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该延时电路的核心IC是由14位二进制串行计数器/分频器构成，IC内部由振荡器和14级分频器组成，振荡器部分可由电阻Rt和电容Cr构成振荡器，
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《QQ邮箱：2479261344@qq.com》产生固定的振荡频率,主振产生的矩形波可进入14级分频器，并通过10个输出端得到不同的分频系数（分频最小可得到16分频Q4，最大可得到16384分频Q14），便可得到所需的定时控制。待分频延时到达后，输出端的高电平使驱动电路三极管导通工作，从而使执行继电器工作，相应的延时触点对所需外围线路进行定时控制，IC振荡也随输出的高电平经V6使之停振。发光管V1也随继电器同时工作，起到延时到达指示。
集成的公共清零端Cr（12脚）在电路上电的同时由C4、R3组成的 微分电路上产生瞬间尖脉冲，使计数器的输出端复位清零，并同时使振荡停振。待上电瞬间结束后，振荡器开始振荡工作，电路即进入分频延时工作状态。
振荡器参数设置
振荡频率f 与RC有以下近似关系f=1/2.2Rt•Cr（Vdd=10V）。如考虑振荡器的稳定性，减少由于器件参数的差异而引起的振荡周期的变化Rs＞Rt（Rs=10Rt时，振荡周期基本上不随Vdd的变化而变化）为保证振荡能可靠起振。在选择Rt与Ct时应注意其条件，Rt＞1KΩ•Cr＞1000Pf，否则很难保证振荡电路可靠起振。
在实际使用的时间继电器，往往需要控制时间连续可调，为保证时间可调，则振荡回路Rt可选择线性较好X型可调电位器。延时电容可选择稳定性好的CBB聚丙烯电容，时间继电器标牌延时刻度可根据所选择的可调电位器机械行程的偏转角度来定，从而使设定时间值（标牌刻度示值）与实际延时值相吻合，以减少整定误差。
譬如要设置10s，可将Rt选择，1MΩ可调电位器，Ct可选择104 pF，输出分频端从15脚Q10引出，则最大
延时值为11S，因集成是在时钟脉冲下降沿的作用下作增量计数，则最大延时时间Tmax=2 n-1 • t= 2 10-1 •2•2• RtCt= 2 9 •2•2• 106×104×10-12 =11s。
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