Digital Multimeter Circuit Using Icl

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Meters & Detectors Mini Projects momename February 15, 2015 11

Electronic Test equipments, ICL7107

Digital multimeter circuit using ICL7107

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This is Digital multimeter circuit using ICL7107. We can modify the dc digital meter circuit to smart fullfunction multimeter, that versatile available. For example : measure DC voltage, ACV, DC Amp meter, ACAmp meter and as the Ohms meter etc.

Try to build this projects to use it really worth Fully enjoy

Special FeatureDC Voltage: 200mV, 2V, 20V, 200V, 2KV, 20KVAC Voltage: 200mV, 2V, 20V, 200V, 2KV, 20KVDC Amp: 200uA, 2mA, 20mA, 2A, 10AAC Amp: 200uA, 2mA, 20mA, 2A, 10AOhms meter: 200, 2K, 20K, 200K, 2M, 20M

DC voltage measurement

Figure 1 DC voltage measurement

In Figure 1 the schematic diagram of this project. Of course, the easiest way is used as the DC voltage metercircuit.

The characteristics of the circuit That can measure voltages up to 200mV. We can be applied to measurethe voltage range higher. As circuit is shown in table 1

Table 1 is shown in the resistance at various ranges.

Note: We may choose resistors in both formats. For the very high voltage measurement. It is necessary touse the external high voltage probe.

Note: R3=100K ; R4=10K

DC current measurement

Next take a look at the simple DC Ammeter circuit is Design appropriate determine the resistance in parallelwith the input of the digital meter only.

The principle to calculate the resistance is The voltage caused by the flow of current across the resistor ineach range is maximum up to 200mV as show in Figure 2

Figure 2 DC Ammeter circuit

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Page 1 of 6Digital multimeter circuit using ICL7107

3/12/2016http://www.eleccircuit.com/digital-multimeter-circuit-using-icl7107/



In Figure 2 is a circuit that is designed to have a range of up to 5 range. For the high current measurement 2Amperes, Should the input separately, because the contact of switch that can not withstand currents.

Diode D1, D2, overload protection is provided for the input.

Note: R2= 90 ohms, R3= 9 ohms

AC voltage measurement

We can design the AC voltage measurement circuit. By add the AC to DC converter circuit that has thetogether relationship as show in Figure 3.

Figure 3 the AC voltmeter circuit

The AC voltage is measured to reduce voltage same the DC voltmeter circuit. Then fed to the AC to DCconverter circuit by IC1 and accessories in Figure 3.

VR1 serves as a tune to the correct voltage reading.

AC current measurement

The same principle applies to the DC voltmeter circuit. We can be applied to the AC ammeter by adding theAC to DC converter before as show in Figure 4

Figure 4 AC current measurement

Ohms meteradvantaged that our digital meter better the regular meter. The reading was accurate, and can also be usedto measure the resistance of 0.1 ohms or less, such as high as 10M easily, by the circuit connection asshown in Figure 5.

Figure 5 the ohms meter circuit

Figure 6 the ICL7107 module

The digital meter module in Figure 1-5 We have shown for the legs of the circuit ICL7107. Compared to thelegs of the modules to Easy to write all the circuits. The ROH pin is the output reference voltage at middleleg of the horseshoe-shaped resistor

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Figure 7 the full circuit diagram of digital multimeter

In Figure 7 is a circuit work perfectly by show PCB layout and the components as show in Figure 8, whichcan be used to create a user-friendly way.

Figure 8 the pcb layout and components layout

Parts you will needs.IC1____TL071__Operational Amplifiers – Op Amps JFET Input Low NoiseIC5____LM7805____Standard Regulator 5 Volt 1 Amp 3 Pin 3+ Tab TO-220IC3____CD4049____CMOS Hex Inverting Buffer/ConverterIC2____CD4066___Quad Analog Switch/Multiplexer/DemultiplexerIC4____ICL7107 or ICL7106____Analog to Digital Converter Single Dual Slope 0.003k SPS 3 1/2 Digit LED 40-Pin PDIPLED 7 segment or LCD displayMore Switches please read in textResistors tolerance: 1%R1,R26__________________10M 0.5 wattsR2,R25,R30,R33,R36,R38___1M 0.5 wattsR3,R15,R24______________100K 0.5 wattsR4,R19,R20,R23___________10K 0.5 wattsR5,R22___________________1K 0.5 wattsR6______________________110 ohmsR7______________________1K 0.5 WattsR8_____________________100 ohms 0.5 watts

R9_____________________10 ohms 0.5 wattsR10____________________1 ohms 1 wattsR11,R12,R13,R14_________0.1 ohms 2 wattsR16____________________3.3K 0.5 wattsR17,R27________________2.2K 0.5 wattsR21____________________100 ohms 0.5 wattsR28____________________270 ohms 0.5 wattsR29____________________47K 0.5 wattsR32____________________ 5K 0.5 watts

MKT capacitorsC14______33pF 63VC15______330pF 63VC16______0.0039uF 63VC11______100pF 63VC10______0.1uF 63VC9______0.01uF 63VC8______0.47uF 63VC7______0.22uF 63V

Electrolytic capacitorsC5,C6_____470uF 16VC13________10uF 16V

DiodesD1-D4_____________________1N5408D7,D8,D9,D10_______________1N4001D5,D6,D11,D12,D13,D14,D15___1N4148

Switch see in circuit and PCB layout.

Note:





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MOMENAME

February 16, 2015 Salim Khan

Awesome, Thanks.

June 27, 2015 Ehsan

hi ,ex me can you explain more or upload a video i can’t understand thisfor example on part in schematic not join to another pars and if i right count , we most use 11switches so please to explain your diagram whit video thank u and ex me for my bad language

June 28, 2015 momename

Hi Ehsan,You can send me email.Thanks.

June 29, 2015 Ehsan

thanks for answermy email: [email protected]





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July 7, 2015 Ehsan

hi momename please send me a video from your project or a pdf file for more explorethx for your answers

September 2, 2015 khava

i need help with building the AC ammeter of 50 hz and i have to use leds to display my values

January 10, 2016 Alex

hello ,can you explain me more, i don´t understand the unions with the switches

Thanks

January 10, 2016 Alex

how many ic2 i need, and why one of them has pin 16?

February 4, 2016 jon

Hello, what model of LED display is used here? I am looking at the schematic and It is sayingLA601VA, but I cannot find any information on that model. Will something like the UN4043-13or LFD5221-20/A-PF work just as well? Thoughts?

February 29, 2016 belsin

sorry I need more detail about this please help me brother

February 29, 2016 belsin

sorry I need more detail about this please help me brother send pdf or video [email protected]

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Digital Multimeter Circuit Using Icl