Practical circuit 01 using STK3048 and STK6153

(1) Use STK3048 to directly drive the complementary high-power tube.
    STK 3048 has high voltage and wide dynamic range.
The differential input tubes are accurately matched. Its common emitter terminal
and output collector terminal are both loaded with constant current sources,
so the distortion is low and the gain is high. Strong ability to suppress power supply ripple
9 Using STK3048 to drive high-power tubes not only
has superior performance, but also saves a lot of pairing and debugging,
making it simple and reliable.
    Figure 3-38 is a circuit diagram of using ST K30 48 to drive
the power tube 2N 305,5 and MJ2955. The circuit
is so simple that one more component, Rl and R2,
can be used directly on the finished board. After powering on, if
the tube is not hot and there are no other abnormalities, you can adjust RP without load so that the voltage drop on Rl and R2 is 10~13mV. In this way,
the quiescent current of VT1 and VTZ is 40~50mA, and they work in Class A and B status. When welding, the decoupling capacitor and the ninth
pin of the integrated circuit can be soldered together, and the other "ground" terminals are connected here. If the midpoint voltage is greater than 10mV, it can be connected to the servo circuit (
actually measured in this article is 30mV). After adjustment, the speaker can be connected to the working motherboard. When tested, it feels as good as some mid-range speakers.