Electronics > Beginners
Help Understanding PNP transistors
AngraMelo:
--- Quote from: ledtester on October 02, 2019, 02:49:48 pm ---Another book I recommend, which you might be able to find online, is "Transistor Circuit Approximations" by Malvino. It has a lot of worked examples which AoE lacks.
--- End quote ---
Just bought for a couple bucks on amazon! awesome!
Zero999:
How much NPN transistor theory do you understand? PNP transistors work in exactly the same way, but with the sign reversed. Indeed, if you build the same circuit but with PNP transistors and reverse the power supply voltage, it will work the same. You can even do all of the calculations with positive signs first and write negative signs next to all of the numbers later.
EDIT:
I've simulated a common emitter amplifier, both with an NPN and PNP transistor. The polarity of the power supply and electrolytic has been reversed in the PNP circuit and the voltages are the same magnitude, but the opposite sign.
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