Questions tagged [short-circuit]

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

81 questions with no upvoted or accepted answers
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309 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 ...
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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 ...
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1answer
50 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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2answers
258 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)...
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155 views

GaN FET short-circuit protection

From Texas Instruments snoaa15, which is an Application Report about overcurrent protection of GaN FETs, in the first page, you can read the following quote: Traditional approaches using current ...
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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 ...
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111 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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104 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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78 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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93 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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131 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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98 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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1answer
91 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
36 views

SCC for Synchronous Generator Using Matlab

What should I put in ''Three-Phase Programmable Voltage Source'' block ?
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68 views

High Voltage shares ground, Problems?

I am having a problem with identifying why a high voltage part of my circuit broke the low voltage controller. To start, the basic premise of the circuit is to take a very accurate 0-10V DAC voltage(...
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3answers
509 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 ...
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64 views

PMOS Drain-Source Short at Turn-On

In the attached image, without C1 & C2 (used only as de-cap) mounted, when 24V is given at TP1 and nMOS (Q1) is turned ON, the circuit works fine and I get 24 V at TP3. But when C1 & C2 are ...
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1answer
73 views

What would cause a voltage rail to be held low without measuring a short circuit?

I have a circuit that provides power (1.8VD) to an FPGA and some ADCs. I have seen in the past where damage (ESD, EOS, etc) occurs to one of the ADCs. This causes a short from 1.8VD to GND internal to ...
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1answer
99 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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57 views

Noise in opamp amplifiying circuit which can be removed by short-circuiting VDDA and GNDA?

I have built a filtering and amplifying circuit for an ultrasonic receiving channel. The schematic is shown as below. The +3.3V is the power supply of a microcontroller. It amplifies the receiving ...
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88 views

Broken IC UCC28C44?

I'm having some hickups with an providing supply voltage to UCC28C44 PWM controller. I have noticed that when I remove resistor RS7, VDD voltage rises to 18V as I expect. If RS7 is there the voltage ...
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1k views

How to safely create an AC short circuit?

The company I work for builds products that typically have integrated fuses or circuit breakers. During our product validation testing, we would like to begin integrating a test which will basically ...
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6k views

Identifying shorted capacitor on laptop motherboard

Background: My Asus U47A laptop stopped charging or running off the AC adapter. With the help of diagnostic tips on the internet, I found the culprit to be a faulty ceramic cap near the input jack ...
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303 views

Short circuit protection

I have built an AC/AC cuk converter for an assignment I am doing. It works as such, I provide 50V AC in and I get an adjustable voltage out from 0V to 50V AC, depending on the duty cycle of the PWM ...
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140 views

Faulted phase detection

Currently I am studying about short circuit detection on long lines and I can't solve one task: I have line between two substations, and there is short circuit some where on this line. I know current ...
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1answer
85 views

Idea behind Thevenin equivalent circuit

As i know, we find a thevenin equivalent resistance by finding open-circuit voltage and short-circuit current and then divide these two. I have looked on wikipedia and other sources but could not find ...
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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 ...
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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 ...
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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 ...
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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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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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1answer
107 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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55 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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1answer
63 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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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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41 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
59 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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44 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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41 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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102 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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67 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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53 views

ESP32 CAM gpio0 permanently grounded. how to fix?

I bought an ESP32 CAM and flashed it, I connected the UART with example code on the board but always got this: ...
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128 views

Open circuit test and short circuit test

The results I got are close to the required answer, but there is a question asking for drawing the open circuit and short circuit tests characteristics .. I tried to solve it, but Isc and Vt (in open ...
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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. ...
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35 views

Consequences of misalignment connection that grounded power supplies

Having the following mezzanine expansion connector and the related +VSYS_IN part of the schematic What would be the consequences of a misaligned connection that shorted both +5V and +VSYS_IN to GND ...
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1answer
70 views

Where to fuse high voltage batteries connected in series?

I have modules of cells in series each with 48V. I wonder where is the right place to fuse the modules in series. (The current to trip the fuse is the same on every point). Version 1: simulate ...
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68 views

Selecting a value for resistor to make initial capacitor voltage a certain amount

In the above question, I found the amount of R1 to be 31.6k (R1 = 31.6KΩ) and I worked out R2 in this way: 5 * (R1 / (R1 + R2)) * R2 (first calculate the current ...
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70 views

How to limit the current of a short circuit

I will be turning a relay on from my circuit by sending a signal 500ms to 1000ms long, and i am trying to protect against poor wiring or faulty relay from the user that causes a short circuit on the ...
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51 views

Avoiding shorts when switching between bus lines with a mechanical switch

I've designed a circuit to choose between two 8-bit digital buses. I'm taking advantage of the fact that the 74AC540/541 chips have tristate outputs, so can enter into high impedance state to allow ...
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1answer
54 views

Capacitor Shorting in transformer circuit

I built the circuit shown in the link with 240v https://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ It did not work (produceing no spark), as I believe my capacitor was ...