Joule Thief

[jeanna]

good going xenomorphlabs
sort of like bell labs only different... 

@gadget and all,

I made some progress on the tank. Here are some numbers

base resistor 453r
toroid 5+5 bifilar and 50 turns secondary
Variable resistor parallel with cap in line between base resistor and  toroid.

Testing variable resistor and 3 different caps 101pF, 103pF 104pF (I want the one in the middle!)

VR - 1K09r 101pF 25.5mA light bright
                 103pF 25.7mA light bright
                 104pF 26mA    light bright



VR = 5Kr  101pF 12.5mA light not on
                103pF 14 mA light on
                104pF 14.1mA light on

VR= 10K6r  101pF  7.68mA  light on
                  103pF   6.9mA   light on bright
                   104pF  6.4mA   light on less bright


interesting

jeanna

[gadgetmall]

(/quote)@TheNOP
could you please get what lead are for witch coil ?

you will have to de-solder the transfo to read resistance between each pins.
if you could also mesure the wires size too, it would be great.
thanks
(quote/)

what ? Not me Bro i got light 

[xee2]

Another neon JT test using toroid with 10 and 100 turns. This works with base resistor as high as 2500 ohms and only uses 16.1 mA from battery to light the neon. So it seems that using more turns on the collector coil does provide better performance (lights neon with less battery drain).



EDIT:

NOTE: with 1K base resistor the battery drain is 36.8 mA (it was 21 mA with 10&40 turn toroid) so battery drain and output voltage are both increased as collector coil turns are increased. But with more collector turns it is possible to get more output voltage for same battery drain by increasing base resistor value.

[jeanna]

After the rectifier i measure 8.65 VDC in the secondary pickup-coil WHILE the LED in the primary circuit
is brightly lit! A Load might change that, needs to be tested.

xeno-

Check out the amps you are using.

What I found was that the amps are related to the transistor and led in the joule thief circuit itself. When you add lights by using the secondary, there is almost NO extra amperage used.

So, if you take out that light in the jt itself you will save yourself a lot of amps, and be down to just the requirements of the transistor.

That will put you on the same page as a few of us who are now working to get that transistor need down below what is considered normal..

hands in the candy jar, this is.

jeanna

[TheNOP]

@TheNOP
could you please get what lead are for witch coil ?

you will have to de-solder the transfo to read resistance between each pins.
if you could also mesure the wires size too, it would be great.
thanks


what ?

the most important parts of the fuji jt is the transformer and its transistor.

i would like to know how this T1 transfo is winded relative to the schematic in this post
http://www.overunity.com/index.php?topic=6123.msg155334#msg155334

also, the resistance/wire size values would help to build a same ratio toroidal transformer.

the transformer must not be in a circuit for the ohms mesurement to be valide.