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13
votes
4answers
842 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 ...
0
votes
0answers
29 views

Waterfall diagram for car starting coil signal/interference

Does anyone have a waterfall diagram for the signal given off by an ignition coil when a car starts (or is operating)?
3
votes
1answer
80 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
448 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 ...
0
votes
1answer
149 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 ...
1
vote
0answers
92 views

Why does ignition coil have polarity markings?

I know about one reasonable answer to this. The electron emission is easier from a hotter surface, which in a spark plug happens to be the central electrode. So we should connect this electrode to be ...
0
votes
1answer
158 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 ...
11
votes
1answer
1k 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
vote
2answers
97 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 ...
1
vote
1answer
219 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 ...
1
vote
1answer
268 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
492 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
99 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
389 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
90 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
575 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
vote
1answer
374 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
164 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 ...