In order to enhance the reliability of the auto electronic equipments, several kinds of self-protection circuits are designed to avoid the damage to the equipments by wrong operation or else.
为了提高车用电子设备的可靠性，设计了几种电子设备自保护电路，以避免由于操作失误或其它原因而导致的电子设备损坏。
When being in operation, the electronic radio receiver sends out cue signal if sound signal is not accorded with the condition of volume in order to make adjustment in time.
使用这种电子收音装置，可以在操作的同时，对不符合音量条件的声音信号发出提示信号，以便做出及时的调整。
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