Digital DC Voltmeter based ICL7107 Chip

Mon, 11 Aug 2014 13:55:16 +0000

The values ??of the elements relating to the area 200mV and 2V range, the values ??are different only for R2, C2 and R7. The area subject to 200mV value written in the first msetu, or the same as a typical scheme. The area is subject to 2V value written elsewhere. For R7 is considered to be the area of ??200mV instead of resistor inserted jumper wire. Displays which are used as the total anode, and having 10 connectors used and may SA52-11GWA or similar color as desired.

It is clear that there are not only two measuring zones, but it is possible to extend the measurement area with the corresponding series resistor at the input of the voltmeter. I recommend that the full scale of 200mV use only for use as a voltmeter, ammeter, for all other applications prefer to use a range of 2V, this is to be extended to 20V or 200V range area.

Display 3 1/2 digit, which means that the maximum display 1999 course with a decimal point is included if desired. Decimal point is connected through a resistor R8 to ground. It is also not necessary to use 4 Display, you can use them only 3 to see 999 or range 100mV, 1V, 10V, 100V.

Input connectors AND HI and IN LO may not be connected to a voltage that is outside the power value ICL7107. The circuit is the typical applications also vary according to the input part, because it is at the entrance of two resistors that protect the entrance from destruction in case of connection too high a voltage.

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Here is the schematic diagram of digital DC voltmeter built based IC ICL7107. The power supply for this circuit is +5V. You may use 9V battery and then use regulator IC LM7805 to achieve 5V stabilized voltage. This circuit will be good to display your power supply output.

Components List:

R1 = 8K2
R2 = 47K / 470K
R3 = 100K
R4 = 2K
R5, R6 = 47K
R7 = 0R / 4K7
R8 = 560R
C1,C5, C6, C8, C9 = 100n
C2 = 470n / 47n
C3 = 220n
C4 = 100p
C7 = 10-22u
D1, D2 = 1N4148
IC1 = ICL7107
IC2 = NE555
OPTO = CA 10 pin

Top PCB Layout:

Top PCB Design Digital DC Voltmeter Circuit Electronic

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Bottom PCB Layout:

Bottom PCB Design Digital DC Voltmeter Circuit Top PCB Design Digital DC Voltmeter Circuit Electronic

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Constructed Circuit:

digital voltmeter circuit electronic

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This is the another DC voltmeter circuit design which show you about how to make reading scale. It is just need rotary switch and some resistors with different value at the input/measurement point.

Digital DC Voltmeter Circuit Electronic

" data-image-caption="" data-large-file="https://i0.wp.com/electronicscheme.net/wp-content/uploads/2014/08/Digital-DC-Voltmeter.gif?resize=630%2C380&ssl=1" class="aligncenter size-medium wp-image-2320" src="https://i0.wp.com/electronicscheme.net/wp-content/uploads/2014/08/Digital-DC-Voltmeter-300x198.gif?resize=300%2C198" alt="Digital DC Voltmeter" width="300" height="198" />

source: http://www.reber.si/dvm/index.htm

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ICL7107 | Electronic Schematic Diagram

Digital DC Voltmeter based ICL7107 Chip