Joule Thief

[gadgetmall]

Hi gang . Good Experiments Everyone . If i might just take a little space here off topic for one sec please . It has come to My attention that Freezer has accused me of Stealing an Image he posted here  in open Source jule thief Forum and that i stole it and posted it on My website . I called it Flaming Me for no good reason and that every picture ,project schematic or anything i post here on open Source is free for anyone to use anyway they wish . Now someone please correct me If i am wrong and also if there is something  here you posted like a schematic or a picture of a neon or something else then please tell me and i wont show your work on My Site . I for one feel privileged that anyone would show My work on another site . I don't steal and hate being accused of it . If you have something you would like me to show the rest of the internet users  on my site then tell me that also .
thank you for your attention
Gnite

Al

[ian middleton]

Bill, Yucca is correct , the 1k is there just to protect the transistor. The JT is not a DC device as such so biasing by the 1k is not an issuse. In the early days we sufferd from thermal runaway in transistors without some form of current limiting resistor. If however the resistor is too high a value, say 10k then it will effect the biasing. Dimmer leds.

All the best,

Ian

[xee2]

deleted

[jeanna]

. i been running it thur a toroid of 3 1/4''
with a 1:1 ratio it will light small bulbs.. but i need more hz's to get the unmodded cfl to light
it just blinks fast and bright.. the schematic below i am using 0.33, 0.2, 0.1, 0.047 uf caps
i'm about to give up..hahaha

Hi kooler,

I have found that increasing the base resistor will also increase the frequency.
The trouble and trick is that this also reduces the voltage.
To remedy that you must make more turns on the secondary from the collector coil.
If you are using an ig coil as the secondary off the collector you probably have the volts to spare especially if you remove one of those neons.

so, for the dynamo that generates the pulses, the bottom line is

higher base resistance = higher frequency
Higher frequency = lower volts
More turns on the secondary = more volts.

All of this is within the limits of the toroid you are using, but that 3 1/2 inch big boy is plenty for this.
It will give you 5khz and over 450 volts for sure

I hope this helps.

@ian,
Well hello!
I am glad you will join us in this fun

Yes, a cigar tube sized crystal battery firing a joule thief is just the right idea!
Well done.

jeanna

[innovation_station]

welcome ian


my materials are only wateing on gold mine ... then they will be shipped then i will build  agin

and see what is the out come .. 

it is kinda of funny i mention triggers  not so long ago ... humm

intresting..

w