Overview of the use of field-effect transistor amplifiers 2

Judgment of the Quality of Field Effect Transistors

First, use the MF10 multimeter R100K Ω (with a built-in 15V battery), connect the negative probe (black) to the gate (G), and the positive probe (red) to the source (S). Charging between the gate and source causes a slight deviation in the multimeter pointer. It is recommended to use the R1 Ω range of the multimeter, connect the negative probe to the drain (D) and the positive probe to the source (S). If the multimeter reading is a few ohms, it indicates that the field-effect transistors is good

Identification of commonly used field-effect transistor amplifiers

1. Field effect transistors have the advantages of high input impedance and low noise, and are therefore widely used in various electronic devices. Especially when using field-effect transistors as the input stage of the entire electronic device, it can achieve performance that is difficult for general transistors to achieve.

2. Field effect transistors are divided into two categories: junction type and insulated gate type, and their control principles are the same.

3. Comparison between Field Effect Transistors and transistors