Poor low frequency response

Higher cost

Needs a ripple free power supply

Insensitive to temperature changes

bias resistors

capacitive reactance

inductive reactance

transistor

low d.c. resistance and high impedance

low d.c. resistance and low impedance

high d.c. resistance and high impedance

high d.c. resistance and low impedance

its cost is high

it is bulky

it does not give a uniform frequency response over the entire a.f. range

all the above stated drawbacks

RC coupling

Impedance coupling

Transformer coupling

Direct coupling