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Re: EMI Filters



Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Claude, all,

I haven't had too much trouble with my computer from firing a big coil
as of lately with my HP Pavilion a450n. My latest coil project is large
enough that I am forced to pull it out in the driveway to fire it off.  It
stands over 7 ft. tall with the 12x56 toroid in place so  it obviously can
not be fire in a garage with standard 8 ft. celings! I DO however, have
trouble with it messing up my Brinks home security system, so much to
the point that I have to turn it off to fire the coil at all. It also screws up
my hardwired fire alarm/smoke detecor system (house built in 2002)
while running and it did "smoke" the circuit board of my garage door
opener box  :^(((  I will probably end up replacing the whole assem-
bly with a complete new one as replacement of the circuit board will
cost over half as much as a complete upgraded system with installa-
tion. My old opener box only has a 1/3 HP motor and the door re-
pairman said that I really needed a 1/2 HP motor to lift a double ga-
rage door. And this damage to the garage door opener was done
with the coil firing outside in the driveway although I probably had
the coil sitting too close to the house as some of the sparks were hit-
ting the egde of the raised bottom edge of the garage door.

David Rieben


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> To: <tesla@xxxxxxxxxx> Sent: Saturday, May 07, 2005 12:01 AM Subject: Re: EMI Filters


Original poster: "claudio masetto" <claudmas@xxxxxxxxxxxxxxx>

Hi Paul,
I would disconnect the computer equipment when running the coil just in case. When I run my coil in the garage under the house my messages on the answering machine and the stored numbers on the phone which are both in the house above are erased.


Claude.
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, May 07, 2005 6:38 AM
Subject: Re: EMI Filters


Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Karl,
I'm, sorry, my hands were typing before my mind was functioning! The EMI filter is wired between the variac output and the coil driver. The volt meter is "behind" the EMI filter along with my house wiring. Now I'm concerned about running my Tesla Coil from my house supply as I have a ton of sensitive computer equipment in the house. I do have a separate RF ground outside. It is an 8 ft. ground rod in the ground just outside of the garage. I have another 20A EMI filter and I think I will wire it in between the wall outlet and the variac so that I have 2 EMI filters with the variac in between them.
Paul
Think Positive


----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Friday, May 06, 2005 2:18 PM
Subject: Re: EMI Filters

> Original poster: Karl Lindheimer
<<mailto:karl@xxxxxxxxxxxxxxx>karl@xxxxxxxxxxxxxxx>
>
> Hi Paul,
>
> If I understand correctly, you state that the EMI filter is between the
> wall outlet and the variac? If that is the case, the filter will only
> reduce any back EMI from reaching the wall outlet and the rest of the
> connected house wiring on the same circuit. The variac and meter are >
still
> exposed to the EMI from the coil. My flyback transformer experiments >
also
> created huge RF/EMI necessitating that I disconnect any >
valuable/sensitive
> equipment from the AC line. I ended up building a robust simple power
> supply to spare my lab grade bench supply.
>
> Karl
>
> On May 5, 2005, at 1:20 PM, Tesla list wrote:
>
>>I have a 20A EMI filter wired in reverse between the wall outlet and my
>>variac. I have a volt meter attached to the variac outlet.
>>
>>I was driving one of my ignition coils with a 600 watt dimmer in series
>>with a 2mF cap. As I powered up the variac, I could read the voltage
>>increasing on the volt meter all the way up to 120V. When I turned up >> >>the
>>dimmer, the voltage indication on the volt meter went haywire when the
>>coil began sparking. If I drew the ground away from the HV output, the
>>volt meter would stabilize as soon as the sparks stopped.
>>
>>What have I missed here? This isn't normal, is it??!! Could the
EMI >>filter
>>be bad?
>>Paul
>>Think Positive
>
>
>