Kamis, 03 Mei 2012

Digital Voltmeter for Power Supply

Circuit use intersil ICL7107, R3 value change scale, P1 adjust voltmeter


Components

R1 = 180k
R2 = 22k
R3 = 12k (see note)
R4 = 1M
R5 = 470k
R6 = 560
C1 = 100pF
C2 = 100nF
C3 = 47nF
C4 = 10nF
C5 = 220nF
P1 = 20k Trimpot
U1 = ICL 7107
LD1,2,3,4 = 7 segment Display comon An
Note- R3 ( voltmeter scale)

0-20 V ….R3 = 1.2K
0-200 V …R3 = 12K
0-2000 V ..R3 = 120K

Voltmeter PCB

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