Name of the exercise: Emitter follower (Implementation of Voltage Series negative feedback)

Aim: Emitter follower (Implementation of Voltage Series negative feedback)

Material required:
1. MULTISIM Software Loaded PC 1 No.
2. Printer 1 No.

Description:
1. Theory
2. Symbol
3. Design Circuit
4. Simulation Procedure
5. Output Waveform

THEORY
Emitter follower circuit has a prominent place in feedback amplifiers. Emitter follower is a case of negative current feedback circuit. This is mostly used as a last stage amplifier in signal generator circuits.

DESIGN CIRCUIT

Frequency Settings:
Simulation Procedure:
• Open MULTISIM Software.
• Click=> New => Design1
• Click save as in Desk Top rename the Design1 to your circuit name.
• Go to Component tool bar and select the components.
• Draw the circuit diagram of Emitter follower circuit .
• Connect the CRO above mentioned circuit.
• Click simulate button or press F5 key => RUN
• Note down the Time period and calculate the frequencies.
• Record the output waveforms.

Result:
Thus the circuit is designed to simulate the VI characteristics Forward and Reverse Bias of Zener diode and the output graph is printed.

Video Tutorial:

To meet given amplifier specifications two or more stages are cascaded in series, each stage can be identical or different. Such amplifiers are called cascade amplifiers. Often amplifier with common emitter multi stages is referred to as Cascade amplifier.

2. What are the types of coupling used in amplifiers?
The term Coupling occurs in multi stage amplifiers and refers to the way in which the output of one stage is connected to the input of next stage. There are mainly three types of coupling which are
1. Transformer coupling
2. Capacitive coupling
3. DC coupling
4. Opto coupling

3. What is an amplifier?
An amplifier is a circuit, which can be used to increase the amplitude of the input current or voltage at the output by means of energy drawn from an external source.

4. Based on the transistor configuration how amplifiers are classified.
Based on transistor configuration, the amplifier are classified as
a. Common Emitter amplifier
b. Common Collector amplifier
c. Common Base amplifier.

All experiments should be designed and verified through simulation tools like Multisim.
1. Zener diode (Forward and Reverse bias characteristics)
2. Rectifier circuits ( Half wave, Full wave, Bridge rectifier with filters)
3. Power supply with Zener diode as Regulator
4. Common Base transistor output characteristics
5. Common emitter amplifier (Implementation of Current Series negative feedback)
6. Emitter follower (Implementation of Voltage Series negative feedback)
7. RC Coupled amplifier (Implementation of the concept of multistage amplifier)
8. Clippers and Clampers
9. RC Phase shift oscillator (Medium frequency Sine wave generators)
10. Hartley oscillator (High frequency Sine wave generator)
11. Astable Multivibrator (Square or Rectangular wave generator)
12. Gate triggering of SCR with various gate currents.