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2answers
55 views

Circuit to prevent spark from plugging Li-po batteries into motor driver with filtering capacitors

I have a motor driver that handles 2 150watt motors powered by 2 Li-po 12V batteries (connected in series). Obviously, I need filtering caps on my driver so I used 2 1200uF caps connected in parallel. ...
1
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1answer
117 views

Noise from stun-gun based butane torch ignition spark is locking up ATmega328 microcontroller

I have a stun gun (http://www.amazon.com/VIPERTEK-VTS-989-Heavy-Rechargeable-Flashlight/dp/B00FPE6UN2) which I am using to create a large 1/2" electrical arc through the air to remotely ignite a ...
0
votes
1answer
113 views

Why did sparks fly when testing outlet frequency?

I'm using a multimeter (Mastercraft 052-0052-2) and I decided to see if the frequency of an outlet would read 60hz. I switched my multimeter to the FREQ setting and plugged the RED test lead into the ...
3
votes
1answer
64 views

Where to put a spark gap for ESD protection--to an isolated “GND” or to protective earth?

I am designing some PCBs for a system that runs on a fully-isolated DC power supply. I have three power inputs: Protective earth (connected directly to the line earth of a three-pin US 120V AC power ...
2
votes
3answers
167 views

Is an SPDT switch spark-free?

Question Will this switch spark when it is switched? Intro I am currently working on a electric longboard and I came across this problem. I have a LiPo battery providing power to the motor through ...
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2answers
59 views

How do I open a grill ignitor? [closed]

My grill rusted apart, so I decided to salvage the spark circuit. But there's a problem - I can't find the polarity of the ports, and I can't open up the blackbox. http://i.imgur.com/BXqiQjP.jpg How ...
1
vote
1answer
177 views

Spark with 5 volts to solder (weld) tin

I recently visited a factory in China and saw people soldering headphone pins with a soldering device that gave sparks, melting the tin. The soldering iron was hooked up to a device and the pin was ...
3
votes
1answer
433 views

Have I broken my Multimeter?

Firstly, I'll answer my own question by saying that I don't think I have broken it. However, is it possible I could have? (and also possibly, the power supply I was testing). I am quite new to ...
1
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1answer
77 views

Safe use of high voltage in laboratory environment?

I'm completing a project in the lab that requires a spark. As such I've acquired an ignition coil and can use the Lab's standard 12V DC power supply that connects to the 240V AC Mains to power the ...
0
votes
1answer
145 views

How does an electronic shocker works?

I'm new to electronics but I want to make this diagram from "Instructables" : I have everything I need from a camera... I also realized, using a different transformer, that the sparks are made only ...
0
votes
2answers
478 views

Capacitor quenching circuit across Brush and Commutator of DC motor

To reduce the spark between brush and commutator segment there is capacitor and resistor spark quenching circuit is placed between each commutator segments. please find below images for detail idea ...
15
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5answers
2k views

Arduino resetting/hanging due to sparks in ac line

This is the PCB design of the project I have been working on recently (my first pcb design). The idea is to control ac appliances (fans, bulbs etc) without relays. I am using triacs which are ...
3
votes
1answer
194 views

What would it take to spark through electrical tape?

Forgetting for a moment that wires can get hot, and that electrical tape can melt because of it: I've been wondering how much voltage/amperage it would take to spark through your standard house hold ...
2
votes
3answers
3k views

Where do small gas engines get the current for their spark plugs?

While technically not an EE question, until StackExchange adds a regular Engineering section, EE was the closest fit. On small gas engines like those in weed wackers and lawn mowers, where do the ...
1
vote
1answer
276 views

Modeling Capacitive Discharge Ignition (CDI) Circuit

I am trying to model a capacitive discharge circuit (see Fig. 1 below), but I'm having difficulty properly coupling the two inductors on the transformer and also estimating the energy dissipated ...
0
votes
1answer
292 views

Determining Voltage and DC/AC from Wiring Diagram for Spark Door Buzzer

I'm looking to use my Spark Core to control my door buzzer in my apartment. I'd like to identify the correct parts I need to build the required circuit, but this seems to be dependent on the voltage ...
12
votes
1answer
2k views

Why is Ethernet not intrinsically safe?

I understand from a training session that ProfiBUS is considered intrinsically safe, while ProfiNET is not. Some googling indicates that ProfiNET can never be intrinsically safe, because Ethernet can ...
1
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2answers
134 views

What components can be damaged through 10KV ESD?

I'm designing a circuit which has Voltage regulator(IC), current source(IC), resistor, capacitors, LED, reed switch and capacitor. It has to survive 10KV ESD event. My question is: 1) What components ...
3
votes
1answer
655 views

Best practice for Lightning/Surge Protection on PCB

What is best practice/recommendation when I want to protect against lighting/surge? More specfically, my application requires passing the following test: "ANSI/IEEE C62.41---1.2/50 microsecond (uS)...
1
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1answer
587 views

Is this a possible design of Triggered Spark Gap?

I am trying to make a triggered spark gap for discharging capacitors (around 470uF, charged to 300-400V), for entertainment purpose. I have searched for triggered spark gap designs, but I am not sure ...
0
votes
1answer
1k views

Simulating a “spark gap” in PSPICE

The details of this project are too long, so I am not going to bore you guys with them. What I am trying to do is to get the voltage across the right-hand side of the circuit to reach its highest and ...
1
vote
1answer
115 views

Spanning high voltage between capacitors in series

first of all thanks for your time. I've studied a lot before to make this post but theory and real world rarely make a good marriage. I have 20kVAC of spike coming from an ignition coil (the one ...
1
vote
2answers
721 views

How can I create a theatrical spark ejector?

I'm involved with an amateur theatre company (I do lighting, audio etc...) and would like to simulate a switch short-circuiting. I have also done a bit of magic in my time and have used "spark ...
0
votes
1answer
102 views

Reversing car battery's polarities

I had to charge my car battery two days ago. I used another car's battery to do so. I accidentally reversed polarities (+ with -) and vice verse. There were very strong sparks. I was trying to ...
4
votes
2answers
989 views

How to create EMI?

I want to subject my product to large amounts of EMI to see what happens. I figure I need the EMI to be broad-spectrum to be sure it will have the best chance of wreaking havoc. However, I don't ...
1
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2answers
749 views

We want to generate a spark suitable for igniting a potato cannon (alchohol class fuel) preferably without automobile-class coils

I assume we need about 1000v for a 1mm gap. I have a coil about 2cm with an iron core, but no idea how big L is. I have a lot of 330uF capacitors rated for 200v. What would be a clean way of doing ...
1
vote
1answer
225 views

Spark Transmitter with flyback driver and good arcs

I recently built a Fly-back Driver with a fly-back transformer and a primary voltage input of 12 volts and the arcs are about an inch long ( i don't know the exact output voltage because I don't have ...