音频电路
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
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