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参考设计

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阴影报警器-----Shadow Alarm

dolphin 2012-11-22

这种光敏电路可以在有阴影落在它上面时发出告警信号。主要用于在深夜保护展柜里的贵重商品。展柜里需安装一只微光灯以便检测移动的阴影。 电路用9V电池供电。并使用最灵敏的光传感器L14F1来检测阴影。运放μA741(IC1)......

阴影 报警器 -----Shadow Alarm

门铃电路设计 Gate alarm circuit

dolphin 2011-07-18

门铃电路设计门铃电路Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-......

门铃 电路设计 alarm circuit

Touch-activated Alarm circuits

dolphin 2011-07-18

Touch-activated Alarm,Attach trigger wire to the latch nut/bolt Isolate this Latch from any other metal parts ......

Touch-activated Alarm circuits

Car anti theft wireless alarm.

dolphin 2009-08-25

This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system.......

theft wireless alarm.

Daylight Alarm

dolphin 2009-08-25

The circuit presented here wakes you up with a loud alarm at the break of the daylight. Once again the 555 tim......

Daylight Alarm

Water Level Indicator with alarm

dolphin 2009-08-25

This circuit not only indicates the amount of water present in the overhead tank but also gives an alarm when ......

Water Level Indicator alarm

Power supply failure alarm

dolphin 2009-08-25

Most of the power supply failure indicator circuits need a separate power supply for themselves. But the alarm......

Power supply failure alarm

Fire Alarm

dolphin 2009-08-25

. This circuit warns the user against fire accidents. It relies on the smoke that is produced in the event of ......

Alarm

Car anti theft wireless alarm.

dolphin 2009-08-25

This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system.......

theft wireless alarm.

Rain Alarm

dolphin 2009-08-25

This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used here w......

Alarm
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