Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Robert Francis, Mon Jul 23 2018, 11:02PMWhen I put the ground wire near the marx gen output it will spark to the ground wire but the spark gap in stage 1 does not fire.
Is this a result of having too few stages or could it be my use of inductors instead of resistors?
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Physikfan, Tue Jul 24 2018, 07:48PM
Could you present a picture of your circuit?
Physikfan, Tue Jul 24 2018, 07:48PM
Could you present a picture of your circuit?
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Robert Francis, Wed Jul 25 2018, 06:12PM
Here are two pictures front and back of the marx gen prototype.
Stage 1 arcs about 2x a second but there is no output from the marx gen. When I put a grounded wire tip near the output the marx prototype arcs to ground but there is no firing of stage 1.
Robert Francis, Wed Jul 25 2018, 06:12PM
Here are two pictures front and back of the marx gen prototype.
Stage 1 arcs about 2x a second but there is no output from the marx gen. When I put a grounded wire tip near the output the marx prototype arcs to ground but there is no firing of stage 1.
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
johnf, Wed Jul 25 2018, 07:09PM
so what value are those inductors they do not look anywhere large enough so you are most likely going way past the di/dt rating of those caps which will internally flash over
Show us your calculations
johnf, Wed Jul 25 2018, 07:09PM
so what value are those inductors they do not look anywhere large enough so you are most likely going way past the di/dt rating of those caps which will internally flash over
Show us your calculations
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Robert Francis, Thu Jul 26 2018, 01:37PM
The inductors are 22 uH.
I had to put the caps in the marx, 2 in series to stop them from burning out.
Calculations? I never did any.
How powerful should the inductors be? What formulas do I need to use to calculate that?
Robert Francis, Thu Jul 26 2018, 01:37PM
The inductors are 22 uH.
I had to put the caps in the marx, 2 in series to stop them from burning out.
Calculations? I never did any.
How powerful should the inductors be? What formulas do I need to use to calculate that?
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Electroholic, Fri Jul 27 2018, 02:52PM
Your inductors don't look like they can stand the voltage. In a Marx Generator, the inductors need to pass charge current and then block voltage so the discharge current goes thru the spark gaps.
Most designs use small gauge wire wound single layer on a non conductive coil form.
Think about it, if you need a piece of ceramic a few mm thick to block the voltage, and the voltage can jump that ~5mm airgap, what do you think would happen to a multilayer inductor?
Electroholic, Fri Jul 27 2018, 02:52PM
Your inductors don't look like they can stand the voltage. In a Marx Generator, the inductors need to pass charge current and then block voltage so the discharge current goes thru the spark gaps.
Most designs use small gauge wire wound single layer on a non conductive coil form.
Think about it, if you need a piece of ceramic a few mm thick to block the voltage, and the voltage can jump that ~5mm airgap, what do you think would happen to a multilayer inductor?
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Robert Francis, Fri Jul 27 2018, 05:45PM
Has anyone used inductors in their marx gens and could point me to the ones they used? Or atleast how much uH and ohms they had?
Robert Francis, Fri Jul 27 2018, 05:45PM
Has anyone used inductors in their marx gens and could point me to the ones they used? Or atleast how much uH and ohms they had?
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Robert Francis, Sat Jul 28 2018, 07:16PM
I ordered some inductors 470uH on down, I'll let you guys know how it works out.
Robert Francis, Sat Jul 28 2018, 07:16PM
I ordered some inductors 470uH on down, I'll let you guys know how it works out.
Re: Two stage marx gen - spark gap fires 2x per sec but no output to ground wire
Robert Francis, Thu Aug 23 2018, 05:18PM
Well, the inductors I ordered did not work.
However I tried some 50kV resistors from mouser.com and the 3 stage marx gen prototype was a success.
Robert Francis, Thu Aug 23 2018, 05:18PM
Well, the inductors I ordered did not work.
However I tried some 50kV resistors from mouser.com and the 3 stage marx gen prototype was a success.
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