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本电路可用于婴儿尿布受湿报警。其受湿传感器几乎人人能自制,只要把两根相互隔开的裸铜线,并排布置在棉尿布下,受湿传感器就算作成了。如图1所示。图1中,VT2和变压器T绕组组成自耦变压器反馈式音频振荡器。振荡频率主要由变压器电感和电容器C2决定。调节电阻器R3则可改变反馈量,获得悦耳的声响。VT2是电子开关电流放大器。把受湿传感器如图1所示接到VT2的基极。RH干燥时,两裸铜线是绝缘的,所
This circuit can be used for baby diapers wet alarm. The wet sensor almost everyone can make their own, as long as the two separated from each other bare copper, side by side arranged in the cotton under the wet sensor even made. As shown in Figure 1. Figure 1, VT2 and transformer T winding autotransformer feedback audio oscillator. Oscillation frequency is mainly determined by the transformer inductance and capacitor C2. Adjust the resistor R3 can change the amount of feedback, access to sweet sound. VT2 is an electronic switch current amplifier. Connect the wet sensor to the base of VT2 as shown in Figure 1. RH dry, bare copper wire is insulated, the