Joule Thief

[Artic_Knight]

i won't argue with you.
i already told you what eddy currents is and won't repete myself.

i just did that experiment.
i must not have the right electrodes because it does nothing.
the drop speed of the magnet is not affected.
i connected the resistances to both side of the pipe with alligator clips in different ways.
the only way a have not try is with one connection to the inside of one end to the outside of the other end.
resistances i used were 10, 330 and 2k Ohms

i have even tried to take volts and amps reading and was not getting anything.

but i was kinda expecting those 0 values because droping a magnet in a pipe is the same as an homopolar generator.

Edit.
tables code are screwed in this forum...
see the table here homopolar generator
position 5 in the table.
rotating = movement
disk = the tube
external indicating circuit = pickup brushes

if the tube was a coil of the same length of my tube. the magnet would drop fast when the coil is not connected to anything and drop slower if the coil is shorted or connected to a low value resistor.
what is making the magnet drop slower in that case can not be called eddy current.
a mag field crossing a wire at 90 degres does not create eddy currents.


the magnet drop speed would be different if i was to connect a capacitor to the coil.
can you tell me why ?

you don't really have to answere that question.
i already know the reasons why.

I will be nice and state only the following on this "argument"

call it what ever you want. lenz law, eddy currents or telekinisis it works as stated, if the electricity doesnt flow there is magnetic resistance, if the electricity flows there is no resistance unless resistance is placed in the path of the electric current in the form of curcuits or other. 

for your viewing pleasure here is a youtube link.

http://www.youtube.com/watch?v=JDCgxZ87oNc

[TheNOP]

now you have to consider his application. he is trying to take a cap and when it reaches a certain voltage it will jump a spark gap created of 2 conductors that do not touch. we could use a diode in this same situation for the same purpose and when the diode reaches its breakdown voltage it will allow a jump to the other side. this will happen every time the cap has the higher voltage than what is needed.  frequency is dependent on how often this happens so voltage makes a difference for this application.

you might be forgetting important things.

most diodes only conduct one way.
avalanche breakdown is not destructive but normal diodes will blow up if the voltage go over their reverse voltage rating.

avalanche diodes only allow the overvoltages above its breakdown voltage to pass and are only one way too.
not both way like a spark gap.

transient voltage suppression diodes are like the avalanche diodes but conduct both way.
and like the avalanche diodes it let only the overvoltage go through.

they will not let the cap discharge completly.
if the avalanche diodes/transient voltage suppression diodes are set for 100volts and the capacacitor voltage is 101 volts, you will only have 1 volts at it output.

[Pirate88179]

If I get the chance later, I am going to go for 200 leds on the JT/earth battery set-up.  Wish me luck.

Bill

[Artic_Knight]

you might be forgetting important things.

most diodes only conduct one way.
avalanche breakdown is not destructive but normal diodes will blow up if the voltage go over their reverse voltage rating.

avalanche diodes only allow the overvoltages above its breakdown voltage to pass and are only one way too.
not both way like a spark gap.

transient voltage suppression diodes are like the avalanche diodes but conduct both way.
and like the avalanche diodes it let only the overvoltage go through.

they will not let the cap discharge completly.
if the avalanche diodes/transient voltage suppression diodes are set for 100volts and the capacacitor voltage is 101 volts, you will only have 1 volts at it output.

yes perhaps that was a broad statement as you pointed out there are different diods with different behaviors some lending to the spark gap others would be pointless if used in the same situation.

i believe theres a wiki on diodes that is fairly thorough.  thanks for the correction, dont want anyone blowing diodes for no good reason!

[TheNOP]

http://www.youtube.com/watch?v=JDCgxZ87oNc

do you also have one similar to the experiment you suggested to me ?

i have no problem re-creating the same effect as in this video.
i simply can not tape the eddy current with the way you have suggested me to do.

connecting a capacitor on both side of the tube don't change the speed either.
at least not for me.