話筒放大電路圖一: 話筒放大電路圖二: 放筒放大器電路圖三: 簡單實用的放筒放大器電路圖四: 指標: Frequency response: 20 Hz to 20 kHz +-1dB Noise level (A-weighted): -85 dBm Amplification: 35 dB 元件清單: 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歐話筒平衡輸入放大電路圖: |