
106 views

Cause for failure after short circuit Step-Down Converter Input

I'm currently evaluating the Semtech TS30042 step-down converter. My input voltage is 24V, output voltage is 5V. I followed datasheet recommendation in my layout in most aspects. The problem is, as ...
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1answer
33 views

Long vs Short Earth Connection for Single Phase Motor vs 3 Phase Motor Frame

What is the correct way of grounding single phase motor frame if I have to choose between two options: (1) Short to earth connection: from the frame to nearest grounding rod. See below the schematic....
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1answer
62 views

Capacitor for spot welding

I've seen a video where the guy make a spot-welder using capacitors https://www.youtube.com/watch?v=1SMUFSiaV-8 AFAIK shorting capacitor is harmful. The question is: Are there any caps that can ...
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1answer
25 views

Need advice with pin connection of an LCD module

Hello. I am working on this LCD module, COG-C144MVGI-08. Like in the image I uploaded, PIN 1, 4 and 12 are ground. (Just in case you need the full datasheet : https://www.avrfreaks.net/sites/...
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1answer
56 views

How to fuse batteries connected in parallel?

I have two GEL batteries 12V/130Ah and want to connect them together in parallel. Currently I have one battery in the system and it is fused on the positive wire before the isolation switch. I ...
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1answer
39 views

Testing short in circuit

I think it is a very simple test to perform, but I do not know the correct equipment for this. I just have a basic LED circuit, resistor before LED, but I want to test a short in parallel with the ...
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2answers
121 views

Thevenin Equivalent Network: How to treat Capacitor across 0v potential, with Dependent Sources?

We were given this question in our intro to EE course: Find the Thevenin equivalent network between points a and b for the circuit shown in the image below: For the short-circuit current, I redrew ...
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2answers
104 views

Power plane short in PCB

I have a multi layer board and have 2.5V plane as one of the layer. Some how during testing something go shorted on 2.5V. I am using the Toneohm 950 to detect the plane short after removing whatever ...
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1answer
54 views

Inductor for MOSFET protection

Help me understand the role and effect of an inductor used in the following electrical circuit. The circuit in question is a power supply circuit for around 50 servers in a data center. The circuit ...
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3answers
90 views

Pull-up resistor circuit clarification

I'm new to electronics and I'm trying to understand pull-up resistors properly. I have a problem with the following schematic: I've redrawn the schematic into my following schematic for better ...
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2answers
68 views

Do defective voltage regulators pass full voltage through?

I'm suspecting my voltage regulator is defective because I made the same circuit twice with the exact same components but this time, the battery voltage of 7.2V is being passed to the entire circuit ...
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1answer
109 views

What happened when you put two light bulbs to complete the circuit [closed]

I have an argument.. In the top section we have two wall plugs hooked up like a common circuit. In the bottom section if we plug two consumers will it work, will it work half the power or it will ...
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49 views

lecroy 9314l power supply repair

I've been trying to repair my lecroy 9314l for the past couple of days and i've sort of run into a wall. out of ideas. The power supply started to fail a while ago. It wont turn on when i connect a ...
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3answers
138 views

Flooded LAN RJ-45 connector may damage connected router? [closed]

I had an accident in the house and one of the LAN (cat. 6) cables including RJ-45 connector has been flooded. This "flooded" cable, along with other (dry) ones, was connected into a working gigabit ...