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shi yong dian zi mi ma suo
Author(s): 
Pages: 60
Year: Issue:  7
Journal: Family Electronics

Keyword:  报警电路 电路工作过程 电子密码锁 计数脉冲 报警声 信号 开关电路 开锁 驱动电磁铁 实用;
Abstract: <正> 本文介绍一种电路简单、工作可靠、新颖实用的电子密码锁,它由开锁电路和报警电路两部分组成。只有在顺序地按动4个开锁键时,锁才能被打开。否则在几次(次数自定)按错键后,就会在一定
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