Quote from: Pirate88179 on April 03, 2008, 03:10:11 PM
 cu to fe wire=.17 v .99mA
                                                                           fe to core=.55 v  10.6mA

The polarity seemed to reverse since my last tests.  My best readings, as you can see, are now from the iron wire to the core.  This was not true in the earlier tests.  what gives??

Bill

@Bill,
When you say cu to fe wire I am assuming you mean you have the probes on one pair of terminals when you record these numbers and this is that number. - I mean, this is NOT a figure fir shorting the wires is it?

Well, this is the curious stuff of this coil. reversing the polarity seems to be part of what happens.
Iwas seeing reversing of polarity with the compass needle as a galvanometer. I am so glad jim has an oscilloscope. I am going to keep going back to that thrift store until I can find one.

Thanks,

jeanna

Hey Bill, what would happen to the coil if you poked the end of it in the earth (not buried, just an inch or to the bottom of the windings) and touched the cu to the core and the fe to the core?

Quote from: one on April 03, 2008, 04:46:08 AM
Has anyone  tried taking readings of a dry coil?

I have been drying mine out a few days now.

I was checking it to make  sure it was dry       ( 5 & 6 )

No  amps    No  V DC  ...........but the     polarity  indicator  kept flashing .

I switched   to AC   .05 V

I played  with it for a while   trying to  figure out what was causing the reading .

No  matter what I did  I kept  getting  getting readings in the same  range ........from  .05 to  just over .1V

For a while I thought  it was  acting like a hall effect sensor ........ I could  change the  reading  by holding a magnet near it .....  I  could  get a stable  reading   by holding  the    magnet  a set distance  from the   coil ....... but  when I would   leave the  magnet in contact with the coil  and step back  the   readings  would  go back to  the same as no magnet at all .   

Then    I kind of  gave  up .........and put the magnets away .......When  I reached to turn the meter off .......... the readings  jumped  up  exactly as they did when I was holding the magnet.

Then I noticed that   as I step  closer to it ..........the  readings get  higher ...... standing  about 18 in away   it reads  about 
.05 ....... if I lean over it ......the readings start to rise .

If  I  cup my hands and hold  them just  above it I can get a reading   of   .15 V   

If I touch it .......I get a reading of  around   .175 V

I don't think it  is  static charge  because after  touching it   it goes right  back  to the same  numbers  ........and rubbing my foot on the carpet while holding my had  a fixed  distance   from the coil  maintains  a steady  reading .

connecting  caps to  the coil  didn't  change much ........ the caps seem to dampen the effect a little .......but that is all . 

Anyone  have any ideas about  what  I am reading ?


Anyone else  getting similar  readings?



gary

Quote

Gary, I think you saw that a cap didn't help.
Can you be more specific? like numbers?
I think you are seeing some interesting effects.

Jeanna      all the numbers I have are in the quote .
the range is not that much ........ what is getting me is that there  should  not be anything there at all .......but something is  going on ........ 

I  was  at a loss   for  answers  before ............  then a few minutes  ago  I  moved the meter a little and  one of the clips   going to   the copper  winding popped off ....... I  replaced it   ...... it is still  doing the same things ...........but the readings are  about 1/4  what  they were before   the clip came  off .   



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Thanks for posting    the numbers for your  coils .

I can't take  readings that match  yours with this  coil because of the way I made my core.

If  you   have a dry  coil,      can you check    between the   copper and  iron windings  for  AC ? 


If   you get   an  AC  reading   does it  change  as  you  move closer   to or farther  from  your  coil?

thanks     


gary 

Quote from: one on April 03, 2008, 09:46:16 PM
If  you   have a dry  coil,      can you check    between the   copper and  iron windings  for  AC If   you get   an  AC  reading   does it  change  as  you  move closer   to or farther  from  your  coil?

thanks     
gary 

I have 3 coils that cannot get wet because they are made with plastic coated cu wire. without an externally applied voltage from a battery they read nothing anywhere. The resolution on my meter is only to vac and it will say 0.0 vac, but you know that last number is not a number you can count.

My guess is that there is enough moisture in the air that you are getting those very small amounts grom the cloth picking that up..

I live in an area of lots of moisture especially in winter. Removing all possibility of galvanic reaction was one of the reasons I made those coils using telephone wire. My reasoning was that, then I could add a known amount and look at it. the trouble was that I couldn't really add it anywhere that was comparable. maybe. 

Our bodies have electricity running through them all the time. all nerve and muscle actions are electrical and bones are peizoelectric etc... I am sure your body can have a field effect on this and if you can properly read it it could show ambient effects caused by proximity to your body, but I don't know what to do with it either.

anyone else?

maybe jim with his o scope can add to this when he makes a coil.

Joe, don't you have an oscilloscope for your work?

jeanna

Quote from: jeanna on April 03, 2008, 10:15:35 PM


My guess is that there is enough moisture in the air that you are getting those very small amounts grom the cloth picking that up..

I  don't think it is moisture in the coil .........   the  DC readings  from my coil went  to 0  days ago .    (  across 5&6 )


It  does  seem to be reading something  like  body electrical activity .


gary

Jeana

How  big   are your  coils ?

I am guessing that    mine  is bigger .

The  voltages I am getting are small .      with a smaller  coil   they probably  wouldn't  register .

My  coil  weighs   5.2 pounds .........my core  is  almost  a pound of that.
                            ( 2330  Kg  )