Questions tagged [short-circuit]

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

Filter by
Sorted by
Tagged with
1
vote
2answers
64 views

Short in MOSFET between Gate and Drain

I try to understand a circuit, where this is a part of: To me this looks like a short between the Drain and Gate in the pmos at the top and nmos at the bottom. The line from the top pmos to the right ...
1
vote
5answers
115 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 ...
-1
votes
1answer
98 views

VCC to ground confusion

I recently reached out for help about uploading Arduino code to a pcb I designed for an LED watch. It was pointed out that I had a couple of errors in my circuit design: “First, R9 should be a pullup ...
0
votes
2answers
89 views

reading potentiometer with external ADC

I am a newbie and my first post. So please excuse my ignorance in advance. My project is to create a handheld readout to read potentiometer(s) (10K linear precision pot) with minimum 10000 steps ...
0
votes
1answer
39 views

USB Current limiting function

I have a little question. This is a USB current limiting function in Orange Pi Schematic. I have tried research it but wonder how does this circuit work since Vcc - Decoupling Capacitor - GND. It's ...
0
votes
1answer
45 views

31-5 kA rating of switchgear

25 kA, 31,5 kA and 40 kA are typical ratings of switchgear with respect to maximum short-circuit current capabilities (typically denoted \$I''_k\$) I can understand 40 and 25 as they are nice numbers -...
0
votes
1answer
50 views

Fast circuit breaker on low side of mosfet driven led circuit

I have some high power CREE COB LED's CXA1304-0000-000C00A20E8, which I turn on for 0.5 ms using a MOSFET on the low side. The signal comes from an optocoupler. I experienced some burned MOSFETs from ...
0
votes
1answer
53 views

74LS14 datasheet question (Short-circuit output current)

the 6th row in the table (Short-circuit output current). When exactly this value is to be considered? (When output shorted to ground? or Vcc?) And does it mean I have to consider this value (i.e using ...
1
vote
3answers
510 views

Transformer and Thevenin Theorem

Consider an ideal transformer connected to a real AC voltage source (with output resistance Rg). Now consider to apply the Thevenin theorem between the output terminals of the secondary circuit. I ...
2
votes
0answers
96 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 ...
0
votes
2answers
43 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: ...
-2
votes
1answer
52 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 ...
0
votes
2answers
57 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 ...
0
votes
1answer
81 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 ...
5
votes
6answers
441 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 ...
0
votes
1answer
288 views

Mosfet testing for short from youtube repair video

In the 23:40 of the youtube video https://youtu.be/YQ7SXJqIpzs , the presenter does a p-channel mosfet test for short, using his bench power supply on the circuit. From what i understood, he ...
1
vote
1answer
79 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 ...
0
votes
2answers
238 views

How to short circuit with using push button

I am testing the ability to charge and recharge battery circuit. I have been testing using a push button in order to short circuit the battery and drain the charge. I would like to instead use an ...
0
votes
0answers
24 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 ...
0
votes
1answer
41 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 ...
1
vote
1answer
83 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 ...
0
votes
0answers
48 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 ...
1
vote
2answers
78 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 ...
0
votes
2answers
221 views

Sychronous generator vs dc generator

I am wondering, if a sychronous generator has a smaller posibility to be burnt (be destroyed permanently) from a short circuit, that has a dc generator with parallel wound or a seperately excited dc ...
0
votes
2answers
718 views

STM32 MCU gets shorted

I've been trying to make a simple audio player using the STM32F302CBT6, however, the VCC and GND pins of the MCU keeps on getting internally shorted when a 3.3V power supply is provided and a faint ...
0
votes
1answer
19 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 ...
0
votes
1answer
26 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 ...
1
vote
2answers
75 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 ...
0
votes
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}...
1
vote
2answers
146 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 ...
1
vote
1answer
172 views

Internal constant current driver for LED short circuits and blows when connected to AC main (120 V) 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-...
0
votes
2answers
794 views

Voltage source Is shorted

I did a circuit to test it using the application everycircuit (https://play.google.com/store/apps/details?id=com.everycircuit.free). But when I did the following circuit I've got the following error ...
2
votes
2answers
260 views

4 - 20 ma current loop, Short circuit isolator

I am trying to design a short circuit isolator, for 4 - 20 ma current loop based intruder alarm system.The below system,identify short circuit in sensing line and sensor activation(closing 1 k in line)...
0
votes
1answer
54 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 ...
0
votes
5answers
138 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 ...
3
votes
4answers
1k views

What is a ground fault?

Is this different to a short circuit and if so then how? Because some circuit breaker protect from both short circuits and ground fault thanks, so when do u need to protect from them and when don’t ...
0
votes
2answers
67 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 ...
0
votes
1answer
71 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 ...
0
votes
1answer
122 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 ...
4
votes
3answers
6k views

Why does grounding my switch cause the fuse to blow?

I'm working on restoring an old ATV, and I'm having a bit of trouble with the wiring. When I got the ATV it was missing the ignition switch, so I decided to replace it with this awesome looking ...
0
votes
1answer
140 views

This Potentiometer Keeps Catching Fire And I Can't Locate The Short

Device: KADA 852 Hotair rework station (not 852D) VR9 keeps catching on fire and R42 is half toasted but still keeping its resistance, I removed and checked CA12 and CA13 and they are not shorted. ...
0
votes
3answers
88 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 ...
0
votes
1answer
43 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 ...
3
votes
0answers
310 views

TP4056 and ST32F103C8T6 shorting after few uses

Complete schematic: Top part: Lower part: This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
0
votes
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 ...
0
votes
1answer
48 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 "...
1
vote
1answer
532 views

How can electronics “short circuit” when you plug in cables

I have recently been troubleshooting a component on a CNC machine. The device is connected via etherCAT to the machines controller. There is also a power cable that goes to the component. Basically ...
0
votes
1answer
305 views

Both sides of a voltage level shifter connected

The TXS 0108E is a level shifter circuit, performing, in my project, a shift level voltage from 3.3V to 5V . Because of a design error in the wiring diagram, I left some pins with the same name on the ...
0
votes
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 ...
0
votes
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 ...

1
2 3 4 5
12