Practical circuit diagram of STK3048 and STK6153
This article introduces a power amplifier thick film integrated circuit STK3048 and STK6153, its sound quality is impressive, cost-effective, especially suitable for beginners and favorite sets of successful production.
[Circuit principle]
1. Use STK3048 to directly push the complementary high-power tube STK3048 with high voltage and dynamic width. The differential input tube is matched accurately. The common emission terminal and the output collector terminal are all connected by constant current source, so the distortion is low and the gain is high. Ripple suppression is strong. Pushing the high-power tube with the STK3048 not only has superior performance but also saves a lot of pairing and debugging, which is simple and reliable.
Figure 3-38 shows the circuit diagram of the power tube 2N3055 and MJ2955 driven by STK3048. 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 power-on; there is no other abnormality to adjust the RP without load, so that the voltage drop on R1 and R2 is 10~13mV, so the quiescent current of VT1 and VT2 is 40~50mA, working in Class A and Class B. The decoupling capacitor can be soldered to the (8) pin of the integrated circuit during soldering, and the other "ground" terminals are connected to this. If the midpoint voltage is greater than 10mV, it can be connected to the servo circuit (this is measured to be 30mV). After adjusting, you can connect the speakers to work. I feel that it is not inferior to some mid-range machines when I listen.
2. The LF353 is used to promote the STK6153STK6153 with a fully complementary symmetrical structure, which has the advantages of high speed, low noise, high power, etc. The state is stable due to the internal constant current source bias. The exposed heat sink is electrically insulated from the internal circuit and is easy to use. The circuit is shown in Figure 3-39. The gain of the circuit can be adjusted by appropriately changing the resistance value. Small-capacity DC-blocking capacitors use high-quality CBB capacitors to improve sound quality.
This circuit does not require debugging. When I listened, I felt that the treble was surprisingly bright, and I even felt that it was a bit exaggerated, but it was very clear and not strong. The subjective price is better than that of the LM3886 of the TDA1514. The bounce and texture of the bass are also quite strong, and the listening is very good.
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