Questions tagged [short-circuit]

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

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2answers
73 views

Short circuited ferrite bead on PCB

I'm analyzing a circuit (USB game console.) Three identical ferrite beads (805 or 603 package) are used in the circuit. It was working but I tried something on circuit. Now it is not working. I ...
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13 views

What is Inter-Turn ShortCircuit Measurement - Coil function?

I have a multimeter with Inter-Turn ShortCircuit Measurement - Coil function. The result is time value (10^-6 s). Could someone explain how the measurement works and why need a coil test adaptor for ...
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88 views

First PCB (raspberry pi hat)… can't find short circuit

INTRO: Hi there, everyone. I'm working on a RaspberryPi hat PCB that drives 10 solenoids and takes in 5 inputs. I designed the PCB on EasyEDA and had the boards printed at JLCPCB and used their SMT ...
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2answers
275 views

Current limiter circuit is damaging MOSFETs

I have a circuit where a charged capacitor must be discharged over a load resistance. The trigger switch here is a 10A relay so, to avoid damaging it when the load resistance is too low, I decided to ...
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1answer
82 views

Very fast short circuit detection

I am working on a high current MOSFET switch project. I would like to implement short circuit/overcurrent protection, that would be fast enough to prevent MOSFETs from blowing up. In the actual ...
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50 views

how does this circuit protect against short circuit

I am reading the datasheet for the of the P82B96 an i2c extender and the datasheet recommended a circuit that protects the i2c master against short circuit. On Figure 14. I have boxed the circuit ...
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2answers
55 views

Why there is voltage differences in this question and how can I add up resistors to complete voltage?

Can you just explain to me the logic of this question because I am a bit confused here. Why do we have a 120 volt and 30-volt value? My take out is this: there is a current flowing through 120-ohm ...
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48 views

Battery constant current discharge using boost converter

I am trying to run a constant current discharge test on a 12V battery using a boost converter by controlling the MOSFET’s gate input signal with hysteretic control. I’ve attached the circuit diagram ...
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1answer
49 views

Shorting an AC adaptor's output

I was playing around with a 16V output AC adaptor and I unfortunately shorted the output VCC and GND by mistake. A spark occured at the end of the wires. Since then, the output voltage is around 0.3 V....
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1answer
56 views

I have a boost circuit. When the gate is low a short circuit appears

simulate this circuit – Schematic created using CircuitLab I am using a boost circuit as a constant current load, using an IRFZ44 N-channel MOSFET and an IR2104 low side driver taking the signal ...
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1answer
80 views

What happens if we remove the pan from an induction cooker?

When we remove the pan, the circuit will be shorted, right? Why it don't damage the cooker? Even if we use something like an MCB, it should trip something and someone needs to turn it on. Then how is ...
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29 views

Inexplicable curve shape of short circuit current measurement on synchronous machine

I'm doing some experiments on a synchronous machine with follwing data: nominal power: 5kVA nominal stator voltage: 380V phase-phase nominal stator current: 7.6A nominal frequency: 50Hz / nominal ...
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1answer
62 views

How to measure shunt drop with an Arduino

I'm looking at a schematic like the following: simulate this circuit – Schematic created using CircuitLab I understand that this will be a very rough resolution as the drop will be in the 25 to ...
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3answers
63 views

What happens if both sides are forced as inputs on the TXS0108E level shifter?

Consider the case where A is an input and B an output and, by an error, another voltage is applied to B (5V instead of the output 0V with A=0V). B will now be considered as an input because of the ...
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1answer
50 views

Short circuit while measuring

I wanted to measure a LVDS signal across the termination resistor with my oscilloscope. I tried to measure it with DC coupling and AC coupling. Using the AC coupling option led to a short circuit I ...
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2answers
103 views

Circuit that confuse me

Can someone help me with this sort of circuits? I don't see how it works because the circuit isn't closed like this type
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2answers
81 views

How to prevent short circuit between output pins

I am trying to hack some signals coming from an old computer going to a Floppy drive using an ATtiny1614 microcontroller. Normally the computer has full control of the signal lines but at some window ...
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1answer
48 views

Short circuit in DIY brushed DC motor

Recently I've been trying to make a simple brushed DC motor out of copper wire, neodymium magnets, AA battery and some parts that I want to print on 3D printer. I searched on internet how other people ...
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0answers
67 views

RS485 burnt slaves after short-circuit

I have a question regarding a scenario I found myself in, hoping that someone can clarify if the scenario I'm going to illustrate is possible (short premise: I'm a programmer, I'm not an electrician ...
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2answers
87 views

I am building my own distortion pedal but every time I connect it to a 9V power source it does not seem to work?

I am trying to build my own distortion pedal. I initially built this on a breadboard and connected it to a 9V power supply and it seemed to work fine when I connected it to my electric guitar. So I ...
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1answer
47 views

Shortcircuit protection using transistors

I'm designing a short-circuit protection circuit for x2 AA battery (3V) and I'd like some tips from the community on how can I make it a low power mode circuit. When V_out is short cirtcuited, the ...
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39 views

How to wire together DPDT and rocker switch without fear of short circuit?

I am working on desktop monitor raise -system with a 12V 3amp linear actuator (that has dual self locking mechanisms) and would like to use both dpdt switch to let it run up or down freely, and 2-pole ...
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1answer
52 views

Measured voltage is lower than set on bench power supply

I'm trying to identify the issue with my portable monitor. While testing it I noticed a weird (at least for me) thing that I can't understand. I set voltage on my power supply to be exactly 7.2V. When ...
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0answers
62 views

ATmega328P presumably dead after probable SPI short circuit

I am trying to use an ATmega328P to interface an SPI device (RFM95W radio module). This worked pretty well (I could measure the correct signals on SCK, MISO, MOSI and CS), but after some programming ...
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1answer
41 views

Short circuit in Peavey Valve King VK212

This is a follow up question from: Guitar amplifier repair: burnt fuse, capacitor, what else? I continue to work on the same case. In another module I've found a short to ground where the red dot is: ...
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1answer
53 views

Short-Circuit Protection for 3-6 Volts AA batteries

I’m looking for a circuit that can protect 3-6 Volts AA Batteries when a short-circuit happens. When the short-circuit happens, a second circuit (LED blinking) must be triggered and the batteries must ...
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0answers
44 views

Short circuit protection for an analog model train controller

I am developing a circuit for somebody else to control 3 analog DC model trains. I am unsure how I should make the short circuit part. There are more ways to achieve this. My idea is as follows: 1 ...
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0answers
27 views

Dead groups in 18650 li-ion battery - Negative 62Volt between B13 and B14 BMS wires?

I have an 18650 battery pack (12p20s) of which 2 parallel groups (12p) recently "died" (their current voltage is 0V or very close to 0 volt (1 of the groups is 0.0v and the other is 0.09v). ...
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4answers
3k views

Why did this device go bang?

This LED drive module exploded last night, as the result of an earthed (grounded) screw touching a capacitor leg. The breaker (fuse box) tripped, of course, due to earth leakage. That bit makes sense. ...
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38 views

Weird H Bridge measurements: BJTs of Mosfets?

I'm trying to use the H bridge on the main board of a robot whose microcontroller I removed. It is connected to a small motor and contains 4 SMDs named ...
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0answers
53 views

Correct way to build a load lamp setup for circuit testing

I have a 3 way extension lead that I would like to use to stick it in the wall, put a load lamp (40W oven lamp) in series with it, and then use one of the prongs to insert my circuit under test. (the ...
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5answers
100 views

How does higher amperes NOT affect a DC motor for example?

I'm shocked that no one has asked this question on the whole internet. So the question is mindblowing and frustrating. If I have a 12V DC supply with say 500 milliampere, I can for example short ...
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0answers
96 views

What is the benefit of a male output connector on a powersupply?

I saw several power supplies which use a male output connector. For example the Meanwell OWA 90E series uses a XLR 4P or ...
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3answers
99 views

How do I find the effective resistance of a Thevenin circuit if the points are in between resistors

I just started taking classes on circuit analysis. have a question regarding this Thevenin circuit. My end goal is to find the maximum power that can be obtained at A and B. I managed to find the ...
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1answer
86 views

Shunt Burn Issue

I've this schematic, where I'm blinking output bulbs (21W @ 12VDC). Rate of blinking is 85 counts/min. The wave comes to be of 700ms. On time 350ms. In this 350ms of On time, initially I skip 50~100ms ...
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1answer
67 views

Powering the blue pill board from laptop and using another power supply at the same time, will this cause problems?

The components: a laptop, a blue pill board, a +5V power supply(taken from old PC). I have a blue pill board(stm32f103c8t6 mcu). Schematic here. I connect my laptop to the blue pill board via SWD ...
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1answer
84 views

How can electrically short these terminals?

Shorting red + white 1 moves the garage door up and shorting red + white 2 moves the garage door down, I’m using a micro controller but not sure how I can electrically short these terminals.
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46 views

Overvoltage and overcurrent protection to digital signal lines

I'm looking for a technology that protects digital signal lines like SPI, I2C, UART and general purpose I/O against overvoltage and short circuit. That is, protects the microcontroller's digital ...
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1answer
112 views

what is the reason of a Short Circuit? [duplicate]

I am new to electronics, and I don't understand the theory of a Short Circuit. Why does a Short Circuit happen?
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3answers
123 views

24v AC common/ground

I'm trying to understand what I believe to be a basic/fundamental theory, however, I seem to be over analyzing. On many hvac units the 24v or 120v control transformer common is grounded to the unit ...
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1answer
76 views

Handcuffs as protection?

I am not familiar with electronics at all, but as I was strolling through the stack exchange network I've noticed how it is dangerous to electrocute oneself by touching a wire with one hand and ...
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3answers
55 views

Why is my fan circuit with SSRs short circuiting on power down?

I am attempting to build a "smart" ceiling fan for a home automation system I have created and added to over the years. However, this is the first time I've tried controlling a fan motor ...
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0answers
45 views

Starved thermal on GND or starved thermal on power

These errors can make me a short circuit in my PCB which consists of 4 layers (top, power, GND, bottom.)
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1answer
62 views

Short circuit of solenoid's windings

I wanted to short a solenoid, so I just touched the wire of two adjacent loops at a point somewhere in between of solenoid, but now I wanted to know what changes occur in its inductance and ...
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1answer
155 views

Shorting the Output of a voltage regulator

I am using this Buck Converter Input Voltage Range - 8-16V Output Voltage - 5V Load Current - 550mA This 5V is the power supply (Vcc) to the mentioned IC loads : Microcontroller , LED Driver , 2x CAN ...
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1answer
130 views

How to modify TL431 current limiter to work with 80V bus?

I referred following circuit from TL431 datasheet TL431 max voltage at cathode is 36V. since circuit has only a transistor , how to modify this circuit to work with 80V at input(Vi bat). output ...
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3answers
6k views

What is the use of this diode in the circuit?

What is the use of this diode in the circuit? I guess it is used for short circuit protection and turning off the LM2576.
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1answer
90 views

SPDT mechanical relay: do NO and NC pins short between each other as pole switches

I have a mechanical SPDT relay (Digi-Key PN 281-6348-ND, I am only using one of the two channels). I also have a sensitive circuit downstream of the relay. (Image source) While a mechanical relay is ...
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1answer
54 views

Bridging transistors

Title might seems confusing but I want to connect two seperate transistors' outputs - bridging them. Main question: Would there be a short circut if I connect +V(voltage from another transistor ...
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1answer
82 views

A quetion about how an electric shock game works

can someone explain to me why does the current pass through his hands? why doesn't it pass only through the aluminum since electricity always chooses the easiest path? https://www.youtube.com/watch?v=...

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