@Jeanna,

I have just been reading through theforum pages and although I have seen this before, I notice no one has picked up on it and replied to it.

Quote from: jeanna on March 24, 2010, 01:16:25 PM
OK
You won't be able to get a joule thief to work with it because a joule thief needs a steady supply not a pulsed one.
thank you,

jeanna

Thats right, the Joule Thief needs a steady supply, so on the output which is pulced, you need to smooth it out, theres a couple of ways to do it.
Solder one or a number of electrolytics accross the output to smooth out the pulces so there is steady DC output.
Use very low values, nothing high, eg 47uf16v then try and feed it to the JT.
Another way is to put another DC cell across the output, it should get charged at the same time it can be sauced as a DC supply.
Or combine both together, caps and battery.


jim

Quote from: Pirate88179 on April 07, 2010, 02:27:04 AM
Jeanna:

Excellent video!

I really like the use of PVC in your device.  Now you have a reed switch running, so, there is no stopping you.

Bill

Thanks, Bill

Yup,
The next thing I want to do is wrap a secondary around it and look at it with the scope.
This will be run by the 1.2v battery and not a self created galvanism, but it will show me what o expect from the secondary.
I can't ever keep my focus on counting turns, or rows, but I think there were at lease 60 turns and 6 to 8 rows on this one I made yesterday. so, it will give me an idea.

@jim,
Hi... nice to see you again!

Thanks for that info.
Sharing good info is always a plus for every one.
Thank you,

jeanna

http://www.youtube.com/watch?v=3tDX85ZK14Q&playnext_from=TL&videos=_7BN2CF9X1c&feature=rec-rn-2r-6-HM

Check out this MIT early wireless telegraph demonstration.  A solenoid within a solenoid and 2 spark gaps powered by 12 volts.  The 2nd spark gap has a spark of about 9" long!  This could easily be related to the NS coil and make/break idea as it was just about in the same time period.

Bill

Quote from: Pirate88179 on April 07, 2010, 03:58:54 PM
http://www.youtube.com/watch?v=3tDX85ZK14Q&playnext_from=TL&videos=_7BN2CF9X1c&feature=rec-rn-2r-6-HM

Check out this MIT early wireless telegraph demonstration.  A solenoid within a solenoid and 2 spark gaps powered by 12 volts.  The 2nd spark gap has a spark of about 9" long!  This could easily be related to the NS coil and make/break idea as it was just about in the same time period.

Bill

Lessee 90,000 volts for each 1.7 inches. .....
---------

I agree.
This is kind of what I was thinking when I said Stubblefield used the inside of that silver globe to catch a brief spark then let it go. I didn't realize then that the spark was unlikely to let go once it connected.

---
I just made a 20T secondary for the coil and got 2.9v in spikes from it. (That's with 1.2v input from the battery.)
I cannot get the frequency on this for some reason. The scope shows the one spike at the left edge of the screen and moving the screen doesn't move the spike, so it is there but I don't know the frequency.

I would like to make this secondary coil connect like a center tap... like a jtc, but since I cannot take any part of it down, this will make it a slow going.

Hopefully I can find a stubblefield that fits near enough to run the motor and switch.

More later!

jeanna

Well, this is too bad, but it does explain some things.

I do not have one stubblefield coil built on soft iron.
Oh maybe one, I will check the plumbing pipe one... later, because it is hollow

Yesterday in order to check if the coil was working the instructions told me to connect a battery to the ends of my coil and see if it picks up a paperclip, then of course, I knew it had to drop it when the battery was away, right?

It was fine yesterday , of course.

I didn't have a paper clip so I used an empty ferrite toroid that was on the table since I know it is attracted to a magnet.
I tested my coils today, and the hardware store bolts held the toroid when the battery was removed, and so did the big spike nails.
In fact the big spike nails didn't need me to use the battery, they just held.
I am reminded of those compass tests I did early on.
Once the stubblefield coil got going it magnetized my cores and they all stayed magnetized!

It is too bad I have all those coils made on the wrong substance, but...I am glad it has been a couple of years.

Back to GO!


jeanna