100w pure class A power amplifier circuit

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Photocoupler

The circuit is a Class A DC power amplifier circuit with a fully symmetrical complementary push-pull output. The input stage uses a FET dual differential input circuit, which has the advantages of large dynamic range and low noise. However, due to the large inter-electrode capacitance of the FET, which affects the frequency response of the amplifier, in order to overcome its shortcomings, the differential circuit uses a common-co-base circuit, in which R3 to R6 are its biases. resistance. The use of a common source common-base circuit can improve the linearity of the amplifier and broaden the frequency response of the amplifier.

VTio and vrll form a single-ended push-pull voltage amplifier stage, and VT12 and VT13 are emitter output stages. They are used as impedance conversion to improve the load capacity. oVTg, VDi, VD and RPz form an output bias circuit, and RP2 can be used to adjust the output tube. Work in Class A work. VTI4~VT2i form four pairs of parallel push-pull power output stages. Parallelism is used to increase the output power, and the parallel logarithm can be reduced if high power is not required.

This circuit does not have large loop negative feedback, and uses local feedback (R31, ‰, C3) to improve circuit performance. r adjustment: Adjust RPi to the maximum resistance, 褂, to the minimum resistance. After the power is turned on, first adjust the RPi so that the voltage across the four load resistors of the differential input stage is 5, 4V, and then adjust the 静态 so that the quiescent current of the output stage of the power amplifier is 3 - 6A, and the output current of each output tube is The voltage is 160mV. It is kept for two hours and continuously measured until it is stable. The power amplifier tube can be equipped with high-power tubes with a withstand voltage greater than 100v, such as TP8N10 and TP8P10, 2N6338 phase 2N6437 and so on. VTi ~ VT4 select 2S75.2SK240, 6 ~ lOmA, NFlciBo VTs - VTg select 2SA1190, 2SC2855, 60V, 50mA, 130MHz, 0_4WoVTio ~ VTj3 select SA180.SC180, 120V, 100mA, 180MHz, 21IV.