Joule Thief

[xee2]

Tests with 250 ohm base resistor.

[electricme]

@Xee2
Nice work you have done with your setup.
I like the way you and Jeanna both record your findings.

Today I decided to make another Joule Thief, just a run of the mill one.
This one is black/gray, it has a outside diameter of 53mm Inside diameter is 33mm

I would 9 turns bifilar onto the torid, (wire size is about 1/4mm in size).
Before the winds, I placed some insulation consisting of cello tape, then wound over that.

The LED is a Ultra bright Green one, sorry, don't know anything else about it as it was salvaged.

The Battery is 1.2 NiCad cell.
Transister is a 2n3904 in a plastic case.
Test Resistor "was" a 1000ohms, I replaced this with a 1K pot for tuning purposes.

OK here is a question, how come the green LED is on at NO current draw?
I made a mistake, can you find it?

The LED is not bright, very dim.

At FULL brightness, this circuit draws 150.0+ma and riseing. (edited after mistake was discovered)

photos
0671 = JT working very low light, at NO amps, see meter.
0672 = JT is at full brightness, resistor setting is at 17ohms current drawn 0.14ma
0673 = LED extinguished, but crt drawing 0.26ma

0674 = Closeup of Green LED and Transistor 2n3904
0675 = Torid with Bifilar turns = 9  consisting of red/gold wire varnish.


hooroo
jim

My mistake was, The meter is on mA, the plug from the test leads is in the wrong position.
When I moved the plug to the correct position, the mA rose to 150+mA not 2.2ma as seen on the meter.

 

[electricme]

@all,

What are SERIES wound and PARALLEL wound Toroids?
Is it possible to have a combination of them together?

0676 = All the Torids have been wound in SERIES, huhhhhh?

All turns are over, through then under and do this 6 times for each toroid, dont cut the wire..
then grab toroid No2 and do the same again, then do No3 to toroid No7.

0677 = Several SECONDARIES have now been completed, 25 turns on each toroid. Sorry dont know the wire sizes. Several are seen completed, several to be done.

0678 = ALL Secondaries are now done, whats next? No sleep tonight for me.

jim

[electricme]

@all,

0679 = I have soldered 1 diode onto one leg to each secondary output toroid.
0680 = Each Toroid now has its own 16v 1000uF electrolytic capacitor

Does it have output?           YES, so far.

There is no other circuit driving this part of my design,  (so far, he he,
more coming soon)

Is there voltage? YES there is. 3.53 volts (hand pulsed)

I am driving this set of SERIES torids by a single 1.5v NiCAD battery cell.
I am rapidly tapping the Pos with the positive feed wire to get it working, soon I want to connect the 6Pak to the humble Joule Thief, why?


The JT becomes the "switch" to produce the on - off pulses to drive the 6 pack.

I will need to put another transistor on the bare bones Joule Thief to act as a "current" switch, mabe a 2N3055 in a TO3 case.

[stprue]

@ electrime @ Jeanna

There is really some great work being done by you guys.

Nice pics!