Joule Thief

[xee2]

@ stprue

new goal.....

get over 1000v on a goldmine!

I predict that you can not get 1000 volts with a 1" diameter toroid. According to my results the following equation seems to provide the relationship between turns and voltage. It says you will need 854 turns to get 1000 volts. I do not think there is room on a 1 inch diameter toroid to put 854 turns. Of course the equation could be wrong, it is just a hypothesis.

[xee2]

@ electricme

Actually I'm thinking about using a evacuated glass tube (dont know how long it should be) which has a electrode at either end, which is in turn wrapped in a coil of wire, then fire a spark through the tube, the spark travelling through the tube opens the aeather channel and the radent energy gets dumped into the coil around the glass tube.

Very interesting test. I hope you do this and post results.

[innovation_station]

@ jim

that thing is intresting ...  is it a form of arc lighting ?

@ xee2 

im trying to get up there in voltage ..  last night i built a new coil ..

just 3 wires...  so far im getting  around 250v on the scope ..

my pickup coil is 120 turns..

just a real simple coil .. 12 turn jt  less than a 1" 7/8 or 3/4 "

so if this is the case i should be able to get 1000v im hopeing

with this style unit ..  ill add a pic of this coil as there all diffrent..

ist

[stprue]

@ stprue

I predict that you can not get 1000 volts with a 1" diameter toroid. According to my results the following equation seems to provide the relationship between turns and voltage. It says you will need 854 turns to get 1000 volts. I do not think there is room on a 1 inch diameter toroid to put 854 turns. Of course the equation could be wrong, it is just a hypothesis.

Don't forget about permeability and flux.  This changes results.  It may not be possible on a 1 inch goldmine but I will try anyways. 

[altrez]

@xee2

I have got over 1000V on my 2.9inch toroid with 300 turns. using a 2n3055 and a pot. 18/18 on the primary. So looking at my results. I aggree with you its going to be very hard to do it on a 1" GM .

-Altrez