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4hv.org :: Forums :: General Science and Electronics
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solid state marx

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Microwatt
Thu Sept 20 2012, 03:28AM Print
Microwatt Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224
Is it possible to make a solid state marx generator with reversed diodes instead of spark gaps?
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Pinky's Brain
Thu Sept 20 2012, 10:45AM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
No, you need something which switches ...

You can make circuits with lc sections connected by diodes which have some similarities with a Marx. You can use diodes instead of resistors in a Marx to charge it (together with a big inductor).
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Steve Conner
Thu Sept 20 2012, 12:29PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You can also use SIDACs or SCRs in place of spark gaps.
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Microwatt
Thu Sept 20 2012, 02:25PM
Microwatt Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
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Posts: 224
But I have seen marx circuits with transistors in avalanche mode.
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Pinky's Brain
Thu Sept 20 2012, 02:42PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
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Posts: 837
So? Those switch from a high resistance to a low resistance state, a reverse diode will only do that if you're willing to let it fail short.
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Forty
Thu Sept 20 2012, 03:51PM
Forty Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
would a string of tvs diodes work? since they're kind of like a gas discharge tube
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Pinky's Brain
Thu Sept 20 2012, 04:19PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
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Posts: 837
TVS diodes are not crowbar devices, they are clamping devices ... they are not like gas discharge tubes.
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Harry
Thu Sept 20 2012, 05:03PM
Harry Registered Member #4081 Joined: Wed Aug 31 2011, 06:40PM
Location: UK
Posts: 139
I was about to suggest gas discharge tubes, it's not solid state but works with lower voltages, albeit not exactly precisely. Can take one hell of a hit in one pulse though.
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Pinky's Brain
Thu Sept 20 2012, 06:51PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
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Posts: 837
So can simple air gaps, they just make a little more noise.
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Microwatt
Thu Sept 20 2012, 07:46PM
Microwatt Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
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Posts: 224
howabout neon lamps? don't they fire at 50volts?
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