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这个电路具有差动输出级和高阻抗结型场效应管输入级的优点.两只硅二极管对场效应管放大器的输入过载有粗略的保护作用.Tr_1和Tr_2同时工作为放大器和电平调节器,Tr_2的静态输出电压由R_1确定,近似为15V.缺点是这个电压也与放大器的增益有关.为此,预作几档可以作到准确的调整.Tr_3和Tr_4组成一差动放大器,能给出大约400V峰——峰电压输出.由220Ω发射极电阻得到反馈,R_2和C获得高频补偿.电阻R_3为Y轴位移调节.
This circuit has the advantages of a differential output stage and a high-impedance junction FET input stage. Two silicon diodes provide a rough protection of the input overload of a FET amplifier. Tr_1 and Tr_2 operate simultaneously as amplifiers and level regulators , The static output voltage of Tr_2 is determined by R_1 and is approximately 15 V. The disadvantage is that this voltage is also related to the gain of the amplifier.Therefore, pre-make a few files can be accurately adjusted.Tr_3 and Tr_4 form a differential amplifier, A peak-to-peak voltage output of about 400V is fed back by the 220Ω emitter resistor, and high frequency compensation is achieved for R_2 and C. Resistor R_3 is the Y-axis displacement adjustment.