![]() ![]() 2N3904 has a gain value of 300 this value determines the amplification capacity of the transistor. Posted about my SAB listing a few weeks ago about not showing up in search only when you entered the exact name. It is not a true resistance since it is not constant but, instead, varies with the operating point of the transistor as can be seen by the formula. 2N3904 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. We call \$r_o\$ the collector-emitter dynamic, or differential or small-signal resistance. In other configuration does collector-emitter have resistance as well? of three different ways Common Base, Common Emitter and Common Collector. (a) npn transistor, (b) pnp transistor B E C Base-Emitter junction Base-Collector junction Base-Collector junction Base-Emitter junction B E. C C BB EE n n p (a) npn transistor C C BB EE n p p (b) pnp transistor Figure 1. ie with most positive negative (usually black) meter lead on the base the other two leads wil show a conducting diode when the positive lead is placed on them OK - now you know NPN from PNP and which is base. In other words, to make voltage drop between collector and emitter there must be something act like resistor between them, right? If no, what make the difference in voltage? Electronics Tutorial about the Bipolar NPN Transistor and the Transistor as. The three terminals of the BJT are called the Base (B), the Collector (C) and the Emitter (E). With a PNP transistor the base will have two diodes facing towards it. Is there something act like varying resistor between collector and emitter to make that. So, there must be something that wastes the energy to make Ve=0 that cause voltage drop between collector and emitter. Suppose that there is not thing between Emitter and Ground that make Ve = 0 and Vb = 0.6-0.7 while Vc is much larger (that depend on load resistor). ![]() Now, what I concern is the Voltage Drop between Vcc and Ground is constant as well as Load Resistor value. When Ic increase as there is Load Resistor but Vcc is constant and Ic = (Vcc-Vc)/RL (Load Resistor) then Vc must decrease and vice versa. The transistor formed in the former case will be NPN transistor and that formed in the latter case is PNP transistor. The question may look ridiculous since I'm not sure if the collector-emitter resistance exists or not.Īs I learn that when the Vb increase that will make Ib increase so Ic must increase too.
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