ICL7107 / ICL7106 - DIGITAL LED AMMETER (Ampere Meter)


  Part's List:

0.01 Ohm - 1.5mm / 5cm long copper wire
0.1 Ohm - 5W Resistor
1 Ohm - 5W Resistor

1x - 220 Ohm Resistor
1x - 10K Resistor
1x - 15K Resistor
1x - 47K Resistor
1x - 100K 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:
10A - 100mA Resolution - 99.9 A
5A - 10mA Resolution - 9.99 A
2A - 1mA Resolution - 1.999
A




About this Circuit

 

Ammeter is a great addition to any Laboratory Power Supply as it will measure the current consumption and help you determine if there are any problems with the circuit that you are building or testing. This amper meter is capable of measuring the current consumption up to 10A with selected 100mA, 10mA and 1mA accuracy, and consumes only about 25mA of current. The ammeter is based on single ICL7107 chip and 3.5-digit seven segment LED display. Due to a relatively small number of components that the circuit is using it is possible to fit it on a small 3cm x 7cm printed circuit board.



Construction Notes
 

0.01 Ohm resistor should be made out of 1.5mm thick / 5cm long copper wire. 0.1 Ohm and 1 Ohm resistors should have 5W ratings.

For highest accuracy it is recommended that the ICL7107 ampere meter module should be supplied with its own voltage supply. If measurement of the current of the same supply is needed, ICL7107 ampere meter would have to sample negative not positive voltage supply.

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

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

Dot on the seven segment LED display can be also moved with addition of a dual switch as shown below.

10A - 100mA Resolution - 99.9 A
5A - 10mA Resolution - 9.99 A
2A - 1mA Resolution - 1.999
A










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

 










Prototype Images

 










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This 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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