@Bill,

QuoteDid you all notice that I am now getting 19mA from the iron wire to the core?

yaknow bill, I was noticing a potential between the 5 or 6 wires and the bolt indoors also. This is the reasoning behind doing the same thing when the primary got stuck into the ground. The fact that it plummeted only means to me that this is a very active place and we should all be looking here to see what happens.

(Apr 2, the day I checked this the voltage went from 103mvdc to 15 mvdc ) I will record the results of this connection from now on.

I found a hand held digital o-scope for $279. lots but lots less than many others. Is it an OK kind to buy? I really want someone who already owns one to test some coils.

jeanna

@ Jeanna:

Confusing results to be sure.  You gave me an idea the other day when you asked for a clarification on if I were shorting the wires or reading between them.  (I answered I was reading between them)  so, anyway I was a little bored and I started to wonder what would happen if I did short them.  Without using a meter I did not notice anything unusual UNTIL I shorted the iron wire to the core on my larger cell. (This had given me the highest mA readings now)  Well, the iron wire began to get warm...then warmer and then even warmer still!!!  I would not call it hot exactly but way warmer than the copper wire that had been in the same room at the same initial temps.  So now, I am going to hook up some thin copper wire (magnet wire) and bridge between the core and the iron wire to see if it gets hot enough to glow or burn through like a fuse or what ever happens.  The coils were both damp but had not been wet since my tests earlier yesterday.  I know if you short a AA battery like this, the same thing will happen but, it will kill the battery pretty fast also.  After my initial attempt at this, I did test the larger cell and it still showed 18mA from iron wire to the core even though it had just been shorted for a while and was not very wet at all.  I don't know what this means except that these little cells have some power.  I will let you all know how it turns out.

Bill

Quote from: Pirate88179 on April 04, 2008, 05:14:05 PM

QuoteSo now, I am going to hook up some thin copper wire (magnet wire) and bridge between the core and the iron wire to see if it gets hot enough to glow or burn through like a fuse or what ever happens.

Wow, I love it. Or maybe a spark bridging the gap? and then the next question is how many and how frequently and can we tune them?

QuoteThe coils were both damp but had not been wet since my tests earlier yesterday.

It is damp in the air here, but my coils take a full week to dry out bone dry in the inside.

QuoteI know if you short a AA battery like this, the same thing will happen but, it will kill the battery pretty fast also. 

I did check this out with a battery and those truly dry coils of mine, but with more than 1.6 ohm  resistance, the coil doesn't drain the battery very fast.

QuoteAfter my initial attempt at this, I did test the larger cell and it still showed 18mA from iron wire to the core even though it had just been shorted for a while and was not very wet at all.

That is the really exciting part.

QuoteI will let you all know how it turns out.

yes, please.

jeanna

Bill,
You actually did a test I was trying to do but couldn't prove it without a real galvanic coil.

I was using the dry coils I made of tel wire and galvanized steel wire.
Instead of introducing the meter across the 10's I just put a capacitor there. I figured whatever change went on in the 10's could be preserved in the cap.

I had a 2.5v battery connected to the base of the core bolt and the fe 6. There was no voltage that showed up in the cap across the 10's,BUT the bolt got hot

The funny part is I had made this one in the customary way of winding coils - wrap down then straight up. On my one made the way we are making these, it didn't get hot.

so, I wondered and you did it. good going.
I guess to me at the very least it means there is a whole lot of juice going through the system. Again, I will add it is so cool that the coil amps recover right away.

jeanna

I found a hand held digital o-scope for $279. lots but lots less than many others. Is it an OK kind to buy? I really want someone who already owns one to test some coils.

jeanna


@ jeanna

Having a hand held digital O-Scope is OK, for those jobs where a big scope is difficult to be used, and is handy to throw in the car to go to another persons house to compare results.

Does it have a cable that you can hook up to your PC to keep a record of the measurements? some do some dont. If it does, then get it, as the display on the PC will be much bigger. (Check if there was software to drive it also)

I bought another cro, acouple of days ago, when comparing the images, they were the same, but I found the older scope a lot lot easer to read than the new much smaller image.

By all means, get it if you can and if there is no other cro avaliable, did you check out the free software scopes? be careful, some are knobbled to 15 or 30 days, some are only display ones, but there are some that really can do the job.
I have ADHD hence the fast switching and mixing up of topics.

Hoo roo
Jim

BTW, when you short the windings out, and the bolt gets hot, my thinking is it is not electricity you are shorting, but the actual energy stubblfielf accessed, so this tells me that you are on the right track. Might be an idea to get one of those outside temperature sticks (digital thermomiters) that displays outside and inside temperature, put the outside temp thermister onto the top of the bolt with a bit of sticky tape and compair it to the ambient room temp.
Short the cell leads, record the rise in temp every 10 minutes or half hr or so, then when it has peeked, remove the short and see if it returns to normal. Do it all again, to see if it wasnt a fluke reading.