Transistor Pnp
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How PNP power transistor amplifies up the current? Then why is it called power transistor?
How PNP power transistor boost up the current, the current is boosted at the cost of voltage? Suppose we use 12V dc as power supply, then if we use power transistor, will it reduce the voltage given to circuit to less than 12V and amplifies the current?
hello MR...
I was just cruising the questions and bumped into yours ...?? I was thinking that a transistor PNP or NPN either cannot boost anything ..In actuality all they can do is allow a lower VA to trigger a path for higher VA's .In doing so they can use very low volt/amps < 1u watt to trigger ...say a 1 watt in turn the 1 watt can trigger a 50 watt and so on until we have darlington paired ourselves into infinity.. So with that in mind and before you apply 12vdc to the E,C or B you might want to take a longer look at how the Pos Neg Pos transistor actually breaks down allowing electron flow..Radio shack has a great book on this and nearly every web site Googled for PNP transistors explained it. Back in the transistor technology day the effect created by sandwiching materials together and getting them to conduct at specific inputs was really voodoo to say the least. The only reason they fell into disfavor was the fact that every step created a gob of heat which we saw as wattage/input and wattage/output. Both of which just ran the bill up ..now adays only the final or possibly a preamp is all a ckt uses that is not totally chip contained...However i have seen a lot of 5 watt regulaters lately and an FET popped up the other day in a small radio i saw. No reasonable world would ever go backwards but if you think about it they(transistors got a man to the moon and back) ..SO....Read on fellow electronics friend maybe you'll be the next guy on the moon 
..If you choose not to go call me I'll take your seat....From the E..
.http://www.tpub.com/neets/book7/25b.htm
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January 28th, 2004 in
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