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This work by the pre-amplifier, band-stop networking, digital amplitude-frequency balanced and low-frequency power amplifier circuit consisting of digital amplitude-frequency balanced power amplifier. Overall program to LM386 for the core implementation preamp, A/D sampling, TMSC5402 DSP acquisition to the signal processing of the input signal is amplified by AIC23B, digital amplitude-frequency balanced last 2SC3281 The core signal of the low-frequency power amplifier.