DIGITAL LED AMMETER

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 ammeter 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. More: 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.

The described ammeter circuit utilizes the ICL7107 integrated circuit, a versatile analog-to-digital converter (ADC) well-suited for low-power applications. The ICL7107 is configured to provide a digital readout of the current flowing through the circuit, displayed on a 3.5-digit seven-segment LED display, which allows for easy monitoring of current levels. The design supports a maximum current measurement of 10A, with selectable resolutions of 100mA, 10mA, and 1mA, making it suitable for various laboratory applications.

The circuit is designed with a minimal component count, facilitating its implementation on a compact printed circuit board measuring 3cm x 7cm. This compactness is advantageous for integration into existing laboratory power supplies or for standalone use. The use of a 0.01 Ohm shunt resistor made from 1.5mm thick copper wire measuring 5cm in length is critical for accurate current sensing. This resistor should have a low thermal coefficient to minimize errors caused by temperature variations.

Additionally, the circuit includes two other shunt resistors with values of 0.1 Ohm and 1 Ohm, both rated for 5W, which are essential for handling higher current loads without overheating. These resistors should be properly rated to ensure they can dissipate the power without failure during operation.

To achieve the highest accuracy in current measurement, it is recommended that the ICL7107 ammeter module is powered by a dedicated voltage supply. This ensures that the ADC operates within its optimal voltage range, reducing potential errors in the measurement due to fluctuations in power supply voltage.

Overall, this ammeter circuit design is an efficient solution for measuring current in laboratory settings, providing reliable performance with minimal complexity.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. 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. 🔗 External reference