Joule Thief

[Artic_Knight]

Hi everybody,

I think Gary really hit on something yesterday.

He said "loosely coupled" and "interlaced with the primary". If he didn't say those exact 2 things, I heard them that way.

So, today I tried to put 2 pickup coils together to add to the effect (inspired by jim's success yesterday)  and DARN! the same thing that always happens did again. The voltage either stayed the same or went down. I did NOT get the effect Jim got at all.

I am trying to work out the deal with the high flux toroid here, so when it went completely out, I wasn't so terribly surprised.

I am also using one of my new germanium transistors from gadget. Man, that is sweet. It just takes so little to turn on it makes a really big difference.

I will switch back to a 2N3904 in a while, I just needed to help this high fluxer along. I also have to have a 103k cap in there too. ---This is a stubborn little toroid!

So,I suddenly remembered what Gary said and what it made me think.

I have some toroids which work.
They work really well in almost all conditions.
They are all on the little tiny tor-23 or the filter.

What the tor-23 ones have in many cases like the berry or xtree or zebra with Kynar, is that the way I wound the pickup is I wound 3-4 turns all in a bunch in between each turn of the primary.

I did this now,

Comparing 2 wires that total 14 turns made to connect in parallel,  with one wire of 14 turns made by bunching the turns together, the difference is that by bunching them every single turn adds to the previous one.
None diminish the total.

With every turn the frequency goes down a little bit and the voltage goes up a little bit.

So, in this case... neatness does NOT win. 

I do not think it is a neat thing.
I think it is what Gary said... loosely coupled and bunched together instead of very neatly packed together.

Perhaps the bunch is like a multistranded thicker wire for just that place??

Anyway the results are good. Maybe you (everybody) should try this with a dozen turns and compare them to 6 plus 6. I think the dozen will win if you bunch or group 3 turns in between a pair of primary turns. Do it and lets talk about our results??

jeanna

jenna when you say pickup are you referring to the 3rd coil? or are you using a 2 coil system here?

[Artic_Knight]

jenna i dont know how accurate this thing is and i dont know what all this means yet but i found a wicked setting. check this and make sure you have the inductor and cap showing on the chart.
2.5v  0ohm  750uf  75uh

[gadgetmall]

**deleted**

[gadgetmall]

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Sorry for triple post . i had Connection Database Error

Gadget

[gadgetmall]

Today I spent  some time putting together a board  to run  a 3055

in general  it  lit  up  my LED array  much  better than  a 2222
I  am not sure about how much current it was drawing  ......I could not  get it to work  with a meter  set up in the loop
I  switched    the meter I have been reading    battery  current with for a month now .........and  couldn;t  get it  to light  with the meter hooked up .'

I  tried another meter ........same thing . 


With my  clamp meter it read  1.40 A   but  I  don;t think the clamp  is accurate

I remember  someone  saying  that   sometimes  neon lights  are used to protect the base of these  transistors . ......I took that to mean they could stand pretty high  voltages .
I tried my  18 V battery and   saw  smoke .
I fried something .....

I can't  get it to work now ......maybe tomorow  I  will  find  what  smoked.


Can someone explain  what to look for  on the data sheets   to find the min  and max  that  the  base can  take ?


thnaks

gary

Put a 1 ohm resistor in series with your battery then read across it

@all . you do not need to put your amp meter in series with a circuit . Put a one ohm resistor in your circuit and then you can read across it for your current draw . same goes for the output circuit . put a one ohm resistor in series with your Load and you can get an idea of the power  out .
BASE Emmiter VOLTAGE is 7 volts max on 2n3055
the input voltage is collector emmiter Is maximum 60 volts
so 60 volts is the max  input .
Minium is .7 volts . i am running one now at 0.735 volts

ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
NPN 2N3055
PNP MJ2955
VCBO Collector-Base Voltage (IE = 0) 100 V
VCER Collector-Emitter Voltage (RBE £  100W) 70 V
VCEO Collector-Emitter Voltage (IB = 0) 60 V
VEBO Emitter-Base Voltage (IC = 0) 7 V
IC Collector Current 15 A
IB Base Current 7 A
Ptot Total Dissipation at Tc £ 25 oC 115 W
Tstg Storage Temperature -65 to 200 oC
Tj Max. Operating Junction Temperature 200 oC
For PNP types voltage and current values are negative.
1/4

Just playing with this mobius rod Jt . its been running over a week contiunious.. not to broght right now but still producing light . 5 20kmcds one 100kmcd and one tophat115kmcds . i use a 100 k resistor on the base and a 104 cap to get this sucker oscillation . the mobius has about*edit* 55 knots and then i wound a single 25 turns over that on an old radio ferite barium rod and run this as a normal jt
Edit . i was wrong the volts can go as low as .5 . i shorted the battery just to see and its .598 and still lights . the last pictur is a recharged 1.3 volts full power . i am starting the test over at 9 days of running
Gadget