Joule Thief

[Pirate88179]

Jeanna:

The 10 farad supercap link I posted shows them for $3.54 ea.  That is just a few cents more for a much larger cap.  Plus, IF (sometimes a big if) I remember correctly, they did not have a minimum order or anything.  Shipping was reasonable as well.  I know I paid less than $10 for the 2 caps plus shipping.

Just passing this on. (for whatever it may or may not be worth)

Bill

[sm0ky2]

i got the EB to charge up a cap,
if i sit there and switch the cap in/out of the circuit i can flash the entire array of 19 LEDs for a brief second..

now i just have to get it to stay lit

[innovation_station]

i need input here guys ...

but what if i put a SMALL CAP on the aa supply as soon as power goes in to the 2222 i found 1 

like 1uf this will allow 1uf at 1.5 v to the transistor from the battery in every off and on is that right ...  ??

then if im filling a .33f cap to like 5 v in a min or so or less i have not fully tested it... but could i not let that build up then flick a switch to feed back to the driveing cap at a few volts higher  ??

then i should find a low ohm resistor to put on the base so i dont burn it out

no  ??  honestly i am this electronics stupid lol 

plus i dont want a high resistance as i dont want to change the tune of my coil or limit my tuneing range this coil is running VERRY LOW RESISTANCE...

im just getting ready to solder it all up but i thought i might get a RESPONCE  b4 i do it wrong....

lol

ist!

[jeanna]

Sorry ist. I can't help or even respond.

@Sm0ky2,
Good going.
My guess is that if you got one or 2 of the 10F supers that Bill's site sells, you will be good to go.

@Bill jim etc,
For some reason I am not filling a cap. I filled those supercaps 2 years ago (like the pic 5.5v 1F) but for unknown reasons even though the dmm says just under one volt, the cap isn't filling to even close to it.
The cap seems to be all right.
Earlier today I had the cap in parallel in the battery rail while the jt was showing off. I could charge up the cap for 30 or 40 seconds, and it would run the jt for 40 seconds. But from the start, the moment I removed the battery, the light was dim.

I think we talked about accumulating amps as farads over time , that the cap would fill with volts, but once full, it would stay at the same voltage but keep accumulating farads which would come out as amps , or something like that.

Oh well, tomorrow is another great day.

jeanna

[innovation_station]

i kinda went to work on my own in my mind ...  THIS IS THE IST 9 FEED AND FEEDBACK CHARGER BOARD

this is what i have come up with  for the coil pictured today ...

parts....

1 pot
3 914 switching diodes
1 1uf 50v cap
1 2222 transistor
1 10 ohm 1 watt resistor
1 switch
1 5.5v .33f super cap
1 db107 rectifier 


thats all for now folks... 

IST!