Introduction to the power amplifier circuit assembled with TDA1521

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The power amplifier assembled with the TDA1521 is a high-quality power amplifier integrated circuit with internal overheating, short-circuit protection and speaker delay. Although the relevant newspapers and periodicals of this circuit have been introduced, their functions and effects have not achieved the intended purpose after the trial installation. To this end, the circuit has been designed and tested several times in the laboratory, and the instrument has been tested to make the power output, distortion rate, signal-to-noise ratio, dynamic range and high and low-boost indicators of the circuit reach a high level. . The improved circuit is shown in the figure. The improved TDA1521 amplifier is especially suitable for VCD, CD, cassette, tuner, karaoke and other signal inputs.
The preamplifier part of the circuit adopts the emperor's emperor NE5532, and the tone adjustment part selects NE4558. Reasonable selection of RC components in the bass circuit, through instrument monitoring, makes the 8Hz higher than the original design at 50Hz, with strong bass effect. Since the treble is attenuated when the volume is turned on, the LS function is added to the circuit to ensure balanced high and low output even at low volume. The circuit performance indicators of the machine are as follows: (1) When Uc=±24V, PMPO can reach 2 X 250W; (2) Frequency response: 20Hz ~ 20000Hz, 50Hz, the bass boost is the largest, up to 20dB; the treble boost is 18dB; (3) Distortion: ≤0.1%; (4) Signal-to-noise ratio: 70dB. When the machine is listening, the treble is bright, clear and clear. The bass is full and thick, and when the bass boost is maximum, it has the shock effect of heavy bass. When the volume is turned on, there is still a noticeable bass effect.