Questions tagged [spark]

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1 vote
1 answer
678 views

I have a problem with capacitor discharge in an ignition circuit CDI

I have a hard time understanding what the problem in this circuit is, can someone help please? I have a Moped with its capacitor discharge ignition box. It works fine, the spark exist, but I want to ...
1 vote
1 answer
48 views

555 Circuit for Spark Gap Lighter Not Functioning Correctly

I have a circuit designed and fabricated with the following schematic: The specific 555 timer I'm using is a NE555DR. However, when under power the circuit doesn't appear to oscillate and no spark ...
1 vote
2 answers
59 views

Intrinsic safety (IEC60079-11) - assessing spark ignition of RLC circuit, but the L is placed before the zener barrier

My IS circuit contains an inductance, capacitance, and resistance. Shown below is the simplified schematic, with uncountable and countable fault applied, resulting in the most onerous condition: The ...
2 votes
3 answers
107 views

Spark gap alternative

I am building a simple Tesla circuit with a 50-100 kV transformer and capacitors, discharging through a spark gap into the circuit. Is there anything besides a spark gap that would accommodate that ...
0 votes
1 answer
212 views

Spark plug noise on power supply

I am working on a motorcycle diagnostic tool. Everything works fine except for the fact that when the engine is turned on, in some motorcycles spikes start appearing all over the circuit, and the ...
3 votes
2 answers
2k views

Make high voltage spark travel further?

Okay, so I have this piezoelectric barbecue igniter so that I can make a remote igniter. The problem is that if I add a length of wire the spark becomes very small. Is there any way to make the spark ...
0 votes
1 answer
80 views

How does a capacitor coupled voltage transformer (CCVT) and spark gap work?

What is the actual purpose of a capacitor coupled voltage transformer in a substation? What I do know is that they offer low impedance to the very high frequency signal, so it does not get into the ...
4 votes
3 answers
968 views

How small can a spark-gap transmitter be made?

How small can a spark-gap transmitter be made? Wikipedia's got plenty of pictures ranging from "desk-sized" to "room-sized", but those are mostly either early, inefficient ...
6 votes
2 answers
3k views

How can I prevent inrush current from causing sparks when I connect my project to a power source?

It is a common problem with my projects that when I plug connector in (DC connector to DC jack), sparks can be seen, although it hardly takes 10 watts of power. On commercial products, this is not a ...
2 votes
1 answer
1k views

Why would touching a rubber insulated spark plug wire causes current to go through your finger?

I'm trying to understand the physics. The spark plug has a gap of 0.9mm. Why would the current go through the insulation resistance, the finger resistance and the air gap between the finger and the ...
1 vote
1 answer
145 views

Spark gap breakdown voltage vs gap area

I've been trying to design a 1 MV hydrogen gas spark gap. I found the resistance of such to be in the range of 7 Ω/cm, not suitable for a target 40 kA current. Can I make the spark gap shorter without ...
0 votes
1 answer
210 views

Why are SMD components not good for high power applications?

I have been using this capacitive power supply to drive a circuit (an OP amp and relay), but what I can't understand is that when I tried using an SMD resistor (R2) after some testing (turning on and ...
2 votes
2 answers
218 views

Is it ok to connect a 10000 μF Capacitor to a lithium-ion battery directly?

I have a 24 V lithium-ion battery which will pump as Iᵐᵃˣ 40 A and I need to connect a capacitor directly to the 24 V battery which will be 10000 μF(10 mF). The usage of it is to keep the system ...
0 votes
1 answer
70 views

I don't understand this circuit intended for 'Spark Excitation' (for use in spectrophotometry)

I'm buiding a spectrophotometer for elemental analysis of rocks, minerals etc. The optical part of the spectrophotometer is proving quite uneventful but in order to 'see' any elements in the sample ...
1 vote
1 answer
1k views

How to Troubleshoot High Voltage Short/Ground (Furnace Sparking)

11/17 results: Manually turned on heat on the thermostat (you will know what I mean) - lit right up. Thank you all yet again. I have heat...which I will be turning off at night and keeping a fire ...
1 vote
0 answers
111 views

How can I reduce the spark while connecting the battery?

I've been working on a drone that works on a 12S batter (maximum 50.4V.) I am using an Amass XT90 anti spark Connector to connect the battery to the power distribution board (PDB.) The drone has an ...
16 votes
1 answer
5k 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 ...
3 votes
1 answer
2k views

Spark gap minimum breakdown voltage vs air gap

I'm trying to calculate the minimum voltage needed create a spark across 2 electrodes (needle shaped) in open air at normal ambient pressure. Usually, I would use the figure of 3000V /mm as the ...
7 votes
5 answers
2k views

Will a spark gap transmit a signal an FM receiver can "hear?"

Forgive me if this question is a duplicate, I looked around but did not see anything that quite fit. The scenario: I found a box of old FM receivers, the kinds used (I think) for assistive listening ...
8 votes
3 answers
1k views

Voltage required for a spark plug - dielectric constant of air

The dielectric constant of air is approximately 3 kV/mm. The typical space between car spark plugs is between 0.6 and 1.8 mm. By multiplying those numbers in mm by the dielectric constant of air, we ...
2 votes
2 answers
903 views

Stray voltages on home appliances in unearthed electrical system

Using a simple multimeter I have discovered around this home (what I may be mistakenly calling) "stray voltages", i.e voltage potentials across appliances' metallic parts that should not ...
0 votes
3 answers
120 views

Spark between hand and laptop [closed]

When we walk in one of our office rooms, our body gets static electricity. When we touch a metal object such as a window or the body of a laptop, the tips of our fingers spark due to the discharge of ...
7 votes
3 answers
4k views

I have 5 kV available to create a spark. Is limiting the current to 500 µA as simple as putting a 10 MΩ resistor in series?

Haven't worked with high voltage much before, I'm trying to use a spark gap to ionize some gas. I have 5 kV on one side, and a plate attached to ground on the other. The 5 kV will switch on as needed, ...
0 votes
0 answers
200 views

Spark gap Electroboom

I was watching this electroboom video on emp devices and he showed this simple circuit. My question was why is the spark gap in parallel with the coil? I know that the spark gap will act as a HV ...
0 votes
3 answers
545 views

High voltage, high current pulse pulse power supply

How do high voltage high current pulse power supplies work? For example in electrical discharge machining (generating sparks that remove metal,) a single square pulse can be as small as 1 microsecond (...
1 vote
2 answers
1k views

Sparking when using multimeter

I was trying to measure the voltage across two connectors that connect to a 3-pin, 13 A plug as part of troubleshooting, to verify I had circa 230 VAC present. However, when I connected my multimeter ...
2 votes
2 answers
284 views

Arc welding: Why is electric arc preferred over fire for welding?

Is it because arc has a higher temperature and more controllable? Temperature of arc used for welding: 9000°F (5000°C) Fire: 400°F- 9000°F (200°C to 4980 °C) It is difficult to believe a spark ...
-2 votes
1 answer
68 views

Precharging my capacitor manually - looking for feedback [duplicate]

This is my plan, to pre-charge my capacitor of my electric vehicle manually, to prevent sparks occuring when connecting my heavy duty battery. The cables can easily handle 600A as well. Im asking here ...
1 vote
1 answer
528 views

Can I pre-charge a capacitor to prevent a spark when connecting to battery?

I have a heavy duty, 62V, 600A continuous battery which I want to connect to an electric vehicle controller with a 5,2mF capacitor in it. To prevent a massive spark when connecting it, I am thinking ...
1 vote
1 answer
72 views

Spark initiator combined with low-voltage, high-current follow on

I am aiming to add a spark initiator to my electric discharge machining (EDM) circuit, but I am unsure of how combine the high voltage (>1-10 kV) initiator and the existing lower-voltage, higher-...
0 votes
1 answer
169 views

Strange Short Circuit

Can someone explain me how a 60V 5A power supply can generate that super hot arc (second circuit in the video)? I made the video, and no, there's no hack here, I'm just trying to understand what's ...
8 votes
3 answers
2k views

Why did a spark occur between my HDMI cable and metal lamp base?

Edit: Update 1/2/22 @ 2:27 UTC: outlet tester shows that all outlets and power strip outlets being used were normal. Update 1/2/22 @ 21:07 UTC: performed various continuity tests which suggest to me ...
1 vote
0 answers
283 views

How to measure the waveform of a piezo igniter?

Is there a (cheap) way to measure the pulse of commercially available piezoelectric igniters like those used in lighters or BBQ grills? I use them as a cheap (and very crude, for sure) method for ESD ...
1 vote
1 answer
532 views

Reversed universal universal motor sparks and shows arcing even though brushes are completely perpendicular to the commutator

I need to reverse the rotation of the universal motor in question so I swapped the wires leading to the brushes and that successfully reversed the rotation, but now the commutator is arcing and is ...
5 votes
6 answers
1k views

Contact sparking even with flyback diode

I'm building a circuit to measure both voltage and current given to a solenoid valve 24V DC 15W. In parallel to the valve is a voltage divider with 470k + 100k Ohm resistors. In series with the valve ...
0 votes
2 answers
293 views

Why does my old stepper motor generate a spark when connected to 1.5V batteries?

I stripped an old Epson scanner and found a 4 wire stepper motor inside (EM-489 from Minebea.) I decided to play around a little bit with it and measured that one pair of wires has ~2.9 ohms and the ...
0 votes
2 answers
545 views

Electromagnetic radiation from spark gap

I am an electrical college student. I learned from some papers, sites online, including this forum that lightning discharge or any electrical arc emits wideband radio frequency because the odd integer ...
3 votes
2 answers
724 views

Circuit analysis of a spark gap

I am confused about the action of a spark gap. I realize the gap is breached when the voltage reaches a critical point. But what happens to the remainder of the voltage? In the attached circuit the ...
3 votes
1 answer
109 views

Safe measurement of spark voltages on a piezo-electric starter

I'd like to estimate the actual generated spark voltage on a standard home-use piezo-electric lighter used for lighting gas stoves etc. Judging by the maximum spark distance of between 1 - 3 mm ...
0 votes
1 answer
101 views

How to avoid sparks over the load at high voltages?

I built a constant current source: simulate this circuit – Schematic created using CircuitLab When connecting SW1 it use to spark over SW1 contacts because output of OA1 was always clipped to ...
0 votes
0 answers
314 views

Solid state relays with 555 timer for spark plug circuit

So here is the circuit that I have tried to make it work with an ignition coil to make sparks. What I want to achieve is a single spark from the input. This circuit does work but the IC 555 timer ...
5 votes
2 answers
999 views

Ignition coil arc initiation with protected low voltage continuation?

I'd like to initiate a spark plug arc with an ignition coil and then power the resulting (highly conductive) plasma with an ultracapacitor (low voltage, say 12V to 24V, and high current) without ...
1 vote
7 answers
2k views

What is the spark, caused by opening/closing a circuit, dependent on?

I have a DC circuit that runs 1 A current in it when it is closed. When I close the circuit, i notice that there is a spark between the terminals of connection when they're brought close enough, just ...
0 votes
1 answer
113 views

Question on spark gap transmitter circuit

I am trying to understand how basic electromagnetic communication works. From what I understand, spark-gap transmitters were the first wireless devices made by man. A couple of circuits I found online ...
0 votes
1 answer
107 views

Difference between the two circuits

I am trying to make a circuit for controlling a spark plug using 555 IC.I found two circuits on the forum which are very similar to each other but from what I have observed, they are using different ...
1 vote
1 answer
222 views

Protecting capacitor from high voltage impulse spikes

The purpose of the circuit below is to produce an extremely high voltage impulse over the inductor so that I can place a spark gap in parallel to it and create a very large spark. According to ...
1 vote
1 answer
60 views

plug light in without spark? [closed]

I have spotlights which go on 12V/24V distributor but every time I plug one in there is a spark, they still do work fine but it's a bit scary and just annoying when all the other ones flicker every ...
0 votes
1 answer
8k 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 ...
16 votes
3 answers
38k views

How far can mains voltage arc in air?

I wondered this while soldering a mains voltage circuit board and was surprised by how close together the traces were. It has obvious implications in design of electrical plugs, and the proximity of ...
2 votes
2 answers
473 views

I need guidance on designing a 2 kV capacitor charging circuit

I have to design high voltage circuit for the first time in my life. Its purpose is to provide enough voltage to make a spark plug ignite a coal powder mixture. There are some requirements for this ...