Spark made with electronics

[Hero999]

There is some laws against electrical work but they're not that strictly enforced the way gas is.

I think the law in the US is sill, untrained people shouldn't be allowed to work with gas which is obviously much more dangerous than electricity.

 

[Reloadron]

There is some laws against electrical work but they're not that strictly enforced the way gas is.

I think the law in the US is sill, untrained people shouldn't be allowed to work with gas which is obviously much more dangerous than electricity.

Several post back I said this:

I do know the explosive force of one cubic foot (1 cubic foot = 0.0283168466 cubic meters) in a simple enclosed box is ugly.

I saw that test done some years back as a result of what was called a "pressure release". Pressure release my butt, it was a gas explosion that shook the building I was in. I am not totally uncomfortable around gas but I also have the wisdom to leave working with gas to those who know what they are doing.

There is a big difference between a fool working with electricity like mains power who may kill or injure himself and a fool working with natural gas where the explosion can kill a dozen or more people. I don't think the US law is silly more like I think the lack of laws is stupid.

Someday I'll share the story of why the old gas stove (range) we had was replaced.

Ron

 

[SimonTHK]

Hi. If I put two 200v diodes in parallel will it then work as 400v?

Its not really a problems since I have an lN5408 and that goes to 1k voltage, but I want to know.

 

[SimonTHK]

Oh, I forgot to warn you that the switch, resistor and capacitor both need to have a maximum voltage rating of at least 400V and the diode needs to be rated to at least 750V because of the voltage doubler effect.

I was just wondering. When you say 400v it is because you cant get anything at 230v right? it goes from 200v to 400v atleast when we talk diodes. (and I do use a 1kv diode )

 

[SimonTHK]

Hmm all these high voltage komponents. For making a spark I could just use the automotive ignition coil add 12v and get a suitable 312v out to make the spark? And then I dont need these high voltage komponents? Thats only for making big sparks.
312v should be good enough, and I will be able to use a small 16v capacitor and normal resistor and 4001 diode right?

 

[Hero999]

I was just wondering. When you say 400v it is because you cant get anything at 230v right? it goes from 200v to 400v atleast when we talk diodes. (and I do use a 1kv diode )

The peak voltage of a 230VAC sine wave is 325V.
The capacitor will charge to the peak voltage, minus the tiny rectifier loss, not the RMS voltage.

If the mains voltage is 10% high, the RMS voltage will be 253V and the peak will be 358V, add a reasonable safety margin and you get 400V.

If the capacitor is charged to 357V, and the mains voltage reverses, the peak reverse voltage across the diode will be 357V + 358V = 715V, add a reasinable safety margin and you need a 750V rectifier, the 1V difference is due to the rectifier losses and rounding errors in my calculation.

Hmm all these high voltage komponents. For making a spark I could just use the automotive ignition coil add 12v and get a suitable 312v out to make the spark? And then I dont need these high voltage komponents? Thats only for making big sparks.
312v should be good enough, and I will be able to use a small 16v capacitor and normal resistor and 4001 diode right?

312V is no where near high enough to make a spark, as a general rule you need 1.1kV per mm.

312V is actually classed as low voltage, high voltage is over 1kV.

An ignition coil produces a much higher voltage than 1kV, normally 5kV minimum, often higher.

 

[SimonTHK]

thanks. I did read about the 312v some where. But others can make mistakes I also read that automotive ignition coils was often at 30kv

 

[DSGarcia]

In addition to something to shut off the gas if it is not ignited as previously suggested, I would also add an E-Stop (Emergency Stop) switch that can be hit by someone to disable the system and shut off the gas in case there are any problems.