Draw the circuit of a transistor as an amplifier.

Draw a simple circuit of a CE transistor amplifier. Explain its working. Show that the voltage gain, A_V of the amplifier is given by A_v = - ( beta_(ac) R_L )/(r_i) where beta_(Ac) is the current gain, R_L is the load resistance and r_1 is the input resistance of the transistor. What is the significance of the negative sign in the expression for the voltage gain?

Discuss the working of n-p-n transistor as an amplifier in common base mode.

Discuss the working of p-n-p transistor as an amplifier in common emitter mode.

Fill in the blanks: For using a transistor as an amplifier, the base emitter junction is ……………. Biased and the base collector junction is …………… biased. (forward, reverse, forward, reverse)

Draw a circuit diagram for use of NPN trnasistor as an amplifier in common emitter configuration. The input resitance of transistor is 1000 Omega . On changing its base current by 10muA , the collector current is increased by 2mA. If the load resistance 5k Omega is used in the circuit, calculate the voltage gain of amplifier.

Does the operating points of a transistor amplifier shift with temperature?

Explain with diagram, the working of a transistor as a common-emitter amplifier.

What is an amplifier ? Draw a circuit diagram for an amplifier withPNP transistor in common emitter configuration. Also define current gain, voltage gain and power gain for it.