ولت متر دیجیتال بدون میکرو

[a.mehran]

This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The circuit employs the ADC (Analogue to Digital Converter) I.C. CL7107 made by INTERSIL. This IC incorporates in a 40 pin case all the circuitry necessary to convert an analogue signal to digital and can drive a series of four seven segment LED displays directly. The circuits built into the IC are an analogue to digital converter, a comparator, a clock, a decoder and a seven segment LED display driver. The circuit as it is described here can display any DC voltage in the range of 0-1999 Volts




http://www.electronics-lab.com/projects/...mage_3.jpg



انواع مقاومت برای انواع ولتاژ
0 - 2 V ............ R3 = 0 ohm 1%
0 - 20 V ........... R3 = 1.2 Kohm 1%
0 - 200 V .......... R3 = 12 Kohm 1%
0 - 2000 V ......... R3 = 120 Kohm 1%
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R1 = 180k

P1 = 20k trimmer multi turn

R2 = 22k

U1 = ICL 7107

R3 = 12k

LD1,2,3,4 = MAN 6960 common anode led displays

R4 = 1M



R5 = 470k



R6 = 560 Ohm







C1 = 100pF



C2, C6, C7 = 100nF



C3 = 47nF



C4 = 10nF


C5 = 220nF