Joule Thief

[TheNOP]

anyone wondered why a jt that have less coil's turns on the base's coil, seem to get more voltage out at the pickup ?   

Sometimes but in my configuration above i am using a darlington and a cap to resonate this one and a 104 cap on the base makes this one go wild . with 2 50 turn primary jt  and 108 secondary with a bit of Jims idea on the boost output
Gadget

i know what you mean by "sometimes".
those "sometimes" are because of the way jts are made.

once you understand how and why the transistor base is affected, you won't have those "sometimes" anymore.
well..., you will know how to fix it.
there are multiple ways to fix it, a cap is only one way.

my above question is not really a question as you might have guessed.
it is a fact that will always be true.

a current induced in a wire, by a mag field, will always go in the opposite direction to the current creating the mag field.
how is the base's coil winded compaire to the collector coil...

unless your jt coils are done i a way to minimise the "bad" effects on the transistor's base signal,
a diode at the output is not something optionnal.

[gadgetmall]

i know what you mean by "sometimes".
those "sometimes" are because of the way jts are made.

once you understand how and why the transistor base is affected, you won't have those "sometimes" anymore.
well..., you will know how to fix it.
there are multiple ways to fix it, a cap is only one way.

my above question is not really a question as you might have guessed.
it is a fact that will always be true.

a current induced in a wire, by a mag field, will always go in the opposite direction to the current creating the mag field.
how is the base's coil winded compaire to the collector coil...

unless your jt coils are done i a way to minimise the "bad" effects on the transistor's base signal,
a diode at the output is not something optional.

Ok . Well mine should be close to 1 to 1 as i have 100 turns primary and 108 turns secondary .. Its a Mystery why i get Extremely high voltages from this configuration . thanks for the input nop I am not questioning your statement on jt transformer theory  .  . I wish i had a scope . this thing is disrupting Televisions throughout My house and the volts/current  are radiating from the torroid . i could guess the frequency might be very high but i don't know for sure .more test on this toroid . .
Gadget

[xee2]

@ gadgetmall

Will your 1000 volt output light a fluorescent tube? If so, what battery drain is required?

[TheNOP]

Ok . Well mine should be close to 1 to 1 as i have 100 turns primary and 108 turns secondary .. Its a Mystery why i get Extremely high voltages from this configuration .

don't forget the inrush current and/or backemf nature of the voltage being induce in the pickup.

edit:
the ratio is not ~1:1, the coil are 50 turns each from what you have said, not 100 each.
remember the primaries are cw vs ccw.
one of the coils will induce current in the pickup without the transistor's base signal being affected.
the other coil will affect the transistor's base signal.

all depend in what direction you allow the current to flow in the pickup coil.

if you use the mk series ways to make your jt, both coils are affecting the pickup while minimising a "bad" sides effect on the transistor's base signal.

[gadgetmall]

@ gadgetmall

Will your 1000 volt output light a fluorescent tube?

yep and with one wire . I'll picture it in a bit after lunch .!! I bet it will light several in series . Edit . Still eating and playin  . Here is a picture of the only two big cfls i have the ring is lit with one terminal . Its kind of hard to see because of the brightness of the spiral . also there is a neon lit too .
gadget