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Registered Member #1221
Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196
Hello
Do you folks have trouble with your high voltage experiments activating the TV ?
Here the other day I was amusing myself with my marx generator, it makes alot of noise so I was wearing hearing protection, and when i took it off I heard piano music. To be honest i got rather suprised, so I looked around my room just to find out the TV had been turned on.
I can't seem to figure out what the cause might be, but I'm fairly sure its got something to do with the marx generator because normally my telly doesnt switch on by itself.
Any ideas what it might be? Of course I could just unplug the TV and the problem would be solved, however I'd like to know why it turns on.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I'd suggest that your television and other consumer electronics in your house may be in danger of dielectric-puncture type failures.
Suggested Remedies:
Line borne:
1. Disconnect the Marx from the PSU momentarily before firing by means of a vacuum relay etc.
2. Put a really good filter/spike clipper/spark arrestor in the power supply to the Marx.
3. Connect the Marx to a completely independent Earth so that nothing is shared between the Marx and your domestic house wiring. at the instant of firing.
Radiated:
Put the Marx in a metal cylinder or Faraday cage connected to an independent earth. Penetrate the shielding with ceramic feethrough capacitors where necessary and appropriate - relay control wires, trigger pulse etc.
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
I had a similar issue with my Tesla coil causing enough RFI to cause it to turn the DVD player and TV on and start playing DVDs. A good line filter on the high side of the coil is a good idea, although its a little hard to find one that has a high current rating.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
I like to use independent power sources, like a car battery and an inverter - that depends on what kind of power you are drawing and what kind of spikes you expect to go in reverse through your PSU... I got a 300W 120VAC/12VDC Power Source for about $50 - I have used it for a bunch of different HV stuff just fine, but nonetheless you risk ruining it, but better that than stuff in your house!
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
The most amusing case of interference I had was with my tabletop SGTC next to a musical keyboard! On every breakout, there was also a strange tuneful burst
Registered Member #1221
Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196
I dont supose one of those filters that is found in computer PSU's or monitors fall under the category of "really good filters"? I'm probably not drawing more then a couple amps.
Registered Member #1837
Joined: Tue Dec 02 2008, 02:20PM
Location: NYC
Posts: 65
Maybe an isolation transformer would be best, then you can use it for any project you want to run off the mains. Of course if you find it's rfi you'll have to keep Harry's faraday cage suggestion in mind.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Have you thought about the obvious explanation yet?....Ghosts! :) You can usually pick up 3phase 30A line filters pretty easily and cheaply, this should do nicely.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
When running my 6inch SGTC outside once i set off a car alarm but it didn't stop after one cycle it just kept going for about an hour while I packed up and snuck back inside.
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Sparks turning on the Telly?
