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ELECTRICIAN - CITS

EXERCISE 66 : Use FET & MOSFET as an amplifier

Objectives

At the end of this exercise you shall be able to:
• construct FET amplifier circuit
• test FET amplifier circuit
• construct MOSFET amplifier circuit
• test MOSDFET amplifier circuit.

Requirements

Tools/Equipments/Instruments
• DC power supply 0-15V,1A -1 No. • Capacitor 0.01UF50v,
• FET 2N5951 -1 No. 1UF50v,10UF50v -1 No.
• MOSFET 2N7000 -1 No. • General purpose PCB -1 No.
• Resistor 1M,2.2K,1K,10K -1 No. • TRAINEE tool kit -1 No.
• Resistor 2.2K,10K,1K,100K -1 No. • Dual channel oscilloscope 20 MHZ -1 No.

Procedure
TASK 1: Construct FET Amplifier circuit

1 Assemble components in general purpose PCB as per Fig 1
2 Get the circuit assembly checked by instructor

Fig 1

TASK 2: Test FET amplifier circuit
1 Connect +12V dc power supply at their indicated position from external source.

2 Switch ON the power supply.
3 Apply signal of 100mV,1 khz to the source of FET
3 Observe the signal input and output wave form in CRO
4 Check Vs and Vd from plotted wave
5 Calculate gain Vd/Vs

6 Vary Vs for 1 more varied amplitude and repeat steps 4 to 6
8 Tabulate (Table 1) the readings and calculate voltage gain to verify the amplifying action of FET

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