This circuit is a circuit diagram? digital voltmeterwith
LED display. It’s ideal to use for measuring the output voltage of your
DC power supply. It includes a 3.5-digit LED display with a negative
voltage indicator. It measures DC voltages from 0 to 199.9V with a
resolution of 0.1V. The voltmeter is based on single ICL7107
chip and may be fitted on a small 3cm x 7cm printed circuit board. The
circuit should be supplied with a 5V voltage supply and consumes only
around 25mA. The use of 7805 5V voltage regulator is highly recommended
to prevent the damage of ICL7107, 555 ICs and to extend the operating
voltages. The following is a schematic drawing:
R1 = 8K2 R1 = 8K2
R2 = 47K / 470K R2 = 47k / 470K
R3 = 100K R3 = 100K
R4 = 2K R4 = 2K
R5, R6 = 47K R5, R6 = 47k
R7 = 0R / 4K7 R7 = 0R / 4K7
R8 = 560R R8 = 560R
C1,C5, C6, C8, C9 = 100n C1, C5, C6, C8, C9 = 100n
C2 = 470n / 47n C2 = 470n / 47n
C3 = 220n C3 = 220n
C4 = 100p C4 = 100p
C7 = 10-22u C7 = 10-22U
D1, D2 = 1N4148 D1, D2 = 1N4148
IC1 = ICL7107 IC1 = ICL7107
IC2 = NE555 IC2 = NE555
OPTO = CA 10 pin FTA = CA 10 pin
+ comments + 3 comments
In the part list there are some values with resistors and capacitors. for example R2 = 47K / 470K . Which values can I choose?
The resistor R2 470k
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