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仅用一片低耗四运放LM324另加少量外围元件,即可制成简易可靠的水位显示器。原理图见图1所示。四运放LM324由12V直流电源供电,不必稳压。四个同相输入端3、5、10和12脚并接在一起,且由稳压二极管V1将其电压稳定于+5V。四个反相输入端2、6、9和13脚,分别经电阻R4～R1接于+12V电源上;同时,2、6、9和13脚还分别与固定于水箱由低至高的四个金属片a～d相联通。四个输出端1、7、8、14脚分别经电阻R9～R6和发光二
Only a low consumption of four LM324 op amp plus a small amount of external components, can be made simple and reliable water level display. Schematic diagram shown in Figure 1. The LM324 quad op amp is powered by a 12V DC supply and does not have to be regulated. The four non-inverting inputs 3, 5, 10 and 12 are connected together and stabilized by a Zener diode V1 at + 5V. The four inverting input terminals 2, 6, 9 and 13 are respectively connected to the + 12V power supply via resistors R4 ~ R1. At the same time, the 2, 6, 9 and 13 pins are respectively connected with four low- Metal pieces a ~ d connected. The four output terminals 1, 7, 8 and 14 are respectively connected with resistors R9 ~ R6 and emit two lights