Hairpin Project

[resonanceman]

Just wondering  if  anyone  is  planning on building the  solid state spark gap

I am looking into it......


gary

[jeanna]

Hi Gary,
I am not yet able to film this well.
I need to get another fixture from the hardware store, but I want to tell you what I have.

I have a JTC with a secondary that produces so much voltage that I can light a LoA bulb if I put one line of the secondary to the pos at the bottom of the bulb and the other line to the screw part around the edge of the bulb.
Then, there is enough left for an extension of the secondary lines to continue...(in Tesla's drawing it is up the pole a bit)... and an additional bulb will light from the extension of each line to the same 2 places of the second bulb.
They seem to share the voltage but when I use the circuit with 700 volts it lights both somewhat brighter than the one with 450v does.

My next plan is to get a toroid in a circuit that has at least 900v since I think these unmodified bulbs want that.

Ultimately, I would like to see 3 bulbs on one toroid and have a rheostat at the pos battery line to change the input voltage.

So, first to the hardware store, then to make or find another more powerful toroid.. I seem to have bad battery holder karma, so I hope RS has this month's order.
BBS

jeanna

[resonanceman]

Hi Gary,
I am not yet able to film this well.
I need to get another fixture from the hardware store, but I want to tell you what I have.

I have a JTC with a secondary that produces so much voltage that I can light a LoA bulb if I put one line of the secondary to the pos at the bottom of the bulb and the other line to the screw part around the edge of the bulb.
Then, there is enough left for an extension of the secondary lines to continue...(in Tesla's drawing it is up the pole a bit)... and an additional bulb will light from the extension of each line to the same 2 places of the second bulb.
They seem to share the voltage but when I use the circuit with 700 volts it lights both somewhat brighter than the one with 450v does.

My next plan is to get a toroid in a circuit that has at least 900v since I think these unmodified bulbs want that.

Ultimately, I would like to see 3 bulbs on one toroid and have a rheostat at the pos battery line to change the input voltage.

So, first to the hardware store, then to make or find another more powerful toroid.. I seem to have bad battery holder karma, so I hope RS has this month's order.
BBS

jeanna

Jeanna

Sounds  great

What kind  of toroid  is that made with?



I have decided to try a few replications of your Jeanna light

I figure that making a few lights is a good way to practice making stronger JTs

Then  when I am ready I will  use  my strongest  JT for the hairpin.

Before I start building  I a hairpin I want to see what the books I have ordered have to say about it.


I  also want to study that sparkgap
There is a page that describes how it works
havn't had time to  read it yet.



gary

Edit

I did not hear anything more about your conical and the resonance thing
Have  you been able to get the same effect again?
I tried makind a couple conical coils ........ No luck with the resonance
As coreless JTs one of them made 16V

[Mk1]

@all

Check this ...

http://en.wikipedia.org/wiki/Spark-gap_transmitter

Also i found those trigger coils they need to be pulsed at 300v and give out 10000 ...http://www.abra-electronics.com/products/catalog/H-V-Trigger-Transformers-p-4765.html

And if i remember correctly they do make some insulated spark gaps now ,
most likely less noisy ...

[jeanna]

Hi Gary,
First about the conical.
It is just a tricky thing to build, so I put it off.
Without any connection through the toroid there is just what you found.
But, if you connect the free wires the way I did, you get the amazing effect.
First you make a 6 turn secondary. It is not necessary to make it large, and it may be better even smaller than 6.
Then I am assuming you wound the cone with 2 wires all the way and then connect the end of one to the beginning of the other. Now, if you connect the top free wire from the cone to the end of the toroid secondary and measure the total thing, it is a ringing cone.

---
About these circuits.
I have been trying to make the perfect amount of turns in a secondary to light the LoA bulb, and with a TIP31 or TIP3055,  and about 110 turns around a tor-61 from allelectronics which is about .7 inch I get about 600 volts.
This is high and I reduced that to about 84 turns and got 400v.

It was after I made those and they were waiting for a AA battery holder, that you opened this thread.
Once you did that, I thought it might be better to make a high voltage toroid and put 3 in line and use a rheostat to modulate the brightness.
I can also change the base resistor, but at the moment, I will not change either of these circuits.
It is all a part of the experiment of course.
Have you seen Karl Palsness' video where he hangs one light in about the center, then puts another in various spots? The light in the middle always gets some amount dimmer.

From my other experiments earlier this year, I believe that it is possible to add a supporting inductor to each bulb, but that needs experimentation.

I agree with you.
Make a bunch and get the feeling for what to do when you want some effect.
That will inform all of us.

thank you,

jeanna