本文介绍一种简单实用的CMOS金属探测器,使用元件均较小,调试也比较简单,抗干扰能力较强,而且还具有较高的灵敏度。 一、整机工作原理 整机工作原理如附图所示:由V_1、L、C_1、C_2和C_3构成一个振荡器,产生一个数千周等幅正弦波振荡。振荡线圈L套在运输皮带上。即运输皮带从线圈中通过,平时等幅正弦波经交流电压放大、整流滤波后所得到直流分量加在IC_2的反 This article describes a simple and practical CMOS metal detector, the use of components are smaller, debugging is relatively simple, strong anti-interference ability, but also has high sensitivity. First, the whole machine works The whole machine works as shown in the figure: V_1, L, C_1, C_2 and C_3 form an oscillator, resulting in a sine wave oscillation amplitude of thousands of weeks. Oscillating coil L on the transport belt. That the transport belt from the coil through, usually equal amplitude sine wave amplified by the AC voltage, the DC component of the rectifier filter is added to the anti-IC_2