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用金属靠近模拟金属探测器的探头,探测器发出的声音信号音调就会变化,提示人们发现了“地雷”。电路原理电路图见附图。电路由金属探头、高频振荡器、频率比较器和音频输出电路组成。高频振荡器由4069电路和振荡回路组成;金属探头为一磁棒线圈,是振荡回路的线圈,当金属物靠近它时,就会改变线圈的电感量,从而导致高频振荡器的频率发声变化;频率比较器由4046电路组成,其内部有一固定频率振荡发
With a metal probe close to an analog metal detector, the tone of the sound signal from the detector changes, prompting people to find a “mine.” Circuit diagram shown in the drawings. The circuit consists of a metal probe, a high-frequency oscillator, a frequency comparator and an audio output circuit. High-frequency oscillator consists of 4069 circuit and the oscillation circuit; metal probe is a bar magnet coil is the coil of the oscillation circuit, when the metal object near it, it will change the coil inductance, resulting in the frequency of high-frequency oscillator sound Change; frequency comparator consists of 4046 circuit, which has a fixed frequency oscillation inside