“This article helps you understand what PNP transistors are, how they’re used, and why they’re less common than NPN transistors.
You are probably well aware that modern electrical engineering, and in fact the entire modern world, is inextricably linked to devices known as transistors. These components function as both on/off switches and as amplifiers. Though field-effect transistors currently dominate the electronics scene, the original transistor was a bipolar transistor, and this device was soon followed by the first bipolar junction transistor, or BJT.”