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1.开机电路、电源电路及USB接口电路有的MP3设计有专门的开/关键,目前多数小贝贝都设计的是左右拨动型电源开/关键,有的还有一个“ON/OFF”开机键,所以单是小贝贝就有7键、6键、5键三种。它们的主要区别就在于“开机”键和“电源”键上,有些是将电源键和开机键合二为一,更有方案是将耳机电路与开机、电源电路合在一起,就是当用户插入耳机后,由耳塞的金属导通同时代替了电源开机键闭合的作用。
1. Power-on circuit, power circuit and USB interface circuit Some MP3 design has a special on / off key, the current design of the majority of small Beibei is about toggle power on / off key, and some have a “ON / OFF ”Power button, so there is a single small beibei 7 keys, 6 keys, 5 keys three. Their main difference lies in That is, when the user inserts the earphone, the earplug metal turns on and the power switch-on button is closed at the same time.