Joule Thief behavior question.

[gyulasun]

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?

I answered your question in my above post.

[Legalizeshemp420]

I answered your question in my above post.

It isn't a Thyristor though and has way better stats than the BC337-25.  The thing is I have done this before and did not achieve these results.  How many can I parallel before diminishing returns sets in?

[xee2]

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?

Normally two transistors are paralleled to generate the equivalent of one transistor that has a lower collector-emitter resistance so that more current will flow through the circuit. As the current is increased in the collector coil the output voltage and power will also increase. However, if the transistors are not well matched, one of the transistors may end up hogging most of the current and thus reducing the benefit of having a second transistor.

[Legalizeshemp420]

Normally two transistors are paralleled to generate the equivalent of one transistor that has a lower collector-emitter resistance so that more current will flow through the circuit. As the current is increased in the collector coil the output voltage and power will also increase. However, if the transistors are not well matched, one of the transistors may end up hogging most of the current and thus reducing the benefit of having a second transistor.

Heyas, Xee

Well, my next question is the Imaginary transistor that is a combination of all of my transistors in parallel how do I determine what its stats are?  I would like to figure out what my stats are and see if a single transistor solution is possible, or close enough.  Is there a formula for figuring out the stats of the iTransistor?

In my recent video I have 5 transistors in parallel and it got brighter and brighter with each one but by #5 it was so small of an improvement that #6 would have been redundant.  Diminishing returns and all of that.

[xee2]

Heyas, Xee

Well, my next question is the Imaginary transistor that is a combination of all of my transistors in parallel how do I determine what its stats are?  I would like to figure out what my stats are and see if a single transistor solution is possible, or close enough.  Is there a formula for figuring out the stats of the iTransistor?

In my recent video I have 5 transistors in parallel and it got brighter and brighter with each one but by #5 it was so small of an improvement that #6 would have been redundant.  Diminishing returns and all of that.

Paralleling transistors is like paralleling resistors. The more you put in parallel, the lower the e effective resistance will be. However, paralleling transistors can be tricky. I recommend only paralleling identical transistors.