Quote from: Localjoe on May 06, 2008, 12:38:52 PM
@Gary & Jim

Great suggestions.   I took a 4 inch wrapping paper cardboard roll and cut a section down to sizesay twelve inches tall, i then proceded to wind a single layer solonid style coil with the green radio shack magnet wire.  First i can use this as a modular secondary for testing, second i think the group should pull in some more material science knowledge so we can get a small design set to just give new folks to start with.  I really like .. i wanna say it was freezer or another gentelmen here who used the wood end caps like stubblefield did and a long bolt to secure them.   As jim mentioned before a small cordless skrewdriver or corded with a hex head in the chuck for the bolt would work well as a mini lathe for us to wind with.  Anyways i have two questions to throw out there, 1  i dint think ac was suspost to show up unless a load was present in a transformer sense.. that brings me to is my meter acting as a load in a dead short on the secondary winding.  Im thinking yes but i could be wrong.  it would act like a resistive load either way not an inductave one so the readings should hold true but should i put a resistor in line like a 1k ohm or somethign is wahts eating at me?
                                                                                                          Joe

I am not  sure I understand your  question about  AC

I was getting  small AC  reading  on my first coil ......  none on my  pancakes.

I remember reading that  the  secondary ACTED like there was  AC  ,   or something along those lines

My guess is that it is   that it  is probably another  form of electricity


gary

Quote from: resonanceman on May 06, 2008, 12:58:23 PM

Quote from: Localjoe on May 06, 2008, 12:38:52 PM
@Gary & Jim

Great suggestions.   I took a 4 inch wrapping paper cardboard roll and cut a section down to sizesay twelve inches tall, i then proceded to wind a single layer solonid style coil with the green radio shack magnet wire.  First i can use this as a modular secondary for testing, second i think the group should pull in some more material science knowledge so we can get a small design set to just give new folks to start with.  I really like .. i wanna say it was freezer or another gentelmen here who used the wood end caps like stubblefield did and a long bolt to secure them.   As jim mentioned before a small cordless skrewdriver or corded with a hex head in the chuck for the bolt would work well as a mini lathe for us to wind with.  Anyways i have two questions to throw out there, 1  i dint think ac was suspost to show up unless a load was present in a transformer sense.. that brings me to is my meter acting as a load in a dead short on the secondary winding.  Im thinking yes but i could be wrong.  it would act like a resistive load either way not an inductave one so the readings should hold true but should i put a resistor in line like a 1k ohm or somethign is wahts eating at me?
                                                                                                          Joe

I am not  sure I understand your  question about  AC

I was getting  small AC  reading  on my first coil ......  none on my  pancakes.

I remember reading that  the  secondary ACTED like there was  AC  ,   or something along those lines

My guess is that it is   that it  is probably another  form of electricity


gary

\
Im sorry i wasent that clear after re reading it.  Im reffering to my secondary as the green magnet wire spool i wrapped on the tube described above and i just fit that over waht im calling my primary wich is the bimetallic couple of the copper and steel/iron wires woudn side by side on a cloth insulated bolt, my copper is insulated with cloth steel is bare. i was intermittently touching the ends of the terminals 5 and 6 of the copper and steele/iron wire and had my meter connected to the secondary  wire the green magnet stuff on the cardboard i made so no connection between my primary couple and the meter other than in the transformer sense between the secondary and primary coils secondary being single wire primary being bifilar copper and steel. 
                                                                                                                                                                                   Joe
                              

@ Joe:

I know now you are speaking about ac off the secondary...right?  But remember, most of us got "ac" off the primaries alone.  At least, ac readings.  Have we yet settled this as being meter anomalies or is there real ac there?  I sort of remember we did, but then we didn't.  I recall two checks with o'scopes by some folks but I can't recall if we really learned anything from them.  What do you recall?  I get about .8 vdc and about 1.3 ac off the primary alone.  I wish I could tell what this really is, or is not.

Bill

@Bill

My readings are very close to what you have a little less .8 vdc 1.1 vac.  I am reffering to ac on the secondary tho yes in the above example.  I still dont know waht to make of it either but im trying to not let it bother me.  As far as the transfomer function of it the "make and break device" / device of interpositon  just simply makes and breaks the connection so wether were transforming ac or dc i do not know but the end result on the secondary is ac not dc. Thats as far as ive gotten with it. This new secondary accutaly shows higher readings than the cheapo wire i hadbefore and it isnt even tight to the coil body at least an inch away in all directions plus the thickness of the cardboard which isnt much.
                                                                                                     Joe

@bill,
I have an answer (i think) to your question to joe.
  "Have we yet settled this as being meter anomalies or is there real ac there?"

I have just been reading my latest copy of Silicon Chip Magazine and I quote from P 37 SC May 2008,

"Note that the voltage measured across the generator coil will not be anywhere near the voltage that it develops when running.

That's because the multimeter does not respond well to the low-frequency voltage fluctuations that occur when kicking the engine over.

In addition, most multi-meters do not respond to the peak of the waveform but to the average of a sinewave" unquote.


Now this is news to me, I will ring the staff and get some more info about this shortly, bill, this was taken from an article which allows one to build and replace the ignition module on a lawnmower, motorbike etc.
The reason I posted this is mainly because of the middle "quote" line, multimeter does not respond well to the lo-frequency voltage,

Do we need an even more sensitive test instrument? I don't know.

jim