Questions tagged [short-circuit]

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

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2
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0answers
94 views

Is shorting two power rails with a capacitor like this OK?

I am using this CAN transceiver which runs on 5 V but, if you provide it with the microcontroller voltage on its VIO pin, then it will automatically apply voltage level correction for the micro. The ...
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2answers
40 views

Protection for arduino on two direction dc motor?

Basically I don't want to use an h bridge, I just want to protect my arduino when changing the direction of the motor. The code i use: ...
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1answer
51 views

Reverse the drain of a Channel - N Mosfet using a P - Channel Mosfet? [closed]

I am working on a school project which consists of converting audio signal into amplified pwm signal with a tda amplifier (raw) not a complete circuit with resistors and capacitors, then converting ...
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1answer
77 views

Complete summary of all protection in a circuit?

this is what I have learned and I wanted to know if you can add more to my current understanding in protection. For short circuit (which applies both to overvoltage and overcurrent): Use a fuse first ...
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6answers
427 views

Why does putting the leads of an ammeter in a receptacle short the outlet?

An ammeter needs to be connected in series with a circuit to test current, which sticking the leads in an outlet does not do? Also, there is no amperage to measure on an outlet with nothing plugged ...
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0answers
27 views

Diagnosing short inside Nintendo Switch [duplicate]

My Nintendo Switch suddenly wouldn't turn on or charge. Nothing on the screen, no reboot/reset trick I have tried worked. I often used a normal USB-C instead of the official charger, which might have ...
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1answer
76 views

Boost converter MOSFET shorting

I apologize in advance if this is a more common sense question - I'm still learning some of the basics and using this project partially to just build my knowledge. I've built this circuit with an ...
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0answers
22 views

Peltier Power supply problem

I am doing a project using a peltier TEC1-12706, however I am stuck on powering up the device. I am using a computer adapter power supply(20V;90W) and I it coupled with a synchronous buck-boost module ...
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1answer
40 views

Selecting proper bypass diodes for solar panel

On my sailing boat we've installed four solar panels (two times Vmp = 17.64V, Voc = 21.6V, Imp = 5.67A, Ioc = 6.07A, Pmax = 100W and two times the same but 75W), which we connect all in parallel, then ...
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1answer
79 views

Icom IC-7100 amateur radio circuit - is this a designed short?

My Icom radio has suffered what appears to be an over voltage fault. It's brand new and it appears as if the DCDC charger/regulator in my car has generously donated extra electrons to the radio and ...
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0answers
46 views

Shorted 18650 Li-Ion Batteries

I accidentally shorted three 18650, 3700 mAh batteries connected in series for about 2 seconds. I measured each cell individually with a voltmeter and they read very close to its original rated ...
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2answers
76 views

Fungus causing my board to shortcircuit?

I have an electric bike, which started to act strange a while back. The switches no longer function properly, possibly because things got moist. During the winter the cover of the bike was shredded by ...
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1answer
16 views

ESP12F (esp8266) every program is running okay but it's warm/hot

I have esp12F that programmed with USB-TTL from arduino IDE The wires setup during program is running USB->ESP12F RX->TX TX->RX 3V3->VCC GND->GND While on GPIOs of ESP12F RST->VCC ...
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1answer
24 views

Is there a way to increase space between connections and ground planes in eagle?

The below picture is a screen shot from eagle. The red shade means gnd. Is there a way to increase the space between where the connection goes and the red, gnd, plane? I'm paranoid I'm going to solder ...
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2answers
64 views

Is this diagram wrong as the congruent circuit?

Given the below diagram. The 2 identities are given. $$ V_{1}=AV_{2}+BI_{2} $$ $$ I_{1}=CV_{2}+DI_{2} $$ $$ A,B,C,D~\text{are constant coefficients.} $$ As \$V_{2}=0~\$ \$V_{1}=BI_{2}\$ \$I_{1}=DI_{2}...
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2answers
74 views

Power supply failing when turned on, but doesn't fail if voltage is slowly applied?

I have a dual output PSU that take 9-36VDC in, and outputs +/-12V. This PSU is powered by my DC bench supply. This PSU is powering 2 amplifiers for signal processing, and a HV supply. The HV supply ...
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2answers
139 views

Solar Cell Photocurrent at Zero Voltage?

Having experience in shaping custom solar cells, a colleague made me question my basic understanding of photovoltaic operation recently. He pointed out that a so-called Short Circuit Current in a ...
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1answer
53 views

The relations of the value of the constant of integration is zero between a DC component

I've been may asking the really easy question. The circuit which was made of the AC source and the coil exists. \$L:=\$self inductance of the coil. \$v(t):=v_0*\sin(\omega t)\$ (The voltage between ...
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5answers
135 views

I like to know the details of how capacitors work?

After all these years I am back to the start position of how capacitors work. I don't know to laugh or to cry. Okay even before that. When I hook up two wires, one on each terminal of a 12V DC ...
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3answers
88 views

One battery slot kills its sitting battery

My kid has a battery-operated toy, it runs on three AAA batteries, connected in serial. Once, the toy suddenly stopped working, but all batteries were good. I decided to disassemble the toy and look ...
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2answers
63 views

Reasons of why the signs of the capacitor of the diagram is correct?

I've written the following diagram. The text book says the following. As the voltage \$V\$ is given between the nodes, it is assumed that the charges \$Q_1,Q_2,Q_3,Q_4,Q_5\$ are charged at each ...
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1answer
70 views

An impossible task? Reverse current/short circuit protection not only for load but also for power supply

This is a magnetic phone charger. It's a USB cable that plugs into a standard 5V phone-type charger. The magnetic "plug" has a (+) center-pin and a (-) round metal as the ground with a ...
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1answer
121 views

Beginner question - could this cause a short circuit? (picture)

Hello! I'm very new to electrical engineering and I wanted to ask a question before I attempted something potentially dumb. One word answers are acceptable here! :) I'm eager to learn so any longer ...
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3answers
84 views

Low resistance current limiting on GPIO pin

I'm trying to find a good solution for protecting the GPIO pin of an ATmega32u4 in short circuit conditions. Normally I would just use a simple resistor but that isn't the best option for this use ...
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1answer
70 views

When is a fuse used in tandem with a breaker/MCB?

I have observed that at the input (supply side) of some electrical units, only MCB is used for overcurrent protection; whereas in other units, a fuse is used as well as MCB at the input side. Why and ...
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1answer
47 views

What does “1 second short circuit protection” mean?

In the datasheet of R1SE DC-DC family I read: Short Circuit Protection (SCP) below 100 mΩ 1 second What does it mean? After 1 second of short-circuit the device will burn? What kind of "...
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1answer
37 views

Is this normal that pin 1 & 2 are shorted with HT1628 led display driver?

I just received from China, components to build my own induction cooker (yeah, I know it's strange but I want to add my own features on it ;-) ) and I'm a little disappointed with the build quality of ...
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1answer
34 views

Sensor Signal Open-Circuit/Short-Circuit Faults — Trigger Shutdown Circuit

I am working on a project where I use the signal from 2 sensors in order to determine whether I want to trigger a timer circuit that then propagates a signal to latch an LED. The sensors give voltage ...
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1answer
33 views

Short Circuit in Allen Bradley Micro850 Output Headers

Unfortunately, I have discovered that the outputs 0 and 1, as indicated by my blue Sharpie marks, have continuity. I have inspected the circuit for hours, and cannot seem to find the source of the ...
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4answers
256 views

STM32F4 custom board design problem

I designed a PCB with STM32F411RE and a couple of sensors. Before and after mounting components on the PCB, I checked the Vcc and GND pins for short circuit and I did not see any problem. I am using ...
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3answers
96 views

Determining current through a short circuit

Edit: So I have to calculate the current through the short circuit and what I thought of is: Applying current divider across 4kohm and then the 2kohm resistor right below to get their respective ...
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2answers
56 views

About voltaic cells and why 2 batteries won't short together

Why 2 batteries won't short like that? If we connect both terminals of the same battery it would short, but not when connecting 2 different ones. How does the battery know when it's connected to ...
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2answers
91 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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0answers
14 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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0answers
108 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
309 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
97 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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0answers
54 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
61 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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1answer
56 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
61 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
82 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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0answers
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
67 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
75 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
107 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
101 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
64 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
90 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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