Figure 1-1 is an example of a junction type FET 2SK125 (SONY) gate ground amplifier circuit. The electrode configuration of 2SK125 is the gate in the center, so when using it in the gate ground circuit, use the ground electrode of the gate on the printed copper foil Can separate input and output. The power gain of the circuit is about 10 to 12 dB, and the NF is about 2 dB. The value of LC in the circuit depends on the frequency, and the values ​​in Table 1-1 are used. L1 and L2 are polyamine wires with a diameter of about 0.3 mm on the toroidal core (Toroidal Core), which are directly inserted into the substrate In this way, there will be no stray capacitance, and installing 2 to 3 0.001μF bypass capacitors in the power path can make the circuit operation more stable. The place to be adjusted is the resistance value of the source, so that the leakage current is about 10mA. In addition, the trimmer capacitor (Trimmer Condenser) can be adjusted to achieve the best sensitivity, but the maximum gain point and the best point of NF value are not consistent , So it is usually the best point to adjust the NF value.
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The output voltage of thyristor phase-controlled rectifier circuit can be regulated in a large range and has a small fluctuation, which has an impact on the electrical performance of ac power and devices.
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