摘 要
繁华的大都市，忙碌的生活，人们在这种快节奏的生活中总会变得麻木疲倦，以至于总是会有一些人丢三拉四，忘记自己随手把东西放在哪了或是弄丢了。比如，人们常常会记不清手提包忘在哪里，或者把移动电话弄丢了，甚至是带孩子上街玩，一转眼孩子跑丢了；尤其是在客车，出租车，地铁，步行街等人口密集的场所发生贵重物品被盗或丢失的事件也越来越多，引起了人们越来越多的关注，所以各种电子防遗失产品应运而生，起到预先防止贵重物品被盗或丢失的作用，还可以防止孩子，宠物的丢失。有了它，就可以减少我们丢东西的概率。物体远离提醒器由无线发射器电路和无线接收提醒器电路两部分组成，采用无线电波的发射抑制原理，工作时发射机发出稳定的无线电波，接收机接收到主机的无线电信号后不报警，当发射机和接收机之间的距离超过预定的距离时接收机接收不到发射机的无线电信号，立即发出报警声，提醒使用者的注意。当无线接收提醒器与无线发射器之间的距离超过设定的距离时，无线接收提醒器就会发出报警声。该装置可用于箱包、钱包、文件夹等重要物品的防丢失报警，也可防止儿童游玩时走失。
关键词：提醒器；发射器；接收机；无线电波
Abstract
The bustling metropolis, busy life, people in the fast pace of life will become numb and tired that will always have some absent-minded, forget themselves readily to put the things in which or is lost. For example, people often will not remember her handbag, or where the lost mobile phone, and even took to the streets to play with children, a blink of an eye the child ran lost; especially in the bus, taxi, subway, walking street and other densely populated places occurred valuables stolen or lost events are more and more, causing the people more and more attention, so a variety of electronic anti lost products came into being, to forestall any valuables were stolen or lost, you can also prevent the child and pet loss. With it, we can reduce the probability of lost things. Objects away from the reminder by the wireless transmitter circuit, the wireless receive remind circuit composed of two parts, the radio emission suppression principle, working transmitter sends out the stability of radio waves, radio signals received by the receiver host does not alarm after, when the distance between the transmitter and the receiver exceeds a predetermined distance receiver cannot receive radio signal transmitter, immediately send out alarm sound, remind the user’s attention. When the distance between the wireless receiver and the wireless transmitter is more than the distance between the setting, the wireless receiving alarm will send out the alarm. This device can be used for luggage, wallet, folder and other important items of anti lost alarm, also can prevent the lost children.
Keywords: reminder; transmitter; receiver; radio waves
目 录
1.3 国内外相关研究情况………………………………….. 1
2 设计的基本要求与电路原理分析……………………………… 3
2.2.4 无线接收提醒器电路…………………………….. 4
3.2 NE555时基电路……………………………………… 8
3.2.1 555时基电路特点……………………………….. 8
3.2.2 555时基电路类型……………………………….. 9
3.2.3 555电路的功能介绍…………………………….. 10
3.3 TDA7000概述……………………………………… 12
3.3.3 TDA7000电路………………………………….. 13
3.4 KD9561电路的介绍………………………………….. 15
