How to safely jump a transistor? Answered
So I want to default the fans in this Xbox 360 I'm fixing to run at a faster speed. Some people just borrow 12 volts from someplace else on the board and wire it directly to the fans. I'd like to avoid this, since A) it seems like kind of a hack job, and B) I'd like the fans to run somewhat less than full bore since it's noisy, maybe 7-9 volts. I've seen some vague mentions of either jumping or grounding transistors to achieve this, but I don't really know that much about transistors to do it safely.
This thread here says that by grounding Pin 1 of the transistor (which is on the far left I believe?) with a resistor, you can change the voltage of the fans safely. So where should I ground to? Or does that simply mean bridge Pin 1 and Pin 4 with a resistor? This guy here just bridged the pin on the far right to the top pin (Pin 3 to Pin 4 I believe) with no resistors involved. Would that method be better? And if so, how could I step down the voltage, just a simple resistor as well?
Also, I've figured out that B, E, and C refer to Base, Emitter, and Collector. But what does that really mean in terms of practical application? And the BCP51 transistor that is used in the Xbox has two pins labelled as "C". I'm confused. Here's the datasheet for the BCP51 for reference.
Anyways, any help is appreciated.