Thus, a weak signal (0.1V) applied to the input circuit appears in the amplified form (10V) in the collector circuit.
When collector current flows through such a high resistance, it produces a large voltage drop across it. In the collector circuit, a load resistor R C of high value is connected. These are generally classified as audio amplifier (AF) or radio (RF. In this article, we will look at the most common and useful voltage amplifiers. This generally refers to voltage, but it could also be current, noise, or power. This change is almost the same in collector current because of the transmitter action. An amplifier is a circuit that takes an electronic signal at its input and produces a larger signal at its output. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. When a weak signal is applied to the input, a small change in signal voltage causes a change in emitter current (or we can say a change of 0.1V in signal voltage causes a change of 1mA in the emitter current) because the input circuit has very low resistance. A transistor acts as an amplifier by raising the strength of a weak signal. The DC voltage V EE keeps the emitter-base junction under the forward biased condition regardless of the polarity of the input signal and is known as a bias voltage. The DC voltage V EE is applied to the input circuit along with the input signal to achieve the amplification.
The input signal or weak signal is applied across the emitter base and the output is obtained to the load resistor R C which is connected in the collector circuit.
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