Joule Thief behavior question.

[Legalizeshemp420]

Ic max is the maximum current the transistor will take before burning up. Just having a transistor with a large Ic max does not mean you are going to magically get that current when you use it. Yes, there is a lot more to it. I think you need to review how transistors work. The collector current is dependent on many variables.

I know there are a lot of things and my question was a simple question "is there anyway to determine what 2 transistors are doing to create the new imaginary third transistor" and I was just told about the collector current which is not what would be what I asked for.  All it would do is allow more current to flow before the transistor would POP/FRY/EXPLODE/BURN UP, etc...

So, I know what the stats on a transistor means I just never played with magically creating a new imaginary transistor with the stats of the 2 I would put together.  That is what my question was about not about adding to the current capacity of the circuit since even one transistor was enough for my purposes but by adding more and more the LED grew brighter.

[xee2]

I know there are a lot of things and my question was a simple question "is there anyway to determine what 2 transistors are doing to create the new imaginary third transistor" and I was just told about the collector current which is not what would be what I asked for.  All it would do is allow more current to flow before the transistor would POP/FRY/EXPLODE/BURN UP, etc...

So, I know what the stats on a transistor means I just never played with magically creating a new imaginary transistor with the stats of the 2 I would put together.  That is what my question was about not about adding to the current capacity of the circuit since even one transistor was enough for my purposes but by adding more and more the LED grew brighter.

If you parallel two identical transistors the result will usually be to double the collector current. If the transistors are not identical there is no easy way to tell what will happen.

[Legalizeshemp420]

If you parallel two identical transistors the result will usually be to double the collector current. If the transistors are not identical there is no easy way to tell what will happen.

That can't be all that happens though can it?  I would think the hfe would be effected as well as the other things not just the current.

In my circuit 175ma is being drained from the a 1.23V battery and giving 48ma to the LED so pretty much any transistor would work but by adding the transistors together the LED grew brighter and brighter to a point of 5 transistors and #6 would have been so small of an improvement you might as well not add it.

[xee2]

That can't be all that happens though can it?  I would think the hfe would be effected as well as the other things not just the current.

In my circuit 175ma is being drained from the a 1.23V battery and giving 48ma to the LED so pretty much any transistor would work but by adding the transistors together the LED grew brighter and brighter to a point of 5 transistors and #6 would have been so small of an improvement you might as well not add it.

No that is not all that is happening. Transistors can get very complicated if you want to understand everything. Perhaps someone else can do a better job of helping you. I do not seem to be making much progress.

[kooler]

That can't be all that happens though can it?  I would think the hfe would be effected as well as the other things not just the current.

In my circuit 175ma is being drained from the a 1.23V battery and giving 48ma to the LED so pretty much any transistor would work but by adding the transistors together the LED grew brighter and brighter to a point of 5 transistors and #6 would have been so small of an improvement you might as well not add it.

I may not be able to help you either but it took me a little over a year to understand semiconductors when it comes to transistors or mosfets when you look at the datasheets for each transistors you also need to look at the graphs  and the gains cause there all different.. at different frequency .. and voltages   so for a example is if you had 3 different transistors paralleled you may have 3 different frequencys running into you coil.. some transistors act different with different wave forms to the base and may draw more or less current ... also your coil inductance plays a big role in how much current passes and how much goes out.. ..  it also helps to see about how much resistance and capacitance the transistor has..   hope I could help some how..


robbie