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为了提高电路的可靠性 ,结合几个具体电路 ,从 4个方面简要阐述了抑制电路中的噪声和干扰的原理及实施办法。其中 ,使电位器的滑动接点远离放大器的输入端及尽可能将电位器用在大信号一侧的方法 ,能在一定程度上减小噪声电压对整个电路的影响 ;在继电器线圈两端并接高速放电二极管和 RC吸收电路能大大消弱继电器工作时线圈两端产生的负脉冲电压 ;用金属壳将高输入阻抗放大器的输入端屏蔽可消除各种外界干扰信号对放大器的干扰 ,而在高输入阻抗放大器的输入端接入隔离环可减少电源线漏电等对放大器的影响 ;在数字电路的终端连接终端电阻会明显改善数字电路中易出现的终端反射效应
In order to improve the reliability of the circuit, combined with several specific circuits, from four aspects briefly describes the noise suppression circuit and the principle of interference and implementation. Among them, make the sliding contact of the potentiometer away from the input end of the amplifier and use the potentiometer on the large signal side as much as possible, can reduce the influence of the noise voltage to the whole circuit to a certain extent; The discharge diode and the RC snubber circuit can greatly weaken the negative pulse voltage generated at both ends of the coil when the relay is working. Shielding the input end of the high input impedance amplifier with a metal shell can eliminate the interference of various external interference signals to the amplifier, Connecting the input end of the impedance amplifier to the isolation ring can reduce the amplifier’s influence on the power line such as the leakage of the power cord. Connecting the termination resistor in the terminal of the digital circuit can obviously improve the terminal reflection effect appearing in the digital circuit obviously