Joule Thief

[jadaro2600]

@ Mk1

Is this correct? You are lighting a filament bulb from a pickup coil that is only connected to the bulb and only using a 1.5 volt battery? Amazing.

Interesting; I agree, the filament bulb, does it get warm?

[Mk1]

@ Mk1

Is this correct? You are lighting a filament bulb from a pickup coil that is only connected to the bulb and only using a 1.5 volt battery? Amazing.

Yes the bulb on the right is only connected to the pickup coil.

The one on the left is between the E and C of the transistor , so i guess is like direct to the battery.

Mark

[Pirate88179]

Very nice work Mark!!!

Bill

[electricme]

electricme's
My Hazens Joule Thief.

Glue a 2N3055 upside down on a bit of wood or board
the collector toward you

Glue a 1 K pot upside down on the board, the center
connection contacting the Collector, use a lot of solder.


   |----------------------------------------------------------------
   |                                                                                           \
   |                              |----||---|   c1                                          |
   |             /-- ---\      |             |                                                 |
+|           /_______\___|__/\/\/\__|_____                                         | 
  ---       / |            \    |             |         | R1 & R2                            |
------    |  0        0   |  |--/\/\/\--|  /-----| ------------------------\   |                         
_ |        |  b       /e+|                    |   /--| ----------------------- |--|             
   |-------\------/    /                     |  |   /                                   |   |
   |           \           /                      |   | /                                     \   |
   |             \   0   /                       |    \ \   \ \   \ \    \ \    \ \    \ \   \ \
   |               \ c  /-----------------|
   |                 --                                   above represents Bifilar winds
  LED                |
   |----------\__|__/
                  /        \
                 | P O T |
                  \  R3   /
                    -----

R1 & R2 = 100 ohm resistors= 50ohms in parallel
R3        = 1K ohm POT
C1        = 103 1KV Blue ceramic
T1        = 2N3055 transistor
Toroid   = Grey 27mm outside dia,  15 or 16mm inner dia

Turns
Bifiler = 7
Secondary
Start one end and wind on 80 turns, then keep winding, but go
back from you where you came from with another 80 turns.

I think I have the connections correct on the toroid, if it dosent work swap the ends on one side.

jim

[jeanna]

OK jim,
Sorry, but I cannot get my orientation from the ascii drawing.
I have added what I can from what you have said.
I have no clue where to put those diodes or the extra resistors.
I assume I can erase this led, but I left in case you kept it.

Please give me verbal description of what to add or subtract and where.

jeanna
edit
wait, maybe I can...
OK ready to get corrections.
I do not know where those diodes are supposed to go!!