Practical circuit using STK3048 and STK6153 This article introduces a power amplifier thick film integrated circuit STK3048 and STK6153, the sound quality of the playback is impressive, the cost performance is extremely high, especially suitable for beginners and friends who prefer to set up a successful production. [Circuit principle] Figure 3-38 is a circuit diagram of using STK3048 to push the power tube 2N3055 and MJ2955. The circuit is so simple that there can be no more components. R1 and R2 can be used directly on the finished board. If the tube is not hot after being energized; if there is no other abnormality, you can adjust the RP without load, so that the voltage drop on R1 and R2 is 10 ~ 13mV, so that the quiescent current of VT1 and VT2 is 40 ~ 50mA, working in Class A and B. When soldering, the decoupling capacitor and pin (8) of the integrated circuit can be soldered together, and the other input “ground†terminals are connected here. If the midpoint voltage is greater than 10mV, it can be connected to the servo circuit (this article actually measured 30mV). After adjustment, the speaker can be connected to work. When I auditioned, I felt no worse than some mid-range aircraft. (2) Push STK6153 with LF353 No debugging is required for this circuit. During the audition, I felt that the treble sound was surprisingly bright, and even felt a little exaggerated, but it was very transparent, without any reluctance. The subjective evaluation is clearer than that of the LM3886 of TDA1514, the bounce and texture of the bass are also quite strong, and the listening feeling is very good. |
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