ICL7107 / ICL7106 - DIGITAL VOLTMETER
ICL7107 / ICL7106 -  Digital Voltmeter


  Part's List:

1x - 220 Ohm Resistor
1x - 10K Resistor
1x - 15K Resistor
1x - 47K Resistor
1x - 100K Resistor
1x - 1M Resistor
1x 10K Pot

1x - 100pF Capacitor
1x - 10n Capacitor
1x - 100n Capacitor
1x - 220n
Capacitor
1x - 470n Capacitor
2x - 10uF  Capacitor

3x - 1N4148 Diode
1x - ICL7107 IC
1x - 7660 IC
2x - MAN6910 2-digit LED 7-segment Display

  Technical Specifications:

Supply Voltage: 5V
Current Consumption: ~ 25mA

Measurement Accuracy:
199.9 V - 100mV Resolution


ICL7107 / ICL7106 Volt meter circuit

About this Circuit

 

This digital voltmeter is 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.

ICL7107 / ICL7106 volt meter circuit



Construction Notes

 

Brightness of the LED display segments can be varied by adding or removing 1N4148 small signal diodes that are connected in series. Use two 1N4148 diodes for higher LED display brightness.

The use of 7805 5V voltage regulator is highly recommended to prevent the damage of ICL7107, 7660 ICs and to extend the operating voltages.

220 Ohm resistor should be connected to the PIN 4 on the first LED display.

The voltmeter can also be configured to measure different voltage ranges and display higher voltage resolution. Replacing 1M with 100K resistor will allow to measure 0 - 19.99V voltages with 0.01V (10mV) accuracy.

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit



Calibration

 

Use 10K potentiometer to set the reference voltage between PIN 35 and PIN 36 of the ICL7107 IC to 1V.



Seven Segment LED Display

 
ICL7107 / ICL7106 volt meter circuit ICL7107 / ICL7106 volt meter circuit


ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit



Prototype Images

 
ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit

ICL7107 / ICL7106 volt meter circuit ICL7107 / ICL7106 volt meter circuit ICL7107 / ICL7106 volt meter circuit
ICL7107 / ICL7106 volt meter circuit ICL7107 / ICL7106 volt meter circuit
ICL7107 / ICL7106 volt meter circuit ICL7107 / ICL7106 volt meter circuit


PIC Volt Ampere Meter Kit

 

ICL7107 / ICL7106 volt ampere meter circuit

PIC Volt Ampere Meter was designed to measure output voltage of 0-70V or 0-500V with 100mV resolution and 0-10A or more current with 10mA resolution. It is a perfect addition to any DIY laboratory power supply, battery chargers and other electronic projects where voltage and current consumption must be monitored. Thanks to added calibration via SETUP, UP & DOWN buttons it is now possible to calibrate the meter to measure voltage that is higher than 70V and current that is greater than 10A. More Info ...


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