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Questions tagged [short-circuit]

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

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How to connect a lamp with uncoded wires without causing a dangerous situation (improve understanding of earthing) [migrated]

I uninstalled a lamp in my grandparents house and it has three wires, two of which are connected to the same terminal (see image below). The lamp was functional and I'm wondering how that worked. ...
Alon's user avatar
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2 answers
113 views

How to connect the transformer in this three-tube DC regenerative shortwave radio from aliexpress?

I've bought a three-tube DC regenerative shortwave radio on Ali-Express/China just to try building. As far as I can tell all the parts are here except for one thing. A schematic. Has anyone tried ...
Rick Steiner's user avatar
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2 answers
69 views

What happen if both sides of LED connected to positive?

Question 1: If we connect both ends of an LED to the positive terminal of a battery, will it create a short circuit and damage the LED? Question 2: If connecting both ends of an LED to the positive ...
Furkan KARADENİZ's user avatar
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2 answers
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Heatsink can cause a shortcircuit what kind of problem occurs?

I'm not sure what will happen in this kind of scenario I'll share the photo of two diodes and basic connections below. These two diodes tab points are actually connecting same node because of tab is ...
MSB's user avatar
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3 votes
5 answers
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Will this short circuit to turn off an LED drain the battery?

The above image is of a small little box I'm working on; I want an LED to turn on while the box is open. I've made this small circuit and in theory it should work perfectly, given that electricity ...
Gijahara's user avatar
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Why did my microcontroller emit smoke?

My setup is as follows: I have an RGB LED driver board powered by a 24V SMPS. The microcontroller, an ESP32, is connected to the driver board by RGBW PWM lines and a ground line. The ESP32 is also ...
flimsy's user avatar
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Fan controller using ESP32

I have designed a fan controller using ESP32. It was working fine initially when we checked by giving the bulb as load. After that we connected it to a fan, and then it started brownout during the ...
Aakas Pulikkal's user avatar
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1 answer
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Will I1 current be same as the current through the controlled source here?

I was solving this question related to two port parameters. I am confused as to what will be \$I_1\$ when \$V_1=0\$ i.e. the input port is short circuit-ed, since the controlled current source, \$gv_x\...
Koustubh Jain's user avatar
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2 answers
59 views

Parameters- H, Z, G, Y

So, my question is regarding H, G, Z, Y parameters. For instance when I am looking for h11= V1/I1 while V2 is zero, I know that on the right side where V2 is placed the circuit will be short circuited ...
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2 votes
1 answer
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High-Side NMOS Short Circuit Protection: How to Calculate Maximal Allowed Turn-off Time?

I'm about to build a high-side MOSFET switch that can switch voltages up to 150V to an external load (0.5A nominal). For this application I would like to use the N-Channel MOSFET Vishay SiHH240N6E. ...
Mau5's user avatar
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Did Micro-USB have protection against "loops"?

I have an older USB power brick from a reputable, well-known company (i.e., not rock-bottom re-branded cheapest-as-possible). It has a female USB-A connector as output, and a female micro-USB ...
AnoE's user avatar
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10 answers
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How can I find where a short has occurred inside of a PCB?

I have designed a board in KiCad that I then had manufactured by JLCPCB. It has a ground plane and a 5V plane, which are shorted together. This does not appear in the schematic or PCB files. How can I ...
Jackedak's user avatar
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3 votes
3 answers
194 views

N MOSFETs conducting even with 0 Vgs

I have a three-state circuit which flips the polarity of a small resistive load using two push buttons. The input is some battery voltage, between 10V and 25V DC. The output is two pins: A and B. The ...
biobuilder's user avatar
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1 answer
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Does connecting the ground of a power source to the neutral of the lamp cause a short circuit?

Does connecting the ground of a power source to the neutral of the lamp cause a short circuit? In other words, would either of the connections below cause a short circuit?
Silver Ringvee's user avatar
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TRS headphone output socket that may be used with a TS mono jack: how to prevent short to ground?

I'm using a TPA6132 headphone amplifier connected to a stereo (TRS) output socket. In my application, the output will usually be used as a line output, and only occasionally with headphones. The audio ...
one_three_three_seven's user avatar
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3 answers
160 views

Asking for help, ESP8266 and AMS1117 get fried

I have a problem with the project I am currently working on: https://git.la10cy.net/DeltaLima/CanGrow/ I designed and ordererd a PCB for it and tried the schematics on a perfboard beforehand. But ...
DeltaLima's user avatar
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Recoverable overcurrent protection of MOSFET using eFuse

I am looking into a way to improve over-current protection of an industrial device with switching contact output (based on PMV37ENEA MOSFET) that is rated for 1A / 30VDC load. The PMV37ENEA is ...
rostokus's user avatar
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3 answers
299 views

What will happen if a bulb is connected to two live wires?

In the two-way switch below, the bulb can be connected to either two hot wires or two neutral wires to turn it off What will happen if a bulb is connected to two live wires? Will the current flow ...
Rin Hoo's user avatar
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35 views

SCL line Pulled Low all the time

I have made a custom PCB with nRF52840 and Three slave Devices(IAM-20380 Gyro), (ADXL372 Accelerometer), (VCNL4040 Proximity ) Sensors. All slaves are connected to one I2C Bus When I plug only power ...
Zunuran Nasrullah's user avatar
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Trying to fix illko zerotest

I was measuring with my zero test and the fuse blew up. I changed it and yet it was not showing any values. So I changed the BUL216 transistor as it seemed shorted (the other one looks alright). Now ...
Matúš Kostka's user avatar
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3 answers
106 views

Can I control a motor in both directions using two sets of dry contacts

Using a device like a Shelly Uni, which has controllable sets of dry contacts, can two sets of dry contacts be used to run an electric motor in either direction, using only one power source? Ie, ...
Globe B's user avatar
1 vote
2 answers
93 views

Is this resistor network simulation OK?

In circuits as shown in picture 1 there lies a short wire in between as marked in picture two. In my attempt to find the direction of the current flow on that kind of example circuit, shouldn't the ...
dandelionseeds's user avatar
1 vote
1 answer
126 views

Individually Addressable LED overheated

Update (19.3.24) I checked the LED string with a multimeter. The + and - wire of the burned LEDs are connected, whereas the new LEDs do not have a connection between the + and - wires. I checked the ...
TLB's user avatar
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How to avoid short circuit on battery wires on a charging circuit

I built a mobile robot which uses 24Vdc 200Ah battery pack to power 2 DC motors. The circuit used to power the system is pretty robust, I used a relay to switch the motor controllers on and off, and ...
Marcus Barnet's user avatar
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1 answer
63 views

LTspice bootstrap half-bridge simulation peak current problem

I was working with the simulation I attach below. While testing my simulation I was confused when I observed a short circuit on the half bridge, and it did not get better when I added extra deadtime ...
MSB's user avatar
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4 votes
2 answers
383 views

Two X capacitors from lines to ground- why? GFCI fault, even after replacement

I'm trying to repair a very old printer (circa 1980). When I plugged it in, the GFCI outlet protection immediately tripped, even with the printer turned off. The hot side of the cord is connected to ...
BZo's user avatar
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55 views

Is my PCB shorting to ground?

I am working on a senior design project that utilizes a 3.7V lithium ion battery. Before I connect to the board, the pins show 3.7V (as expected). When I plug the battery into the connector, measure ...
Carson Green's user avatar
0 votes
1 answer
146 views

Identify IC component (voltage regulator?), L8=6G 93W

I connected the PCB to the power supply to check which parts received power and which did not. In doing so I fear I may have short-circuited the 2 components, in fact they have now become hot when ...
EleHob's user avatar
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1 answer
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Equivalence in circuits

I'm studying circuit theory, with only linear elements and no capacitors or inductors or mutual inductances, so no differential equations. All the sources (current and voltages) are constant. To be ...
selenio34's user avatar
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1 answer
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How to design short circuit and reverse polarity protection for PCB?

I have read many posts and articles about short circuit and reverse polarity protection design for a PCB, but still I am quite confused about the industry standard/common principles here. The ...
eidetech's user avatar
2 votes
2 answers
94 views

Dual Rail Reverse Protection Circuit for OP AMP inputs

Is there a way to resolve this? When wrong polarities is applied,then I wanted no voltage or current flowing towards the OP Amp. Thanks!!
HuracanWind's user avatar
-3 votes
2 answers
257 views

Symbol for ground vs symbol for a battery [closed]

Could anyone help me to understand if this picture is correct? It is to understand the difference between the symbol of a battery terminals and the symbol of a ground terminal. I would also ...
Daniel Prieto López's user avatar
2 votes
3 answers
421 views

What happens when you get a fault to earth without an MEN link on a 3 phase generator? [closed]

For context, an isolated type single phase generator (no earth stake or neutral-earth link) had a residual current device connected to it and then a fault between active and earth was placed on the ...
SS1's user avatar
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2 votes
2 answers
755 views

How much power in an IC to feel hot

Is there any rule of the thumb at which power dissipated in an IC one should be able to feel that it is hotter than the other components? More specifically, I have a "signal" that should ...
Sandro's user avatar
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1 vote
0 answers
47 views

Old house with no neutral/no ground switches

So, I want to put some small monitor near the door. The only thing I have there is a simple on/off switch of old, with no ground and no neutral. Since this switch is 95% of the time off, the voltage ...
Ronen's user avatar
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1 vote
0 answers
91 views

Pi Pico shorted after working fine

After working for a couple of weeks, a pi pico is just shorted. It is used on a board that gets a midi signal as input and controls six mosfets as output. When powered by usb maximum power is drawn, ...
Nico's user avatar
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1 vote
1 answer
103 views

What is this 2-pin motherboard component and is it broken?

I own a ASUS FX505DT Notebook and the fans stopped spinning so I wanted to check the voltage with a multimeter. I accidentally slipped of one of the terminals and released some "magic smoke" ...
Marvin's user avatar
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2 votes
3 answers
548 views

Isolation transformers and short circuits

For some quick background and info: I'm a relatively fresh (~2y/ experience) EE in the solar field. I work in the R&D department of my company. My country operates in a 230/400V 50Hz grid. We are ...
A.K.'s user avatar
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1 vote
0 answers
177 views

USB 3.0 Debug Cable with a Type-A To Type-C Adapter

I know that the USB 3.0 Debug Cable is just a standard USB 3.0 without the 5V supply line (VBUS). I have a USB 3.0 Debug Cable Type-A to Type-A (in particular this one: USB 3.0 Debug Cable). I need to ...
ABC's user avatar
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9 votes
6 answers
3k views

Are GX ("aviation") connectors unsafe for high voltages?

GX connectors (unofficially called "aviation") are used for a wide variety electrical applications, including supplying power to soldering irons and motors. Usually, the voltages are low, ...
user148298's user avatar
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1 vote
5 answers
142 views

Definition of a short [duplicate]

I know what a short is, or I think I know. Well maybe I don't. If two wires from a power source are crossed - it's a short. If a component is working normally - not a short. If the component however ...
MiNiMe's user avatar
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0 votes
2 answers
100 views

Parallel connection without resistance with series connection with resistance [closed]

Question is simple: Is this a short circuit and why? simulate this circuit – Schematic created using CircuitLab The reason I'm asking is because Falstad circuit simulator marks this circuit ...
Stdugnd4ikbd's user avatar
4 votes
3 answers
399 views

LM311 - all the ones I bought seem to be shorted internally. Am I making a mistake?

This schematic was created for an FSAE prototype car, in order to be used to detect if HV is present. It's called the TSAL (Tractive System Active Light), and I based most of the design from YouTube. ...
BHU1 LORD's user avatar
  • 113
0 votes
1 answer
48 views

Circuit reduction: Voltage across terminals [closed]

I'm new to electrical engineering and there is debate in my class about a problem. We are asked to find the voltage across A and B after reducing the circuit. Circuit is symmetrical. Information given:...
Kamalakshi's user avatar
0 votes
1 answer
56 views

How do two LCD segments get shorted together internally? What can cause that and is there any way to fix it once it happens?

I have a custom segmented LCD I took out of an old device that I'm now driving with an Arduino connected to LCD Driver AY0438. These are old custom displays so I don't have a datasheet or anything, I ...
SherEEf's user avatar
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0 votes
0 answers
100 views

RLC circuit split into two circuits RC & RL after the switch is closed

I have the following circuit (old exam question) that asked to find \$i_{C}(t) \geq 0 ,i_{L}(t) \geq 0 \$ For \$t <0 \$ the switch was open. Therefore the inductor behaves as a short circuit and ...
Homer Jay Simpson's user avatar
0 votes
2 answers
157 views

LED Overcurrent Circuit

I've just started in basic electronics. I was simulating some basic circuits at tinkercad.com and I do not really understand why the LEDs in the two circuits in the pictures below have too much ...
Zachary's user avatar
1 vote
1 answer
156 views

What's the real problem of using both negative and positive grounded equipment at the same rack/location?

It's always recommended not to use negative and positive grounded equipment in the same rack/location, as this connection can cause a short circuit. In this example, both devices have their own ...
edM's user avatar
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0 votes
1 answer
167 views

How a short circuit changes when an inductor becomes short circuit?

I have the following circuit from the book Electric Circuits Nilsson & Riddle chapter 7. The switch in the circuit in picture has been closed for a long time, which means that the inductor behaves ...
Homer Jay Simpson's user avatar
0 votes
1 answer
216 views

STM32F407 Heating up, the decoupling capacitors showing short to ground with multimeter but microcontroller seems working fine

I have an stm32f407 which was running okay for like a month. but now i am seeing that whenever I connect power supply the current consumption is very high and the MCU is heating up a lot. The ...
Mir Hamza's user avatar

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