| 摘要 |
<p>The electronic alarm system has a principal printed circuit on which are fixed connectors. Into these connectors are plugged subsidiary printed circuits on which are mounted the electronic components of the alarm circuit. Each circuit board is designed for an alarm function. A loudspeaker gives a modulated electronic round call. The electrical supply for the alarm system, incorporated in the housing, is a cadmium nickel 12V battery. A charger, is also included in one of the housing sections, which automatically charges the battery when the voltage falls. A rectifier bridge normally supplies the electronic circuits up to 400 mA, if this is exceeded the battery supplies the additional current.</p> |
