Simple 50W high-quality power amplifier 02

The power amplifier introduced in this article uses only more than 20 component circuits (one for left and right channels), as shown in Figure 6-9. Its
voltage push (excitation) part is composed of the integrated circuit FtPC 1225H and a small number of peripheral components. The final power amplifier pairing tubes
VTZ and VT3 are current amplification outputs. The internal structure of tuPC1225H is shown in Figure 6-10. The main electrical parameters are shown in the table 6-1 Institute
No. The main features are as follows:
    (1) The internal circuit functions of VPC1255H are well set up, and it has the advantages of simple circuit, low cost, easy installation and adjustment, reliability and safety
.
    (2) The circuit frequency band is extremely wide, f≥900kHz (±3dB) 6
    (3) High conversion rate, SR≥15V/ys o
    (4) Distortion ≤0.002", f-lkHz, Ri. -8n, Ui, - 14Vo
    (5) The power supply does not need voltage stabilization.
(6) The output voltage is high and the excitation capacity is large.