指标:
Frequency response: 20 Hz to 20 kHz +-1dB Noise level (A-weighted): -85 dBm Amplification: 35 dB 元件清单: R1 4.7 kohm R2 220 kohm R3 2.2 kohm R4 120 ohm C1..C4 10 uF 16V electrolytic C5 100 uF 16V electrolytic D1 Red LED Q1 BC547B (9013) SW1 on/off switch 600欧话筒平衡输入放大电路图:
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