Focus on the controller hardware system structure, Including signal regulate circuit, tripping control circuit and GPRS communication module circuit.

重点叙述了控制器的硬件系统构成，包括信号调理电路、脱扣控制电路和GPRS通信模块电路。

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Shares of Pandora dropped nearly 20% shortly before the closing bell, after tripping two circuit breakers in 10 minutes.

FORBES: Pandora Investors Singin' The Blues: Shares Plunge After Report Of Apple Radio in 2013