Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [spike]

For questions about electrical transients of very short duration (whether voltage, current, etc.), which may cause damage to electronics that are not properly protected. Consider using the "transient" and/or "protection" tag along with this one, if applicable.

Electrical transients of very short duration (whether voltage, current, etc.), which may cause damage to electronics that are not properly protected.

67 questions
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Does switching on a bench power supply cause a voltage spike on its outputs?

In an Adafruit guide, it is claimed that bench power supplies may produce a voltage spike upon turn on: Source I cannot find any reference to this. My assumption is that their target audience (hobbiests) may have low quality bench power supplies,…
Anas Malas
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Coil suppression: Zener + diode: how to minimize the negative voltage?

I have come across these two app notes: Coil Suppression Can Reduce Relay Life Application of Coil Suppression with DC Relays Both of them agree on the fact that a common diode + Zener diode in series is the best solution for spike suppression all…
VoltsAndNuts
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2 answers

EMC emission harmonics

I have a crystal associated with an Ethernet-to-PCIe bridge operating at 25 MHz. I observe spikes at 62.5 MHz and 312.5 MHz. Those harmonics are 2.5 times and 12.5 times the crystal fundamental frequency. My questions: Can the harmonics be 2.5…
user220456
4
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6 answers

Step down converter LM2596 with voltage spike on output when powering up, destroys subsequent circuits

I use this step down converter with input 30V DC and output set to exactly 5V. At the output I connected an ESP8266 (WEMOS D1 mini, has 3.3v regulator on its board) and an MP3 player module (DY-SF5W.) One thing is, I experience sparking on the…
markus germany
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1 answer

How do I size a zener diode for use as a freewheel diode for a ZVS induction heater?

My electronics experience is "hobbyist" and I'm in some new territory with this question, so forgive me if this question turns out to have an easy answer or prove to be dumb. I have a basic ZVS induction heater circuit: It runs on 12VDC and works…
redeyedjim
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Preventing spikes when plugging jacks

I'm using an 8 output DAC (LTC2666) to control synthesizers via mono 3.5mm jack connections. It works fine most of the time but every once in a while, plugging in a jack into the synthesizer will break the DAC in all sorts of random ways, often…
schmop
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How can I get rid of interference between two signals in this timing circuit?

I have designed a small circuit to perform the following functional purpose as illustrated below. The circuit takes a PWM signal as input from a microcontroller and outputs two smaller pulses (ideally between 0.5\$\mu\$s and 10\$\mu\$s) - In…
Blargian
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3
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Oscilloscope alligator clip vs spring noise

I am measuring the the power supply rail provided by a small integrated isolated DC-DC converter taking 5v to 15v. The package looks like as follows: When I measure the output using an oscilloscope probe using an alligator clip for ground I get…
zsky3333
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3
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3 answers

Boost LED driver output spikes

I designed a boost LED driver based on TPS92691. It drives 56V 5A COB LED from 22-50V input. It works ok. Oscilloscope shows small spikes on input (100mV), but large spikes on output (3V). The spikes are from switching (400 kHz). I started with…
Roman Simonyan
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Mitigating FET current spikes in an SMPS buck converter

I'm currently designing an SMPS buck converter that converts 311VDC to 60VDC at 10 Amps maximum load. I'm using ESP32 for the PWM control, and IR2110 for the switching driver. The switch I'm currently using is an NMOS (STW45NM60) that's placed at…
Kevin
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Unwanted spike in the current sink circuit

I designed (with help of several online/offline resources) the following current sink circuit with features: Should be capable of sinking a maximum of 200 mA (AC, RMS). Follows the input sine wave V1 of amplitude 359 V at 60 Hz frequency. POT RV1…
SKGadi
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Microcontroller Power Transient Voltage Spike

First of all thanks for even taking your time to read this question. We are hoping someone can help assist us with an issue we have been having. We are currently working on an automotive tail light design. The issue we seem to be facing is a simple…
jacob80
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Supply turn-on voltage spikes - best practices for protection

The problem I recently had a situation where a board had a destructive fail event from turning on a 53V battery which appeared to have had a voltage spike at least over 80V, most likely well over 100V, because of the damage it caused. I had thought…
KyranF
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555 timer circuit causes spikes on power supply line - how to decouple?

I'm using a 555 timer circuit similar to this one to blink a couple of LEDs at around 1 to 30 Hz: The oscillations are causing huge spikes on the 5V supply line. There is an audio circuit running off the same 5V and the op-amps are picking up those…
one_three_three_seven
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Power line surge on the Active and Neutral line

Since a while, I've been having massive powerline spikes on both the Active and Neutral line. It happens when I turn on a light (with a trafo attached to it), or have an ESD with my floormat, or when the hair dryer is turned on. The power lines…
tim687
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