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该电路采用两个四以下（LM339）来照亮8显示音量LED串联电压比较器  1 LED = 22mW 2 LEDs = 42mW 3 LEDs = 90mW 4 LEDs = 175mW 5 LEDs = 320mW 6 LEDs = 650mW 7 LEDs = 1.2 Watts 8 LEDs = 2.5 watts |
LED的VU表电路
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