Re: TV vs Hair Dryer ?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>

Hi,

If you have an automatic lawn watering system or some other electronic 
valves in the water system (clothes/dish washer), maybe they were tripped 
on momentarily.  That is all I can think of that could cause this.

Cheers,

         Terry

At 09:53 AM 9/28/2003, you wrote:
>Speaking of water pipes, A while back I was running a coil in the garage, 
>letting the arc strike the metal garage door which is grounded to some 
>nearby water pipes.  About 10 minutes later my wife came out, drying her 
>hair,  and asked what was going on with the water.  She had been taking a 
>shower during the time I was running the coil and noticed surges in the 
>water pressure.  I wondered at the time if these surges could be the 
>result of some sort of magnostrictive effect in the plumbing.  Anyway, I 
>now make it a point to never run a coil when someone is in the 
>shower.  Probably an unjustified fear, but you never know.
>
>Dave
>At 05:18 PM 9/27/03 -0600, you wrote:
>>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
>>
>>Hi Christoph,
>>
>>At 12:09 AM 9/28/2003 +0200, you wrote:
>>>Hello all!
>>>
>>>Today I came around some strange occourances during running my
>>>TC.
>>>I coil indoors, but the room's walls an ceiling are heavyly steel
>>>reinforced and with a good ground and some improvements I had
>>>never problem with the phone / TV / radio or computer running
>>>while the coil was running.
>>>Today I did some short runs and my mother complained that her
>>>hair dryer made strange noises like the TC itself during these
>>>runs when she was using it upstairs in the bathroom.
>>>Has this ever happened before? I feel there is anything bad going
>>>on, but why don't the more sensitive devices like the TV set
>>>react.....might the grounding for the bath mains be interrupted?
>>>I use a Siemens 20A 240V line filter and thought this would be
>>>sufficient.
>>>
>>>Any suggestions?
>>>
>>>regards
>>>
>>>Christoph Bohr
>>
>>I assume the hair dryer is just resistive elements and a common fan.  No 
>>microprocessors or LCD displays...  I note that some capacitors now have 
>>uPs and LCDs :-p
>>
>>First thought is that the coil is dropping the AC line just a little 
>>bit.  Say 2%.  2% does not matter, but you may be able to "hear" that in 
>>something that is AC voltage sensitive like the dryer.  It could be 
>>acting as an audio speaker.  I bet that is it.  No problem at all there.
>>
>>Another thought is that the sound of the coil is traveling around the 
>>house (air vents, tile bathroom walls, and all) along with just getting 
>>out of the shower, with the dryer going...  Just a complex accustical 
>>thing...  Maybe that part of the house has a mechanical resonance at 60 
>>(50) Hz...
>>
>>If you are grounding to the house water pipes...  Hmmm....  Maybe 
>>something there???
>>
>>Cheers,
>>
>>         Terry
>>
>>
>>