Joule Thief behavior question.

[Legalizeshemp420]

I just created a simple JT that you see around the net using my own wound bobbin (4t:~40t) using a S8055.  As soon as I put in a BC337 along with the other transitor the LED will get brighter.  It doesn't matter if it is a 20ma or a 700ma one and frankly I forgot what that means.

Anyone re-enlighten me please.

[gyulasun]

I just created a simple JT that you see around the net using my own wound bobbin (4t:~40t) using a S8055.  As soon as I put in a BC337 along with the other transitor the LED will get brighter.  It doesn't matter if it is a 20ma or a 700ma one and frankly I forgot what that means.

Anyone re-enlighten me please.

The S8055 has been an unknown transistor type for me.  If you did not make a typo, my search resulted as it is a thyristor, see here:
http://www.littelfuse.com/products/switching-thyristors/scr/sxx55x/s8055n.aspx   

So what you think?

By the way, if the S8055 is indeed a normal bipolar transistor and you parallel a BC337 with it, then the two work together as an improved transistor for instance with less saturation voltage between collector and emitter, increased Beta (dI_C /dI_B) etc.
And if the S8055 is a thyristor, then the BC337 takes the "role of the boss" for sure   i.e.  mainly the BC337 parameters dominate and the thyristor has a "second hand job".   

[Legalizeshemp420]

Sorry that was a typo I meant S8050 not S8055 and when you go to look up the datasheet they have this part wrong it is a NPN transistor NOT a PNP.

[MileHigh]

For fun, here is a mini treatise on the behaviour of a Joule Thief:

-----------------------------------------------------
MECHANICAL EQUIVALENT CIRCUIT OF A JOULE THIEF

Imagine you go to the gym and you find an old-style exercise bicycle.  The type with a seat and pedals and a chain link to a big flywheel, like a regular bicycle.  There is a friction belt that goes around the circumference of the flywheel.  You set the tension on the friction belt to adjust the difficulty level.

Imagine the belt is completely loose.  You pedal for a few seconds and get the flywheel spinning and then you stop pedaling.  Then you add tension to the belt and the flywheel spins down and stops.  Then you loosen the belt and repeat the whole process all over again.

Even when you are completely exhausted, it's still possible for you to pedal and get the flywheel spinning if you pedal slowly and take your time to build up the speed.  Don't forget that the friction strap is loose when you pedal.

That's a Joule Thief.  You are the battery.  When you are exhausted it's like you are a dead battery.  The flywheel is the coil.  The friction belt is the LED.

The torque that you put on the flywheel from pedaling is the battery voltage.  The torque that the flywheel puts on the belt during the braking is the coil voltage when it's de-energizing.  The rotational speed of the flywheel is the current through the coil.

You pedal for a few seconds and get the flywheel spinning - in the alternate universe the battery did the work required to get current flowing through the coil.  You stop pedaling and engage the brake and the flywheel spins down and heat is produced - in the alternate universe the Joule Thief circuit snaps off and the inductor discharges through the LED and light and heat are produced.

-----------------------------------------------------

MileHigh

[Legalizeshemp420]

So, what does it mean when you add another transistor in parallel with the other one and the LED gets brighter to the naked eye?