The voltage gain of an amplifier is given by A voltage amplifier is designed to achieve maximum voltage amplification. The function of a voltage amplifier is to raise the voltage level of the signal. Let us try to differentiate between voltage and power amplifier. Difference between Voltage and Power Amplifiers So, let us now try to get into the details to understand the differences between a voltage amplifier and a power amplifier. Hence there is a lot of difference in voltage amplification and power amplification.

The emitter and base regions of a power transistor are heavily doped.ĭue to the low input resistance, it requires low input power. The collector region of the transistor is made large and a heat sink is placed at the collector-base junction in order to minimize heat generated. It is larger in size, in order to handle large powers. A transistor that is manufactured to suit the purpose of power amplification is called as a Power transistor.Ī Power transistor differs from the other transistors, in the following factors. The DC power is distributed according to the relation,ĭC power input = AC power output + losses Power Transistorįor such Power amplification, a normal transistor would not do.

Besides raising the power level, it can also be said that a power amplifier is a device which converts DC power to AC power and whose action is controlled by the input signal. While the voltage amplifier raises the voltage level of the signal, the power amplifier raises the power level of the signal. This is clearly shown in the below figure.

Power AmplifierĪfter the audio signal is converted into electrical signal, it has several voltage amplifications done, after which the power amplification of the amplified signal is done just before the loud speaker stage. If we consider audio amplification, it has several stages of amplification, depending upon our requirement. In practice, any amplifier consists of few stages of amplification. Emitter Follower & Darlington Amplifier.Transformer Coupled Class A Power Amplifier.

Power amplifier for speakers