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  Complementary Symmetry Amplifier

Introduction to Complementary Symmetry Amplifier

It acts like a direct coupled amplifier. It contains no transformer that is why it is termed as transformer-less audio amplifier.

A pair of transistors (PNP and NPN) is employed to eliminate the make use of transformer, in this stage. The two transistors' emitters are coupled. The input signals are provided to the bases of these transistors. A speaker is connected by a high value capacitor at the output of this amplifier. In +tive half of the input signal PNP transistor not conduct and NPN transistor conducts. In negative half of the input signal NPN transistor does not conduct and PNP transistor conducts. According to this way, both the transistors are operated like class-'B' amplifier. In the output, total output current is added together which drives the speaker. The audio signal converted by the speaker into sound.

ADVANTAGES

1. Transformers are not employed. So, it is not bulky and also cheap.

2. High output power

3. Distortions eliminated

4. Low power consumption

FM RADIO RECEIVER

It is receiver that receives the frequency modulated radio signals and regenerated the sound. It is as well a superhet receiver.

It contains the following stages expressed as follow:

1. RF amplifier

2. Mixer

3. Local oscillator

4. IF amplifier

5. Discriminator

6. Limiter

RF AMPLIFIER

It chooses the desired RF signals by the aerial. It amplifies the RF signals. It enhances the selectivity.

LOCAL OSCILLATOR

Local oscillator is a Hartley oscillator. It generates not modulated radio frequency signal. After that these signals are feed to the mixer.

MIXER

Mixer has get two signals that are RF signal and oscillator signal. It merges them and provides as output IF signal (10.7MFz).

IF AMPLIFIER

This is employed in among mixer and discriminator. It amplifies the IF signal and as well enhances the sensitivity.

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