The construction and terminal voltages for an NPN transistor are shown above. The PNP Transistor has very similar characteristics to their NPN bipolar cousins, except that the polarities or biasing of the current and voltage directions are reversed for any one of the possible three configurations looked at in the first tutorial, Common Base, Common Emitter and Common Collector..Fig 1. NPN Transistor: Fig 1 shows an NPN transistor with the covering the symbol showing the name for each lead. The leads are BASE, COLLECTOR and EMITTER. The transistor shown in the p.o has a metal case with a tiny tag next to the emitter lead..Multiplexing : It is often necessary to interface a number of 7-segment displays to a microcontroller. Rather than use a separate port for each display, all of the displays are connected to the same port and other port pins are used for switching on one display at a time..Telephone History Pages, Antique Telephone Collector's Items from the Telecom Experts at sandman.com.
Related posts to identifying which side of transistor is the collector
For example, in an NPN bipolar transistor, there is a PN junction formed from base to collector, and another PN junction formed from base to emitter. So by testing each "diode candidate", you can determine which pin is the base..
Flat side of transistor Down lo.ng at pins : Emitter Base Collector. Round transistors Emitter up Base down Collector. Always left to right. Transistors with heat sink tabs, tabs are collector Nuff said. No way to tell NPN VS PNP..
Collector C - P type material - Equivalent to anode of the diode; If the multimeter positive probe is connected to anode and negative probe is connected to cathode, then it will show voltage. If the connections are interchanged it will not show any value. With the help of above mentioned steps we can identify NPN and PNP transistor using multimeter..
To identify the pins, keep the front flat side facing you and count the pins as one, two etc. In most NPN transistors it will be 1 Collector , 2 Base and 3 Emitter . Thus CBE. But in PNP transistors, the condition will be just reversed. That is EBC..