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How do you protect your sensitive equipment from tc interference?

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brandon3055

Thu Jun 21 2012, 03:23AM

Registered Member #4548 Joined: Mon Apr 23 2012, 03:52AM
Location: tasmania
Posts: 271

Hi everyone I'm shore I'm not the only one with this problem I can't seem to find a way to stop my sstc and some if my other HV experiments from interfering with my very expensive mobile phone (hTc sensation) the problem is worst with my sstc if I get within 2.5 metres of the coil it just goes nuts which is problem when I'm trying to take pics or videos and I'm also worried this could damage my phone dose anyone have a solution to this problem? I tried a price of grounded foil on the back of my phone but it had no effect

Any advice would be much appreciated

2Spoons

Thu Jun 21 2012, 03:42AM

Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615

How about simply using a disposable film camera for photos?
What might work is a metal box with open top, and a small hole in the bottom for the camera to look through. If its deep enough you can probably reduce the field strengths sufficiently. Will be a right pain to control the phone, but I can think of any other options. The capacitive touchscreen is likely very sensitive to the kind of fields produced by a tc

brandon3055

Thu Jun 21 2012, 04:02AM

Registered Member #4548 Joined: Mon Apr 23 2012, 03:52AM
Location: tasmania
Posts: 271

i realy like to use my phone becoas it has a widescreen 8MP cemera and HD video recorder and most of all it taks all of two seconds to see the pictur uve taken as oposed to waiting untill uoy get a chance to go and get it developed and then find out it was no good and you needto take another one
how do other people do it?

Mads Barnkob

Thu Jun 21 2012, 08:50AM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

This have to do with many factors, but two large ones come to mind.

1. Your phone is a piece of shit EMC wise, there is little shielding and antennas to pick up interference.

2. The resonant frequency of your Tesla coil and its harmonics might in the same spectres of frequencies used in the phone.

I have never had interference issues even when near as 50 cm with my DSLR, never experienced that my phone crashed while having it in my pocket or my digital scope standing a meter from the coil.

Is you secondary properly grounded?

Kizmo

Thu Jun 21 2012, 11:45AM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

HTC Desire S did not like my SSTC running at 240kHz, touch screen stopped working every time i powered the coil. Reboot by battery removal brought it back to life every time. No permanent harm was done but still annoying if someone happened to call during test runs.

Also both of my my dslrs (Canon 350D and nikon D3100) dont like electric/magnetic fields at all. 350D gives me ERR99 if i go close to running SSTC (1 meter is enough) and D3100 makes vertical lines if i try to take a pic close to (0.5 meters) induction heater work coil which has 1000Amps at 40kHz

So far only thing i have killed with tesla coil is alarm system. That was done by foolishly letting my MOT powered spark gapper to run indoors and throw sparks to walls/ceiling instead of dedicated well grounded strike target.

brandon3055

Thu Jun 21 2012, 03:31PM

Registered Member #4548 Joined: Mon Apr 23 2012, 03:52AM
Location: tasmania
Posts: 271

The primary is earthed to my shed wich is grounded by a metal post in,the ground outside

Kizmo wrote ...

HTC Desire S did not like my SSTC running at 240kHz, touch screen stopped working every time i powered the coil. Reboot by battery removal brought it back to life every time. No permanent harm was done but still annoying if someone happened to call during test runs.

Same thing happens to mine at less then a meter but I don't need to restart it at over a meter the focus goes crazy and the flash terns on and off

PhilGood

Thu Jun 21 2012, 05:29PM

Registered Member #3806 Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259

RIP, I have the same problem ... with the same phone :p

I can't take pics when closer than 1.5m from my VTTC, video works better if I start recording far away from the coil , then it usually keeps working near the coil, sometimes zooming automatically...

Pinky's Brain

Thu Jun 21 2012, 05:51PM

Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837

Make a Faraday cage out of a piece of ITO glass and metal ;)

Steve Conner

Thu Jun 21 2012, 08:28PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

I assume the problem is that the camera is controlled by the touchscreen.

I'd start the phone filming, then stuff it in a metal box with a tiny hole for the lens, before powering up the coil.

Sulaiman

Thu Jun 21 2012, 10:13PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140

I thought the idea was to have the largest radius of interference possible?

P.S. there may be a market for completely electromagnetic-proof shields for 'phones....
ah, I see a problem...

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