Question

Explain PNP & NPN transistor as Oscillator. Also write formula for Current gain & Volatage gain.​

Answer 1

Explanation:

• An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. ... NPN and PNP transistors have very similar schematic symbols. The only difference is the direction of the arrow on the emitter.
• An NPN Transistor has a DC base bias voltage, Vb of 10v and an input base resistor, Rb of 100kΩ. What will be the value of the base current into the transistor. Therefore, Ib = 93µA.
• hope it helps you

Answer 2

Answer:

• A PNP transistor has a layer of N-doped semiconductor among layers of P-doped material. In a PNP transistor, a tremendous voltage is given to the emitter terminal to produce current waft from the emitter to the collector, here the current flows from the emitter to the collector.
• An NPN transistor has a P-doped semiconductor layer among two N-doped layers. It gives a nice voltage to the collector terminal to provide a present-day float from the collector to the emitter. In this, the current flows from the collector to the emitter.

The formula of current gain & voltage gain:-

Current Gain, $\beta=\frac{I_{C}}{I_{B}}$  [where Ic is the current through collectors and Ib is the current through base]

Voltage Gain, $\beta\left(\frac{R_{\text {out }}}{R_{\text {in }}}\right)$  [where Rout is the resistance flowing out and Rin is the resistance flowing inside]

To learn more about PNP & NPN transistor and Current gain & Voltage gain,

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