Free test gallbladder high power amplifier circuit ----- Audio Power Amplifier

Exemption of gallbladder high power amplifier circuit, Audio Power Amplifier Keywords: exemption, courage, high power amplifier circuit DVP-free high power amplifier circuit The famous SGS-Thomson MIMs have launched a Hi-Fi high-power DMOS power amplifier circuit TDA7294. The sound quality is extremely gut, which is a field effect device from the input to output, and the sound is rounded. , Soft and delicate. However, with its assembled amplifier, only 70W of the single TDA7294 output power is only 70W, the BTL connection is also up and down, and it is always considered that the power remaining is not large. After several trials, the author uses the TDA7294 to promote the promotion level, directly drive 1? 4 pairs of high-power triodes in parallel, output strong current, output power up to 400W (mono), and the circuit is simple, no need to debug, you can work The sound and performance of the original IC is basically maintained. As shown in the lower left, R6 is a feedback resistor. The author is in debugging 22kΩ, and R6 also determines the gain of the circuit, the value large gain will increase. The power tube static current depends on R7, R8. When its value is below 10 kΩ, the circuit will be in a state, and the quiescent current can be adjusted to 100 mA? 2A, the author takes 30KΩ, the circuit operates in a class, fairly stable, the power tube is not loaded, and after 2/3 volume, the 10-inch speaker is pushed 10 minutes, and the power tube does not feel hot, and the sound quality is quite thick. At the time of test power to tubes T1 and T2, the author used A1943 / C5200, K1530 / J201, A1302 / C3281, where K1530 / J201 is preferably, particularly softly and sound. With the parameters in the figure, the output power is 200W, and when Working in Class B, it can satisfy its heat dissipation needs with a small heat sink (the author uses 14 cm × 5 cm × 3 cm). This circuit does not need to debug, one installs.

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