Electronics II and Lab JFETs

Electronics II and Lab

JFETs

INTRODUCTION

Which types of applications are field-effect transistors preferred over bipolar junction transistors? Why?

Explain why junction field-effect transistors are considered voltage-controlled devices.

EQUIPMENT

• 1 power supply: 15V
• 1 transistor: 2N4860
• 3 resistors: 1kΩ, 4.7kΩ, 2MΩ
• <List meters used>

PROCEDURE

Using Multisim construct the circuits shown below:

Measure the following and record the values in the “results” section: V_G, I_D, V_S, V_D, V_DS,

RESULTS

Calculate V_GS from the measured values.

Which type of biasing is used?

The table below shows readings for three different cases where the circuit above, was malfunctioning. Find the fault, assuming only one device in each case has a problem. List the steps taken to arrive at a solution.

CONCLUSION

What did you learn?